Fuel Mileage

[bigjake]

What are you guys getting on average for fuel mileage. I'm just wondering what the norm is. I've done some searching and didn't see a thread like this. let me know and if you want, tell us about your setup so we can get an idea of what we are getting into.

[madmule]

Took a desert trip weekend before last. Totaled 706 miles. Most of it on the hiway, about 150 off road. The overall mpg average was 8.5
YIKES! :confused:

We spent a lot of time talking about alternate fuels. i.e. Electric, solar, propane, nuclear, hijacking a UFO and modifying the drive mechanism to fit the Jeep. I need to do something.........

[MrFurious]

On the highway I average just over 16mpg. In town it drops down to about 12mpg.

[El Jefe]

lately ive been gettin 12 to 13.

[youngjeeper]

7 around town, 10 interstate..max speed, 55

[janie]

About 6 gallons per mile.:D

[musicman jeep 87]

I get about 9-10 in town and about 12-13 on the road. Interstate running I get "9". 65mph or 75mph doesn't mean anything, it's "9" period. Yes Woody will do 75mph. He really complaines at 80mph, so, I don't do 80mph. With my luck Woody would just shake apart at 80.

------------

87 GW gas hungry Woody

[Russianwolf]

Couldn't answer the poll...... I'm too scared to find out.

[Ristow]

about 12 overall,that was with the winter blend gas around here,and warm-ups.
i'll be in the 12-15 this summer again,with a 401 too.

[my88wgn]

well before the rebuild was about 8-10 mpg.after & it being bored .030 over.it gets 10-12 at best.I run 91 octane which is $3.01a gal.but it is 25 miles to the nearest station that carries 91 oct. :rolleyes:

[goldhammer]

I'm running about 12 1/4 back and forth to work (9 miles) and 14 1/2 on the highway at 65 and about 6500 lbs weight when we go on region campouts and projects. Around 9-10 when wheeling in high range, don't even want to think about low range mileage.

[GWChris]

In the winter with the choke on a lot, I'm getting 9 to 11 in mixed driving. With lots of hwy miles, it will do 12 to 14. Towing 5000lbs, it's in the 8's.

Towing is all I use it for anymore. Gas will never be cheaper than it is, and we will all likely have less money available to spend on gas anyway once the economy goes south. There's really nothing you can do to improve the mileage, so enjoy it while you can still afford to drive it.

If towing is one of your uses, at least soon there will be tons of newer tow vehicles on the market for fire-sale prices.

[BRUTUS]

Couldn't answer the poll...... I'm too scared to find out.

Exactly!

[CustomWag]

I'm back to 12.5. Was at 12.5 for the last year or so, then started dropping..11..10...9:eek: new plugs/cap/rotor and noticed fuel pump spewing:rolleyes: New fuel pump/oil/filter + trans fluid/filter change, now I'm back to where I was. 50 mile daily commute, combo 55/in town.

[82j20]

im anywhere 10-12 with my j20 360 4:10's got a prop system going on soon prop is half the price of gas here in canada

[86Wag]

When I picked up my Wag (nearly three years ago) I averaged about 11 on the trip home (NYC to Milwaukee). Haven't really driven it since, as it is waiting for a restoration.

[Tahnka]

3 years ago I averaged 16mpg mixed use. Now I'm averaging 10mpg mixed use (after $1500.00 worth of parts and labor to "fix" it). It used to tow a 1000 pounds at 70 mph averaging 12mpg.

[CowboyJeep]

I get about 15 mpg on the highway at just under 3000 rpm (72 mph).

[WGNMAN123]

DIFFERENT FOR DIFFERENT USAGE.
HIWAY - 13-14 MPG
TOWN - 9 -11 MPG
IN THE 40 ACRE WOODS - AS LITTLE AS 3MPG, OR AS MUCH AS 7 MPG, DEPENDING ON HOW WET, AND HOW MANY TIMES STUCK!!!

STOCK 360, NEW MC 2 BBL CARB, STOCK IGN/ALT/ETC IN '87 W/ D 44'S, NP229, TF-727

[DanHS]

I get about 14mpg regardless of what I'm doing, whether it's highway or in town. I expect it to go up to about 15-16 after fixing a few more things. I'd like 20 but that seems kind of out of the question. lol.

[CheapJeep]

Damm Dan, thats pretty good!!
I'm currently getting 0 mpg!
(No wheels on it!!)
Scott

[ibkukin]

I get 10-12 in town and 13-15 highway. I did the TFI upgrade and have the edelbrock performer carb and manifold set-up. Before the upgrades I got 8mpg no mater how I drove it.

[mechanical man]

I check the mileage every time I fillup-gas gauge has been broken for 6 months so I have to remember the last fillup mileage and know I can't go more than 200 miles before a fillup. With the summer gas the GW gets 10.3-10.6 mpg in mostly county hiway driving. Now factor in the 9% mistake due to the gearing/tire changes and that is 9.5- 9.7 mpg. With winter gas it drops to 9.7-10.0 mpg or 8.9-9.2 mpg with the odometer correction. It sure is fun to drive with the lower gearing though. We probably drive similer mileage each month month-the wife's XJ is using $200-250 a month and the GW is using $500-550 a month based on credit card records. It's starting to hurt 'cause trips to the pump are $50 now but then I remember that I haven't had a car note payment in the 13+ years of owning the GW.

[Louiseven]

Choke.....Did someone say they paid $3.01 for 91 octane? You cant by 87octane here for that.

[joe]

10-11 with the 72 J4000/360 4v/T18/D20/4.09 gears/33x9.5 tires. Same for the previous 73 J4000/360 4v/TH400/QT/4.09 gears/33x9.5 tires.
The 63 Wag/230 OHC/T90/D20/4.09 gears pulled off 15mpg's on the run home 350 miles over the Cascades with another 230 motor, spare flywheels, another head, clutches, valve covers, full windshield, boxes of misc parts etc in the back and after sitting non-run in the SE WA desert for 10 years. Got new tires, topped off fluids(and got some to go to). Arrived home getting 15 mpg but used/leaked/burnt at least a 6 pack prolly plus...
Good mpg's were prolly helped by the factor the front wheels where only lightly touching the ground during the trip. ;)

[Serious Johnson]

When the ol' gal ('83 wag) was stock and in fine fettle, she got 11-13 on careful highway runs, and 7-10 otherwise. The first time I took her up over timberline, she got a clogged cat & returned an all-time low of 1.8 (yeah, that's a decimal) MPG.

Since then, she's got a blueprinted, injected 360 with at least twice the original power, manual trans, part-time 4WD, 3.73 gears, 33" tires, 4" lift, etc., etc., and now gets 20 MPG if I try hard, and 15 or so if I smoke the tars now and then.

Of course, altitude makes a difference on a fuel-injected rig's mileage. I live at 8,200', and drive between 7 & 13,000'. At sea level, I'd be surprised to get over 17 MPG.

S.J

[brent]

I've done enough work in 3 yrs to GET TO 10-12 from 8-9.

ALL TIME BEST: w/help from the lord, gravity, and physics when I come off the mountain (Flag) to home (Phx) it's a 2 hour 7000 foot drop. I average 14 mpg which is wonderful.

With a minor rebuild/vavle job/valley and valve gaskets/repair mainifold leak/and other minor compression projects I'm sure 14 would be normal DD.
All summer projects.

Call me 10-12, Brent

[will e]

I am averaging 10.4 over several tanks of gas. (You can't really tell from 1 tank of gas due to the inaccuracy of the measurement of the fuel). That being said, I pulled 12.5 going to Tucson. Most of the time at 65mph and flat road. I did have a lot of weight in the truck since we were heading out camping.

Interesting side note: It would appear that I have just improved my milage. I have gone farther on this tank of gas than I would expect at the current gas reading. I won't know for sure for a couple of more days. I fixed an overheating problem so it will be interesting to see if that was impacting the gas milage (I have a closed loop fuel injection so the temp of the engine 'could' cause changes to the fuel consumption)

[Eugene 1]

I get about 9 to 10 in town as opposed to 6 to 7 i was getting when i first drove it back from Newbury Park,Ca.( in town) on the that trip back it got about 9-10 mpg at 70-75mph now with the full tune, i do not know ,but it should be better im hoping for 12-15 :D

[letank]

i was always above 13/17, even before the part time conversion, so this is w 3.08. Rpm are about 2100-2200 at 65 mph and 235/75 x15 road tires, 33-36psi

with the reformulated gas 10 or 12 years ago i went to 11/15

w some tuning, increased timing, i got back to 12/16

adding the TFI coil gave me back the 17+ , and 235/75x15 BFG, 34-36 psi

Gas is very important. With non california gas, like in Nevada, i can get a few tenth extra. Crossing Nevada on Hi50, keeping the throttle in the same position (not constant speed) i consistantly did 19.8 on 3 different occasions, about 8 refills.

dropping tire pressure to less than 30, will net a loss of 3 to 5 mpg

[WGNMAN123]

I QUESTION THOSE WHO SAY 'NO MATTER WHAT KIND OF DRIVING'...

I GUESS INDIANA MUD MUST DRINK MY GAS!!!

[475thFG]

I QUESTION THOSE WHO SAY 'NO MATTER WHAT KIND OF DRIVING'...

I GUESS INDIANA MUD MUST DRINK MY GAS!!!

I don't. I have a Dodge truck, 318, auto, that gets 10 mph whether I'm in town, on the highway, pulling 20,000 lbs, or empty and almost out of gas. Don't know why this is, but it's fact. If I need to take two vehicles to a job site and one of them is the Dodge, I'll load the second on a trailor rather than drive it, and get two there for the same price.

[mechanical man]

H*##, I question anyone with a 360 getting better than 10mpg on one of these dinosaurs!!!??? EFI can't break the laws of physics. A heavy brick takes energy to accelerate and pull up hill.

[GWChris]

EFI? MC2150 baby! FWIW, I have yet to see a late model FSJ that did not have a failed vacuum or emissions device. CTO, evap canister purge valve diaphram, PV, whatever. It makes it really tough to get any mpgs that way.

[GrayGhost]

I just got back from camping this weekend, pulling the camper (26 feet) I was getting about 6. It's getting to where I can't afford to go!:mad:

[Topher]

13.5 this past week-3 weeks out of the junkyard! Just changed the oil this past weekend, so we'll see how it goes this week. The 83 w/258 got 15 consistantly, and that's what I'm shooting for w/360. That's on 235/75r15 Firestone FR360 tires@38 psi, and running BP 89octane.

[710 Burner]

You mean your'e dreaming of 20.

[Don S]

..
mechanical man;


... Chuck, let’s not totally underrate these great FSJ vehicles, I know you’re a good guy and probably a good mechanic. But you said you wanted to question someone getting better fuel mileage from a 360.

... Remember I’ve been owning and tuning cars with carburetors for 56 years.
... The wife and I keep accurate mileage and fuel records and we check the accuracy of the odometers. My 401 gets 13+ at 55-60 and 12 at 70+.
... The wife’s 1981 Wagoneer, 360, MC-2150, TF-727 W/lockup converter, NP-208, stock gearing and twenty-nine inch tires got 16.5 mile per gallon.
This was on a trip of 1,000 miles between Chama NM and Ft.Worth TX. The trip included some high mountain passes, Cumbres, La Manga, LeVeta and Raton. Several of these passes are over 10,000 feet altitude.

“A heavy brick takes energy to accelerate and pull up hill.”

Yup!...:D But just watch these babies come down. The fuel mileage does not drop much with skillful driving in the real mountains.
... The problem with getting good fuel mileage is everything (and that’s a lot) must be right. If the mileage isn’t good then find which thing is wrong.

Have a good one and http://content.worldgroups.com/GRP002/GrpPhotos/F/FSJ_TECH_202/060414/002959000.GIF CUL.. Don S..

[rawdave]

I haven't checked my current wag as it is a work in progress. My previous wag got 17MPG with the only upgrade being a Jacobs ignition.

[Serious Johnson]

H*##, I question anyone with a 360 getting better than 10mpg on one of these dinosaurs!!!??? EFI can't break the laws of physics. A heavy brick takes energy to accelerate and pull up hill.

I'm sticking with my 20 MPG claim because I know it's accurate.

These rigs suffer lots of built-in inefficiencies. Prime among them is a '60s-tech slushbox with no lock-up torque converter, coupled to insanely tall gears to pass silly emissions standards of the day. Add to that penny-pinching Rube Goldberg solutions to try and drag an ancient design into the modern era using clueless new grads to replace the old engineers that commanded too much salary for a troubled company to keep, hacking-together off-the-shelf parts to replace the older, actually engineered stuf from the now bankrupt creating company, etc., etc., and it's a wonder that the **** things worked at all.

It's instructive to note that owners of older FSJs, less encumbered by the politico/corporate paradigm, seem to easily hit 13-17 MPG with no more extraordinary measures than just keeping the thing in tune. Their rigs present pretty-much the same profile to the wind as a '91 GW, and weigh less only by dearth of conveinince options, and maybe a bit of rust.

I had to think, work, and spend hard to get my ol' Wag, configured for dependable use in the very rough stuff above timberline where I live, to also return 20 MPG on the odd trip down to *&$%*$* Denver and not kill every flower it passed on the way.

I recently rented an '04 Toyota Sequoia, and was a bit surprised that it only just matched the ol' Wag in comfort, space, speed, and efficiency. And I'd a helluva lot rather bang the roof of the Jeep against a rock.

S.J.

[Holy Fender]

I assume you are running the 360 but the 258 I bought in Denver back in December, got an average of 20 mpg on the 840+ mile trip to Fort Worth. It had been sitting for at least 2 months and had a carter, original plug wires, numerous vacuum leaks and atleast one fowled plug. The PCV was so bad that the new air filter I put in it in Federal Heights, was soaked by Limon.

I havent gotten better than 17 since I got it down here and fixed all but the original ignition parts. I just want that 20mpg back. So that heavy beast can do it I am not sure exactly how. I'm thinking a low boost turbo.

[Lindel]

I drove the J-10 8 miles after the PO had just put a gallon of gas into it, after he discovered it was empty. I know it gets at least 8 miles to the gallon, maybe more! :D

[letank]

It's instructive to note that owners of older FSJs, less encumbered by the politico/corporate paradigm, seem to easily hit 13-17 MPG with no more extraordinary measures than just keeping the thing in tune.

I am almost to 15ish w the 85 Gwag project, 3.31 w 31x10.5. Now it is really leaking oil...... 1Q per 200 miles.... but it passed smog w flying colors, before i added the TFI coil..... 190,000 miles mostly original.




to also return 20 MPG on the odd trip down to *&$%*$* Denver and not kill every flower it passed on the way.

this is when connecting the distributor to manifold vacuum would help to have max advance



I recently rented an '04 Toyota Sequoia, and was a bit surprised that it only just matched the ol' Wag in comfort, space, speed, and efficiency. And I'd a helluva lot rather bang the roof of the Jeep against a rock.

agreed, almost went the toy route a few years ago, but realized that the mileage is not better, and the parts are $$$$

cheers

[JeeperJay]

I'm getting about 10mpg (mixed) out of my Wagon, with 33" tires and the 2.72 gears. The gearing is really terrible, but it hums right along on the highway! Unfortunately, I have to keep it over 70mph to make it up the hills and maintain cruising speed on the flats.

I was getting 6mpg for a while, with my worst at a 4.8mpg! The Motorcraft 2bbl was really screwed up and spitting raw fuel right out the pipe.

Mods include all emissions crap removed (by previous owner), no cat, no air pump. I plan on installing an electric fan to get rid of the parasitic loss from the mechanical fan. Oh yeah, I also installed the TFI upgrade, but barely noticed a difference.

[aatcman]

Hi,

I ENVY you guys getting 16MPG on the highway -- do ya'll have the 258 I6?

I've got an '86 GW with the 360 -- daily driver + tow vehicle +++++++++

Unloaded city traffic ==6-8 MPG
Unloaded highway = appx 12 mpg (I was getting 14 at one point -- not sure what I did to kill that though -- I think its the gas -- cheap s**t these days for 19x the price)

I will point out however, that I pulled an '86 oldsmobile custom cruiser station wagon (appx. 6000lb car) ON A TOWBAR with BOTH the jeep and the car loaded (helping my parents move) over and through the mountains from Detroit to Raleigh. Never went below 10 mpg (even going up hill at 60mph with my foot on the floor!! Show me an equivilant EFI vehicle that can do that!!)

This truck way more then makes up for its lack of MPG with an ABUNDANCE of POWER! It should also be noted that I normally run midgrade -- even hauling that wagon I didn't need premium.

Anyway, just my 2 cents (which won't even get you a drop of gas any more!) :o)

[Jeepjohnny]

Shoot, I'd have to correct my speedo-gear before I could tell the correct MPG.

[LYNCHMOB]

I get 7.5 in town and 9.5 on the highway. I do have a 4" lift and 35x12.50's. I would like to know what you all that are getting 12-14 mpg are doing? My goal is to get at least 12 mpg but the most I've ever gotten is 10.5, with a tail wind and going down hill both ways. If anyone has any suggestions, please email me at ryanlynch14@hotmail.com. I would appreciate it greatly, and so would my wife. :confused:

[mechanical man]

20 mpg from a 360 FSJ is ludicrus!!! I have two SB Chevy's, a SB Ford, and whatever the AMC 360 is (MB?). The best mileage I can get is with the 305 cu.in. Avanti-50K miles on the odo., Electronic Quadrajet, Corvette Ram horns, dual 2 1/4" exhaust, 200R4 tranny (0.76 OD in 4th) with 2.87 differential gears-this car is in near showroom condition. It weighs 1000 lbs less than a GW and the body is far more slippery than the Brick inspired GW (Andy Granatelli push one to 200 mph at Bonneville with a 304 cu. in. motor). The body's cross-sectional area (important for aerodynamic drag) is 1/2 of the GW. It gets 21 mpg on the highway and 16-18 around town. The 350 in the C-10 has a Quadrajet, Hedman Headers, dual 2 1/4 exhaust system, a TH350 backed up by a 2.76 rear. The engine, tranny, mechanical equipment is in really good condition-35K on a Target motor from Chev, and a freshly rebuilt TH 350. A vehicle far closer to the GW in weight and aerodynamics-it gets 14.4 mpg in around town driving-never really checked it on a trip (it rarely does those). The 306 Ford (.030 over 302) Bronco is all about off-roading and gas mileage isn't a concern.

My esperience says that 15-20 mpg (being really conservative) with a 360 GW is a dream. I don't see how a big cu. inch motor running a nearly closed throttle at cruise (where there is a hugh irreversibility in energy conversion in the heat cycle of the engine) can deliver any reasonable mileage.

[Carl Rasmussen]

13.5 HWY in the J10
350 TBI 4sp auto with 35's and 4.56 gears

[475thFG]

20 mpg from a 360 FSJ is ludicrus!!! I have two SB Chevy's, a SB Ford, and whatever the AMC 360 is (MB?). The best mileage I can get is with the 305 cu.in. Avanti-50K miles on the odo., Electronic Quadrajet, Corvette Ram horns, dual 2 1/4" exhaust, 200R4 tranny (0.76 OD in 4th) with 2.87 differential gears-this car is in near showroom condition. It weighs 1000 lbs less than a GW and the body is far more slippery than the Brick inspired GW (Andy Granatelli push one to 200 mph at Bonneville with a 304 cu. in. motor). The body's cross-sectional area (important for aerodynamic drag) is 1/2 of the GW. It gets 21 mpg on the highway and 16-18 around town. The 350 in the C-10 has a Quadrajet, Hedman Headers, dual 2 1/4 exhaust system, a TH350 backed up by a 2.76 rear. The engine, tranny, mechanical equipment is in really good condition-35K on a Target motor from Chev, and a freshly rebuilt TH 350. A vehicle far closer to the GW in weight and aerodynamics-it gets 14.4 mpg in around town driving-never really checked it on a trip (it rarely does those). The 306 Ford (.030 over 302) Bronco is all about off-roading and gas mileage isn't a concern.

My esperience says that 15-20 mpg (being really conservative) with a 360 GW is a dream. I don't see how a big cu. inch motor running a nearly closed throttle at cruise (where there is a hugh irreversibility in energy conversion in the heat cycle of the engine) can deliver any reasonable mileage.

It's possible to get close to 20 mph in a FSJ, maybe more (with the right gears), just highly unlikely anyone is going to go to the trouble to do what's necessary, and it would be somewhat counterproductive. If the single goal were to extend the range of the vehicle with a limited amount of fuel, it could be done, but not cost effectively, unless you have ready access to extremely high octane fuel (Av-gas, or Ethanol, either would work). You'd have to alter the fuel delivery system if you're going to use Ethanol, the entire engine would need a rebuild, you'd want probably 13/1 pistons if you were going to use Av-gas, even higher if you burn ethanol (it doesn't detonate), you'd need at the very least a rock-solid bottom end, and preferrably a forged crank, heavy duty rods, 7/16th rod bolts, and to top it off (literally), roller cam and rockers. With the much higher compression ratio you can get alot more out of whatever fuel you use, but the trade offs in cost isnt' worth it. At a guess, it'd run around $4k plus to build an engine like this (after machine work), and you wouldn't save noticably in fuel expense unless you were going to burn ethanol, and you were going to make it yourself. It's possible to, after the initial investment, make ethanol for under a buck a gallon (I'm going to do this myself in the next few months). But, if you can make it yourself for that cost, then there's no need to go to the expense of a big engine make-over, you just need to stuff bigger jets in your carb, make sure you have nothing that ethanol will disolve in your fuel system, bump the timing up a few degrees, and not worry about the further 10 to 15% reduction in mileage. I'm also considering converting my old Dodge to ethanol when I get operational and plumbing a turbo onto it in lieu of a total rebuild. I can increase efficiency slightly (make up for the 10 to 15% loss, maybe more) this way at far less cost, I think.

[Don S]

I get 7.5 in town and 9.5 on the highway. I do have a 4" lift and 35x12.50's. I would like to know what you all that are getting 12-14 mpg are doing? My goal is to get at least 12 mpg but the most I've ever gotten is 10.5, with a tail wind and going down hill both ways. If anyone has any suggestions, please email me at ryanlynch14@hotmail.com. I would appreciate it greatly, and so would my wife. :confused:
..
LYNCHMOB;

... Sent you a PM...

Have a good one and http://content.worldgroups.com/GRP002/GrpPhotos/F/FSJ_TECH_202/060414/002959000.GIF CUL.. Don S..

[Serious Johnson]

20 mpg from a 360 FSJ is ludicrus!!!....

Not really -- just dump the silly slushbox and you're almost there! The rest is just tuning.

S.J.

[475thFG]

I get 7.5 in town and 9.5 on the highway. I do have a 4" lift and 35x12.50's. I would like to know what you all that are getting 12-14 mpg are doing? My goal is to get at least 12 mpg but the most I've ever gotten is 10.5, with a tail wind and going down hill both ways. If anyone has any suggestions, please email me at ryanlynch14@hotmail.com. I would appreciate it greatly, and so would my wife. :confused:

I think most others don't have 35" tires on their rig. 12 to 14 is about average for a reasonably factory FSJ. Those big tires eat up alot of gasoline. I'd be surprised if you ever broke 10 without really featherfooting it.

[letank]

20 mpg from a 360 FSJ is ludicrus!!!

My esperience says that 15-20 mpg (being really conservative) with a 360 GW is a dream. I don't see how a big cu. inch motor running a nearly closed throttle at cruise (where there is a hugh irreversibility in energy conversion in the heat cycle of the engine) can deliver any reasonable mileage.

at stabilized rpm about 2150-2200 rpm or 65 mph, i get consistently 17+.... In fact the last 2 tanks, i got 18+ on hiway 5, going north from LA to SF. There was a slight side wind....

accross Nevada, a few years back i did on 3 crossings : 19.8.... almost took a detour on last trip to see if i can reach the 20

original 2100 rebuilt a few times.... no lift, so that could explain a lot..... 36 psi on tires BFG TA KO while on the hiway.....

[tem375]

Havent driven the fsj yet but in my baby jeep i get 9 mpg. It only has a four cylinder and has to work too hard to turn the 33s.

[Topher]

Hmm....in my 67 Charger 383/4spd/3.23:1 Suregrip I get 13+ on the highway. Of course I have to keep my foot from spontaneously finding the floor, but that's not too bad, I think. It's .030 over, .484 int, .508 exh/282/292 dur., 750 Carter stock exhaust manifolds through 2 1/2" pipes&turbo muffs, running on 245/60 15 tires on the rear.

[shredby4]

Mine is averaging better than 13 mpg now. Especially since I put a NEW gas tank in...No more leaking gas.

I've got a Q-Trac and 33X12.50's....

[Heep80]

mine I think is like ball park 8? need to get my carb/timing situation figured out. running 33's on my J-10. I think i have too much carb per engine.. got an eldobrock either 650 or 600.. high altitude here!

[shimniok]

Moab mileage was 9.9 mpg overall including on the trail, over 897 miles.

But I was getting 3-5mpg on the trail :eek:

On the hwy the average was actually 12.1 over 802 miles (there are lots of very tall mountains between me and Moab).

Max mileage recorded: 15.5 on the western slope coming back and filling up in Vail (with a new air cleaner...).

Haven't filled up since getting back but it's probably in the 11-12mpg
range.

Around town I've been getting 8-12.

It does worse when commuting on hilly C470, better when driving around under 55 on flat city roads with stoplights far apart.

Running Qjet, lift, 33's, roof rack, 4" lift.

I'm one of those people who obsessively keeps track of mileage for all his vehicles.

Michael

[mechanical man]

shimniok,
What's your axle ratio?

[shimniok]

Axle ratio is 3.73:1

[willysworker]

When the gas crunch hit in 19 and 74 and prices climbed to $ .60 a gal. I learned the two most common things guys liked to lie about where how much #*ssy and MPG they were getting. At 54 I will tell you honestly, I'm getting very little of either. With the age of my rides, that's just the way it is and that's all I've got to say about that.

[shredby4]

I think 20 mpg is certainly possible if somebody wants to spend the money to get it there. A properly built and tuned engine, correct tire pressure, synthetic lubricants, upgraded ignition, and a light touch on the skinny pedal....If I can average 13 or better from my weak motor, worn out slipping TH-400, and Motorcraft 4350...that should get somebody well into the 15 range. Now imagine an overdrive transmission... Could be a 5 speed manual or an automatic with a locking converter. Either way should be close to 20, if not over. If you got the money, fuel injection.... Would it be worth it? I doubt it. Even if you never hit 20 mpg you'd end up with a sweet clean running rig.

Now if you are one of those people that insist on running 70 or more all the time, there's probably no way.

By the way..."they" say tire pressure is the most overlooked factor when it comes to fuel economy.

Oh yeah...Since I replaced the tank, I seem to be getting around 15 or 16 mpg so far. :eek: Didn't know it was leaking that bad! Hopefully it will hold true and stay that high. I probably should add that I rarely break 60 mph...though I have ran it at 70....Didn't bother to see how much it took to top it off that day. But I can assume the economy and environment sufferd greatly on that day. ;) Except for Exxon. I'm sure my Jeep made them happy.

[bmearl4]

A hair shy of 14 on the J-10, 16 for the Sierra, and GW numbers N/A.

[PlumCrazyChris]

Serious Johnson, please let me know what your running. I was getting 17 when I drove my 83 Cherokee back from Chicago 2 years ago. Now with many, many upgrades, I'm down to 12 with my 258 and TBI.

These vehicles were rated at 12 mpg from the factory, so SJ if you can get it up to 20, please tell me how.

Thanks

[Serious Johnson]

Serious Johnson, please let me know what your running. I was getting 17 when I drove my 83 Cherokee back from Chicago 2 years ago. Now with many, many upgrades, I'm down to 12 with my 258 and TBI.

These vehicles were rated at 12 mpg from the factory, so SJ if you can get it up to 20, please tell me how.

Thanks

And 12 is about what mine got when it was stock -- except when it got 6. Right now, it's running a .030"-over 360 with about 9.25:1 compression, mild porting, Summit K8600 cam, Performer intake, GM TBI with full fuel & spark control, stock air box w/ K&N filter, very quiet single 3" exhaust, T-18a trans, NP-208 x-fer, 3.73 gears, 9.5x33" tires, 4" lift, etc., etc. Certainly my greatest gain came from getting rid of the slushbox, but the fact that almost all my driving occurs between 7,000 & 12,000' makes a difference as well.

S.J.

[War Wagon]

I am not worried about fuel mileage on the 82 I just picked up. I am more worried about quarts of oil per mile. :D


The War Wagon got 15.2 MPG on its last trip :eek: . I have just recurved the dizzy and went to manifold vacuum for the vacuum advance. I also have installed a A/F ratio meter and been tuning the Edelbrock 1406 carb. I just went richer on the low end to correct an off idle stumble. This corrected the stumble and improved the mileage as well. How you ask, will a richer set up increase mileage? By correcting the stumble I am no longer having to patt the go pedal several times to get going. That means that the accelerator pump only gives one shot instead of several every time I would pull off.

[Nick1224]

When hooking up the manifold vacuum, did you put any delays in line, or just a straight conection? I've heard some people say that they noticed better performance out of it. Thanks

[War Wagon]

Hooked the vacuum straight up to the port. Had to play with the timing some so it would not ping though. I did put a bushing on the mechanical advance stop to reduce it as well when I put in the lighter springs. I really need a dial back timing light to find out where I am at but as is she runs great.

Jim

[Holy Fender]

When hooking up the manifold vacuum, did you put any delays in line, or just a straight conection? I've heard some people say that they noticed better performance out of it. Thanks

On my Moto 2100, I went straight off the intake manifold port. It works great. Tuning is a must and I bet mine would get better if I would actually tune it with instruments, instead of just my ear.

[Jeepeta]

8-9 is my claim mixed city hwy right now. This before I do royal purp in the diff and transfer case, and get a fresh alignment. Found a split vacuum line last weekend that eventually ran to the EGR, so I am hoping that helps, but thus far it hasn't. Also had rear brake issue, so that is getting fixed too.

I wonder if anybody can comment on those lock-out hubs that BJ's is selling, if they really free up any mpg's too?

[War Wagon]

I wonder if anybody can comment on those lock-out hubs that BJ's is selling, if they really free up any mpg's too?

On The War Wagon we installed locking hubs and run the transfer case in E-drive (QT) and did not see any improvement. It did allow my son to have more fun playing in the mud and snow though. It all depends on what transfer case you have.


Jim

[JeepinPete]

One thing I hear all the time is that the upgrades to the drivetrain that will improve fuel mileage just aren't worth it dollar wise. In this day and age, if you can get a rig from 10 to 15 mpg, and drive 10k a year, you will save $1000 a year. More miles, better savings. That is one of the reasons I decided to swap in a newer drivetrain. I drive a lot more than 10k a year, so I figure it will take about two years to pay for itself...

[kel]

Hey all Jeep fanatics. There's an I6 in my old chero so it isn't quite a guzzler, but I am still researching ways to improve or eliminate MPG. This message isn't for those die hard skeptics whose Jeeps w/ 360s and up may do just that at say, $4/gal, $5/gal? No this is a post dedicated to those of us that wish to reduce dependence on foreign oil, or any delivered source of "energy."

I know this forum is chock full of sensible, utilitarian types, (hey it's a Jeep forum right?) but I wouldn't bring this up if it wasn't extremely important. I'm talking about joe cells.

http://www.joecell.com.au

When you read the description, you may not understand just how it works. Welcome to the club, not many, if any, people know how this thing works, but it does.

I'm not trying to sell anything, this is something that you build yourself, but again, it does work. I just wanted to tell fellow Jeep enthusiasts about this extraordinary device. If you don't want to try it out now, that's ok, but collect all the cheap stainless steel scrap (esp. tubing 2"-5" diameters) you can find and put it somewhere safe. Perhaps when gas is $6/gal you will be interested. :D

PM or reply if you would like to know more.

Thanks,
Kel

[Stuka]

Ok, 'charging engine coolant' will *NOT* make an engine run... your site there is a joke.

[kel]

Stuka your mind is made up I see, but I speak about this from experience. It is not a joke and you should try it out, works good as a booster. But maybe you will take it more seriously when gas prices are higher. :D

Kel

[mechanical man]

This is another clueless individual who thinks he can write the laws of physics the way he wants. Totally bogus!!!!

[Stuka]

A Joe Cell in itself is not what I am saying doesnt work. What I am saying is charging the coolant in your engine will do NOTHING to make the engine run any different. I dont care if you put a million volts through the thing, all you would succeed in doing is overheating the engine by super heating the coolant. The coolant in no way shape or form has anything to do with the engine rotating, how anybody could fall for this is laughable.

[numa]

That web site was one of the funniest things I have read in a while. ORGONE ACCUMULATOR??? Great Googley MoogleyGreat Googley MoogleyGreat Googley Moogley WOW, this is up there with the 'magnets in the shoes'. And makes the tornado-in-your-air-intake look tame. WOW. :D

[Serious Johnson]

That web site was one of the funniest things I have read in a while. ORGONE ACCUMULATOR??? Great Googley MoogleyGreat Googley MoogleyGreat Googley Moogley WOW, this is up there with the 'magnets in the shoes'. And makes the tornado-in-your-air-intake look tame. WOW. :D

From the web site in question:
"What is Orgone Energy It is a type of sexual life-force energy that can be gathered, beamed, absorbed, generated, or redirected by conscious beings or orgone-based devices."

What's so funny about that? Besides, I'm sure we could all benefit from those gravity nullifying effects! :D

S.J.

[475thFG]

A Joe Cell in itself is not what I am saying doesnt work. What I am saying is charging the coolant in your engine will do NOTHING to make the engine run any different. I dont care if you put a million volts through the thing, all you would succeed in doing is overheating the engine by super heating the coolant. The coolant in no way shape or form has anything to do with the engine rotating, how anybody could fall for this is laughable.


The reason people fall for it is because people, in general, are stupid and easy to talk into nearly anything. Natural selection has completely ceased to play a role in the evolution of the human race, and I believe we're actually regressing. Too many people that would ordinarily die on their own from sheer stupidity are allowed to survive, and even reproduce, polluting the genepool with stupidity and physical inferiority. What a wonderful thing civilization is.

[kel]

A Joe Cell in itself is not what I am saying doesnt work. What I am saying is charging the coolant in your engine will do NOTHING to make the engine run any different. I dont care if you put a million volts through the thing, all you would succeed in doing is overheating the engine by super heating the coolant. The coolant in no way shape or form has anything to do with the engine rotating, how anybody could fall for this is laughable.
There is a lot of negativity in here, I expected it, and it is here. Perhaps you aren't seeing the whole picture. The charging, as referred to by the experimenter's manual (had you read the whole thing) does not mean placing a potential through the coolant. They are referring to allowing the cell itself to "charge up" (whatever that is) the whole engine itself, coolant may play a role. Currently I am trying to make sense of this whole orgone thing, I am beginning to think it has a lot to do with hydrogen, since hydrogen is such an instrumental part of life. Think H2O.

The responses so far are what can be expected for a totally new technology in its infancy. The good thing about this in particular is that it is "open source." Many people are working on it around the globe, cooperating, trying to understand this in a way that can satisfy academia.

I know there is a heckuva lot of talent in this forum, you guys wrench with the best of em. My original post was just trying to get the word out, maybe someone that is even more mechanically-minded than me could whip one up, and help contribute to the effort.

BTW the "laws of physics" were written over 200 years ago by long-haired hippy dudes sitting under trees. Not to say they aren't valid, but due for a revision.:cool:

Thanks for reading, and please don't call me stupid :D,
Kel

[475thFG]

<GREAT big snip>........
BTW the "laws of physics" were written over 200 years ago by long-haired hippy dudes sitting under trees. Not to say they aren't valid, but due for a revision.

Thanks for reading, and please don't call me stupid ,
Kel


No, the laws of physics were "written" at the formation of this particular universe by whatever divine being (nothing this intricate and delicately balanced cannot possibly be an accident) is in charge of the whole she-bang (pardon the pun). Those "hippy dudes", as you put it, simply discovered a few of the particulars that apply to aforementioned physics. And quantum physics is just a fancy way of saying "The answer is both wrong and right at the same time, and therefore even if I'm wrong, I'm right".

[kel]

No, the laws of physics were "written" at the formation of this particular universe by whatever divine being (nothing this intricate and delicately balanced cannot possibly be an accident) is in charge of the whole she-bang (pardon the pun). Those "hippy dudes", as you put it, simply discovered a few of the particulars that apply to aforementioned physics. And quantum physics is just a fancy way of saying "The answer is both wrong and right at the same time, and therefore even if I'm wrong, I'm right".

Good reply 475, I agree BTW, but I don't think that we can bind the book of scientific knowledge and there are bound to be some corrections needed (not up to me of course :D ). It seems like you are saying that the laws are like the word of god. When interpreted by man, are the meanings kept intact?
You are referring to the wave-particle duality? So they are both wrong and right since when they look for a wave, it is there, and when they look for a particle, there it is?

Check out this scientific explanation of the JC, just found it:

http://www.thejoecell.com/

Later,
Kel

[shimniok]

Good reply 475, I agree BTW, but I don't think that we can bind the book of scientific knowledge and there are bound to be some corrections needed (not up to me of course :D ). It seems like you are saying that the laws are like the word of god. When interpreted by man, are the meanings kept intact?

Scientists and mathematicians have been modelling the universe's laws in ever more sophisticated and accurate ways, from Newton (http://en.wikipedia.org/wiki/Isaac_Newton) and Newtonian mechanics (http://en.wikipedia.org/wiki/Newtonian_mechanics) to Einstein and his Special Relativity (http://en.wikipedia.org/wiki/Special_Relativity) and General Relativity (http://en.wikipedia.org/wiki/General_Relativity) (both branches of classical mechanics (http://en.wikipedia.org/wiki/Classical_mechanics)) to quantum mechanics (http://en.wikipedia.org/wiki/Quantum_mechanics). These and loads of other scientists in between, before, after, have used the Scientific Method (http://en.wikipedia.org/wiki/Scientific_method) to further refine humankind's ability to understand and model the universe.

So, our understanding of the universe is already constantly being revised.

Just as a person knowledgeable in art will be able to instantly, in one glance, detect an obvious counterfeit painting or sculpture (and even explain the telltale giveaways), so too will a person with a science or engineering background be able to detect an obvious pseudo-science (http://en.wikipedia.org/wiki/Pseudo-science) hoax (http://en.wikipedia.org/wiki/Hoax) and explain the telltale giveaways (like, orgone energy, or the notion that capacitors (http://en.wikipedia.org/wiki/Capacitor) can create energy, or the idea that static electricity (http://en.wikipedia.org/wiki/Static_electricity#.27Static.27_electricity) carries enough energy to power anything at all).

All is not lost for those less steeped in science and math. Fortunately, there is also the wonderful tool of Critical Thinking (http://en.wikipedia.org/wiki/Critical_thinking) to help you avoid being duped!

Now... if only I could find a Wikipedia article on how to avoid falling for and replying to obvious bait like this I'd be set. :D

Michael

[silvrwgnlvr]

Couldn't answer the poll...... I'm too scared to find out.

With her already running out of gas twice now I am not sure. Gas gauge doesn't work right. I wanted to fill it completely write down mileage, and drive till she ran out of gas again, but hubby won't let me.:rolleyes: Where is the fun in that.:p It is too hot out here for me to be running around with an extra thing of fuel just in case, or so he says:cool: I think he just doesn't want to get called to rescue me and the kids.:D

Besides I'm a little scared to know the truth! Ignorance is bliss

[Don S]

With her already running out of gas twice now I am not sure. Gas gauge doesn't work right. I wanted to fill it completely write down mileage, and drive till she ran out of gas again, but hubby won't let me.:rolleyes: Where is the fun in that.:p It is too hot out here for me to be running around with an extra thing of fuel just in case, or so he says:cool: I think he just doesn't want to get called to rescue me and the kids.:D

Besides I'm a little scared to know the truth! Ignorance is bliss
..
silvrwgnlvr;

... You are too far away for me to come to the rescue so here is another solution. In the PIC below the red fuel can is plumbed into the fuel line and is controlled by a switch. It sure is handy.


http://www.fullsizejeeps.com/jeeps/files/1963-1983-Wagoneers/Lelvouray.jpg

Have a good one and http://content.worldgroups.com/GRP002/GrpPhotos/F/FSJ_TECH_202/060414/002959000.GIF CUL.. Don S..

[ohioj20]

Are diesel FSJ allowed to do the poll?? Might scew the results! ;)

[brent]

Kel:” BTW the "laws of physics" were written over 200 years ago by long-haired hippy dudes sitting under trees. Not to say they aren't valid, but due for a revision.



475th: “And quantum physics is just a fancy way of saying "The answer is both wrong and right at the same time, and therefore even if I'm wrong, I'm right".


To Kel I'd say Stuka is a smart and good-humored gent who never--in my short stay--has ever called names. It's the wrong attitude for you to say "I expected negativity." IFSJA doesn't work that way. To quote a long-haired hippie Bob Dylan "we all feel the same way/we just see it from a different point of view." I believe that.
But I DO really dig your point of history/science needing to be reviewed/re-tested.. People forget Nietzcshe, for all his flaws, was adamant and against hanging our hats on scientific theory that is hundreds of years old. I believe in this logic as well. I love paradigm shifts--keeps the world turning. I say there a very few constants, but there are constants.

475th: You refer to Irwin Shrodinger's cat this is blasted into space and half dead and half alive. Half your statement is true, the second half is not that I can see. Quantum physics has its speculatory leaps, but I've not known it to be so smug to exhibit an "I'm always right" flavor..Schrodinger used to p*ss off Einstein because he would dare NOT to speculate about 50/50 percentages. (prompting the famous Einstein quote: "God doesn't play dice with the universe.") Quantum physics gets us to understand the unlimited amount of intangibles involved in guessing, not declare them true. But even this theory has been replaced (paradigm) with the more difficult-but-currently-"in" String Theory which is a tough one for anybody to wrap their brains around.

Anyway, gents, you were tossing around the philosophy/science ball and I was compelled to take the bait. 2cents, Brent

[Kali]

With a tired 258, the infamous carter carb, and a good oil leak the best I did with my j-10 with a mix of highway and city/town driving was 14.2 mpg. The combination of 4.10 gears and 31" tires was pushing my engine to 3050 rpm at 65 mph, too. But, I can't honestly say this is my "average" mileage as I certainly was trying to set a fuel economy record and was very light on the gas pedal.

I'd like to think that with a new carb, 33" tires, HEI ignition, and a little tuning I could have my tired 258 into the 16-18 range for highway trips.

[79_Limited]

I quit looking. Too depressing.

[Eugene 1]

Im getting about 12-13 with the recent upgrades TFI-edelbrock manifold-=new plugs:thumbsup:

[J10-401]

"I drove the J-10 8 miles after the PO had just put a gallon of gas into it, after he discovered it was empty. I know it gets at least 8 miles to the gallon, maybe more! :D"


On the level? That's humor - sort of.

[J10-401]

"Datsun 1200 ute"

I'm glad his test vehicle was so carefully chosen. :rolleyes:

Snake Oil science always fascinates me. Does it cure warts and hair-loss too?

[AlsChopShop]

when it looks like this:
http://i15.photobucket.com/albums/a400/AlsChopShop/cherokee/IMG_3273.jpg
i'm paying more attention to the SMILES per gallon! :D:drivin:

Al

[autonut]

I'm was getting about 12 to 13 mpg. While changing plugs however I discovered the Wag was running quite rich. Because of fuel prices I decided to get the carb overhauled by Pony Carbs. After installing the carburetor the auto still didn't want to idle as it should. I finally gave up and took it to a shop. He finally found a vacuum leak close to the ERG valve. He had a devil of a time to find it and he even took the valve out but it was okay. I have apparently had this leak for quite some time without realizing it. It really idles great now and hoping my mileage will be possibly a little better? Howver my mileage wasn't that bad. The 12 to 13 was with mixed driving. I will let you know what I get after a few tanks. CHEERS/LEE:)

[Trevor Batten]

258, T5 tranny, NP208, Carter, standard wheels/ tyres, Jacobs electronics.. highway at 65 mph I get 18 mpg. Around town and when doing the hard yards - I do not measure it as it is too frightening!
Took me years to get the tuning right - kept fiddling with the timing and Carter until the exhaust burnt white not black!

[gump]

I get about 11.5 in two wheel and mabey 10 in four wheel

[Louiseven]

Wow..seriously 20mpg!! seriously!! I get 8mpg period. I only drive on the streets right now. Not comfy enough to put her on the FREEWAY. I have had new plugs,filters and fluids since March. Just had the Carb and timing adjusted. NO lift and standard tires 8mpg!!! What gives???

[ARMYMAN 30 YEARS +]

I was getting 15 - 17 with a way light foot and about 10 when smoking sports cars. With the 401 part-time with overdrive in the QT and lock out hubs the winch equipted Chief carries two five gallon jerry cans on the tailgate but usually they are only used when traveling through expensive fuel zones or to help out an out of gas motorist. Was thinking of a Joe Cell for my gun but my wife would probably complain about all the gas.:p

[cincyjeeprs]

Town 10-11
Mix town/highway 11-12

Window sticker said 11/13 back in the day.

[Louiseven]

I have installed new plugs,filters and fluids since March. Just had the Carb and timing adjusted.I also bought and installed a new high flow Catalytic converter. Almost all of the hoses have been replaced as well as the belts. New smog pump,AP valves, and hoses. NO lift and standard tires. I have the factory tow package so I am told the factory (towing) gears. My wagon runs really smooth and quiet except for the low rumble of the exhaust. It's a 19 year old vehicle with 184000 on the clock. Which is not too bad. I dont believe I can get 20mpg but 11 or 12mpg in the city would be a welcome improvement.

[xsonmyeyes]

7.25 right now but I think I still don't have all the bugs worked out..

[farna]

You guys were scaring me at first! I just bought a 258/four speed J-10, but with stock size tires (29"?) and gears (2.73 -- 1980 model). I won't be doing any serious wheeling -- I just bought it because I wanted a truck for some light hauling that could tow a trailer when needed. I'm an AMC fan and wanted an AMC (Jeep) truck if practical -- got lucky and found a pretty nice stock one.

A 1982 ad I have says it was rated 16/21. 82 may have had a T-5 though. I'll be quite happy with an average of 17-18, 16 won't be bad though. The EPA rating of 16 should be overall average with 21 the best with careful highway driving. I will be upgrading it later -- have an extra Renix EFI system from a 4.0L that I hope to eventually put on. It should have an electronic ignition already, might go ahead with the TFI upgrade.

[A Lung]

Heres another thought I dont know if anybody has brought this up but how any of you guys with low gas mileage are running full time fourwheel drive and how many are part time?

[N2Jeeps]

I see all kinds of posts with just about every engine/trans/xfer case possible.

To date the only real number I have see are from the diesel guys... Chevy 6.2 and 6.5 guys in the 20-22 range.

I know we can all argue aerodynamics all day... but it seems if my Suburban could squeeze out 17.5 then a GW with the same drive train/gears/tires and 1/2 a ton less weight should do about the same.

Since my drive train is pretty worn I even considered it but as everyone says you can buy a lot of gas for what the conversion costs.

Anyway, I was just curious what the guys with a full conversion were getting.


Just for an update..... after converting to a 5.7l Vortec and 4l60E I am averaging 16.6 mph. A little more if I take the weight off my right foot.

[Rainman]

Just got back from a 4900 mile road trip last weekend and averaged 12.3 mpg. Sacramento to Dallas going the long way through Utah and Colorado loaded down with lots of stuff. Best was 16.63 & worst was 9.26. Lots of mountain passes (highest was Monarch-11,312') that the GW didn't like. A carb tuned for sea level does not like 8% grades at 8k feet. The GW is not my daily driver so that's the best I can offer.

[bigblack'74]

'72 360 = 13 or 14 all around '84 258= 22 in town and 23.5 on highway both always consitent with 91 octane ONLY

[LouM]

If I was terribly concerned about fuel mileage, I wouldn't be driving a GW built when the national speed limit was 55mph with all the aerodynamics of a house. That said, here's my story...

84 GW 360/TF727/NP229/2.73:1: LT235/75R15 On/Off road tires @ 36psi, 3" Rough Country lift, B&M shift kit, something similar to the TFI upgrade, re-jetting the carburetor and high flow catalytic converter resulted in no measureable effects to fuel mileage. What did help was re-curving the distributor and re-setting the timing to run on premium fuel. Originally, my fuel mileage was 9 local and 12 highway. With the current tune-up it gets 12-13 around town and 15-16 highway. Unfortunately, this means I must run premium fuel to keep it from detonating but the price differential still hasn't caught up with the improved mileage. I also like the increased range. I don't know how far you can go with an AMC 360 because of design but I believe 17-18 is within range for an automatic transmission although I think it would require a slight compression boost, a better cam, and a really light right foot.

Lou

[shimniok]

My setup is 727/208/360 rebuilt with comp cams 260H which I think may be part of the mileage issue since vacuum seems so low all the time and power is pretty poor too which doesn't help mileage. 3" exhaust hi flow cat. TFI cap/rotor, MSD Blaster 2 coil (45kV). Edel performer intake, Qjet. 33's, 3.73:1. Roof rack, 4" lift. So I am pushing a lot of wind. The QuadraJet did bring mileage up into the 9-12 range. Winter gas seems to drop mileage 1-2. I typically get 10-11 on hwy in the hilly country. Can get better on the flat parts like western slope of colo, I get 12-14. Wouldn't mind another 2 mpg across the board.

A modern Chevy (friend's 96 pu) seems to be able to pull off 15 city 18 hwy pretty consistently so that tells me that TBI and at least overdrive trans with correct diff gearing is needed.

I'm told much can be had with driving technique. Keeping speed down probably helps too.

We're never going to get 25mpg with AMC gas motors, but a guy wouldn't mind getting a couple extra mpg. The difference between 12 hwy and 16 hwy adds up on long trips to Moab. :) I'm thinking of rebuilding a 401 in the garage so maybe I can figure a way to get enough power to increase mileage vs the smaller motor.

If I was terribly concerned about fuel mileage, I wouldn't be driving a GW built when the national speed limit was 55mph with all the aerodynamics of a house. That said, here's my story...

84 GW 360/TF727/NP229/2.73:1: LT235/75R15 On/Off road tires @ 36psi, 3" Rough Country lift, B&M shift kit, something similar to the TFI upgrade, re-jetting the carburetor and high flow catalytic converter resulted in no measureable effects to fuel mileage. What did help was re-curving the distributor and re-setting the timing to run on premium fuel. Originally, my fuel mileage was 9 local and 12 highway. With the current tune-up it gets 12-13 around town and 15-16 highway. Unfortunately, this means I must run premium fuel to keep it from detonating but the price differential still hasn't caught up with the improved mileage. I also like the increased range. I don't know how far you can go with an AMC 360 because of design but I believe 17-18 is within range for an automatic transmission although I think it would require a slight compression boost, a better cam, and a really light right foot.

Lou

[willysworker]

My Willys bodied Wagoneer chassis gets 10mpg in town. 360,t18,4.10 gears, and 4,200lbs http://i17.photobucket.com/albums/b89/willysworker/Super%20Delivery/front4.jpg

[max]

Just wanted to throw in my 2 cents. To check fuel mileage, divide the miles driven by the amount of gasoline used. The best way to really get an accurate figure is to average at least three tanks of gas, at the same gas pump and same gas station and record your miles driven and gallons used (to the tenths). A gas guage working or not working has nothing to do with it. Top off the tank in the same fashion each time, and do not try to cheat or lie to yourself. It is what it is, and be happy to be driving a cool looking classic vehicle.:thumbsup:

[LouM]

I forgot to mention one more significant change. I didn't just bump the ignition timing. I also advanced the cam timing 4 degrees. The thought about the vacuum, or lack therof, was right on and the driveability also improved tremendously afterwards.

Lou

[hardbody1]

Im somewhere between 5-8 (i really prefer not to know the exact number) and its on the jeep in my sig. My driving style doesnt help either the v8 and 4.88 gears make it really fun to drive. Im also 16 so i drive a little on the fast side. It was built with trail riding in mind and to have just enough streetability to drive to the trail ive got a nissan hardbody for a daily driver.

Kyle

[twmattox]

I am not worried about fuel mileage on the 82 I just picked up. I am more worried about quarts of oil per mile. :D


Reminds me of my old CJ...would stop at a gas station to fill up the oil and top off the gas...

[mark]

5 mpg bb chevy 410 gears

[willysrule]

where is the 30-35 on the poll????:D :D

my buddy has a J-10 with a 4BT turbo cummins in it...he clocks 32 on average...:eek:

I've wanted to put a diesel in everything since I rode in his, even my tow rig is diesel now...:thumbsup:

[70sWagoneers]

0mpg.... and a low zero at that. I burnt about 5gallons over a couple of days sitting in the driveway tinkering with stuff. Leaves a dense fog around the entire house.

[Brown Bear]

Be careful with that 70sWagoneers, I washed down a cam that way once, 4 lobes went round as donuts, and you could use the lifters for ashtrays.....

[bman]

Currently 9.5 in the city. My carb is crap and I'm going to do a TBI upgrade to fulfill my new years resolution of a better DD Waggy! :D My other DD when the waggy is being wrenched on gets 42mpg in the city. So 25.75mpg is my fleet average. :drivin:

Willysworker, the Willys bodied Wagoneer totally rocks man!:thumbsup:

[Marvin Gates]

If anyone that owns a FSJ is worried about gas mileage, you have bought the wrong mode of transportion. :banghead: :eek: :D

[Am4wag]

I don't even bother trying to figure it out around town.But a particular trip I make about 3 times a year; I got 12.5 one time,11 another,etc.I do remember another time (same trip/destination) I mostly ran at 75-85 mph.;did'nt bother logging the milage but do remember not having to stop as often for fuel.Guess because had so much momentum through the mountains.

BTW,my milage is really no different than it was w/the stock carb-intake-cam...........

[jhepp]

I get a solid 11 all though I tihink I could get 15 on the high way with no hills.I also have to boot it alot to pull out on the road because people cant seam to get over,it to hard I geuss.I never go over 65 my avg speed is about 50

[kennyh]

I don't check around town, but on my trips to Moab & Ouray this year the range was from 13.9 to 14.9, which I was plenty pleased with. All stock, though, except for the Magnaflow muffler. My wife's '98 Grand Cherokee 5.9L only gets 16-17 on the highway, which is not very good for modern technology. In her normal driving she only gets 13 or so. But the 'ol Wag has lots of personality. And history.

[Stonebraker]

With my 63 Wagoneer having the 230 ci. motor and 4:11 gears I get 13 mpg. in town and 17 mpg. on the highway.

[scantar]

Reminds me of my old CJ...would stop at a gas station to fill up the oil and top off the gas...

LOL! When I was 18 I had a Camaro like that, but it was "fill up the tranny fluid and top off the gas"

[medinajim2000]

I just got 13.68 in town :thumbsup: . Replaced the fuel sending unit o-ring. I knew I had a leak, but didn't know I was leaking that much gas :eek: . That's as good as my 97 Ram 1500.

[Wagabond]

Look at it this way. The streets here in AZ are teaming with 600 dollar a month payment, 250 a month to insure, 13 MPG Ghetto sled SUVs. I pay 35 a month for insurance, 300 in gas and not a penny more. I'm still money ahead.

[paddyp]

Somewhere between crappy and really crappy:D Really glad it has been relegated to toy status:fsj:

[FarRider]

I saw on line somewhere the sticker from a new 88 Wagoneer, and brand new, off the lot, it stated 11 City/ 13 Highway. They sure must not of cared about gas back then. lol In the city I'm getting about 10 on average, some weeks better than others.

[oldmanb777]

My Waggy's have all gotten close to the same mileage. Even the 401's. were not far from the 360 2v. But I find that driving style makes all the diference. Last year I saw an article that estimated that the average driver wasted 70 cents of every $3.00 gallon of gas because of poor driving habbits. I know my wife gets 11+ out of her Grand Cherokee, but I 14+ from the same car. My latest Waggy got a consistant 15 in mixed town driving, and 17 on the highway @ moderate speeds. Thats about 65 mph.

[motox-010]

I am gettin about 11 average. I dont drive much on the interstate though.

[funwheeling]

Since this is still being thrown around.

Yestarday was the real first time that I tried figuring this out.

Od start with 385.6 miles
at end of trip 462.9 miles
add 15% going from 285 to 305: end of trip miles 532.2
Total miles 146.6
Total on refill: 8.2 Gal
Est MPG 17.9

This trip was from home to hunting spot and back. Mostly highway with about a mile of 4 wheeling. On highway I was going about 70-75mph.

I ecstatic about this:thumbsup::D:p

[nw_upstart]

I've just gone through the vacuum system on the intake and my mileage seems to suck worse now that I have new lines in the right places. She runs great, but the mileage dropped.

Next step would be to adjust the carb to match the working vacuum system right?

That should bump it up a bit right?

[scantar]

I've just gone through the vacuum system on the intake and my mileage seems to suck worse now that I have new lines in the right places. She runs great, but the mileage dropped.

Next step would be to adjust the carb to match the working vacuum system right?

That should bump it up a bit right?

What kind of mileage are you getting? Anything under 10 would be a red flag to something wrong with your Wagon such as timing, power valve, idle mixture, dirty carb...stuff like that. If you're at 10-11-12 or so, then dialing it in is what you might do, but you might only pick up 1-2mpg. Still, that's 10 to 20%! :thumbsup:

Steve

[nw_upstart]

What kind of mileage are you getting? Anything under 10 would be a red flag to something wrong with your Wagon such as timing, power valve, idle mixture, dirty carb...stuff like that. If you're at 10-11-12 or so, then dialing it in is what you might do, but you might only pick up 1-2mpg. Still, that's 10 to 20%! :thumbsup:

Steve


I'm not too sure on how bad/good my mileage is right now, but I do know I was filling up less before I fixed the vacuum lines and she's running a bit rich. Before she was having some issues idling at stops and running cold in the morning was a pain, now it's not a problem. The engine I have in there is a patch engine(while I build the original the way I want it), but I did a bottom end and front end rebuild before putting it in. So new bearings, timing set, fuel pump, etc.

My thoughts are adjusting the carb and going from there, but what about those vacuum things on the manifold. I know very little about vacuum systems and thought maybe the plastic things that the vacuum lines run to in the front of the intake might be bad. Is it possible or common? Is there a way to test them?

[EEKAJEEP!]

1988 J10 360 2V CARB WITH 80,000 ACTUAL MILES - MILD CAM - 18 HWY - 14 CITY:drivin:

Drove from Petersburg Va to Wilmington NC (250 MILES) nonstop no refuel...still had < quarter tank of gas.

[82j20]

im anywhere 10-12 with my j20 360 4:10's got a prop system going on soon prop is half the price of gas here in canada

I gota say im super happy with my prop system...........I still gotta play with it a bit more to get the power i want but i know its there..........not stalling/flooding issues wheelin, runs super clean at any angle:thumbsup: and its half the price of gas here..............:fsj: oh and its cut my commuting costs in half:eek:

[Golddust]

This thread got me wondering so I pulled out my records. When new in 1977, I got just under 10 for the first 1600 miles. After break in at 9000 miles I got just under 12. Gas was only 55 cents a gallon. Since I only have 29,800 miles now, milage never was important. Now more evaporates than I use at 1000 per year so I try to keep the tank at a minimum and add dry gas to absorb the water. Now I get 10 maybe but I haven't changed any engine parts for about 15 to 20 years other than filters and battery, etc. Still have the original hoses.:drivin: but I did change the belts in the 80's.

At this rate I will need to rebuild the engine at 100K when i'm 125.

[duracell]

Hmm....in my 67 Charger 383/4spd/3.23:1 Suregrip I get 13+ on the highway. Of course I have to keep my foot from spontaneously finding the floor, but that's not too bad, I think. It's .030 over, .484 int, .508 exh/282/292 dur., 750 Carter stock exhaust manifolds through 2 1/2" pipes&turbo muffs, running on 245/60 15 tires on the rear.
my 70 dodge d100 with a 318 eddy 1406 tourker2 and 323's got 14.5 driving back from wilcox doing 5 over the speed limit the whole way without stopping. i got 3 gas tanks and can hold over 70 gallons

[max]

I have stock ignition, exhaust and everything else. 12.1 mpg driving city streets and very little highway. Correct air pressure in the tires, everything lubed to specs and not mashing the gas too hard. I was not really babying it either. 87 waggy w/360.
chuck

[Duke(Gwag)]

My truck is still fat but i ripped out the headliner got rid of the door panels and replaced them. took out the rear seats, got a cherry bomb to replace the muffler, and waiting for aluminum rims to light my load. i get like 12-15mpg. Also gutted my cyat converter.and running stright headers. Also said screw the old air cleaner and got a K&N filter system.

[grand_wag_85]

My 258 J10 apprently gets 12.2 city and 17ish hwy but I've never had it out on the road so my mpg numbers are undoubtably in the single digits.

My XJ could get up to 30mpg back when stock but now gets between 15-20 since the lift, meats& lightbar.

The Charger does single digits BUT that's all in how I drive it ;)

The 85 GW got a solid 10 regardless

[papampi]

I've got about 12 before I put the weber 38 ! now i get about 10 ! I'm going to install a 4.0 head with port polished on head and manifold ! if there was any change I'll post !

[82Laredo]

I get about 8.5 on the street and 13 on highway. I think I would get better mileage on the street if people would get off my back when I take off. Also, I don't know how to adjust the carb. and it's been running rich since I bought it a month ago.

[prayforsurf]

my mpg has been varying a lot since i started keeping track which is very recently. like someone mentioned earlier, i was kind of scared to find out hahaha. anyway, at first i was geting about 10-11 then i messed with i few things that i thought would help and it dropped to 9, heh. then for the final time i took a nice long day, did the vacuum lines as best as possible, tuned the carb, and did a TFI upgrade, im now waiting to see how my mileage looks. i know after the TFI upgrade alone i went back up to about 11, so im hopeing that the carb tuneing and the vac lines bring it up another 1-3 mpg, i would love 4 more, but i doubt that. still have a few things i would like to do before i have a set number of miles per gallon.

[79-88fsj]

use to get 10/12 and recently was getting 10mpg highway and 6 city. My cat was stopped up, cut it off and no muffler now i have gotten 14mpg highway/city combo driving it hard for 3 weeks now

[grand_wag_85]

My Chero is getting between 10-11 now, I have gotten it up to 13 a couple of times but I just can't seem to dial in the carb. I think after that it'll be capable of 13+......Hopefully

[gsmikie]

i just went to laughin this morning and back 135 miles each way so 270 miles on just under 5 gallons :thumbsup:

[scantar]

i just went to laughin this morning and back 135 miles each way so 270 miles on just under 5 gallons :thumbsup:


Yeah but I bet you looked pretty funny on one of those little motorized skateboards with your WWII flight googles and leather helmet.

:D

[bman]

LOL! I was thinking a moped my self. My little piece of crap Geo Metro doesn't even do that well! :eek:

[nsanebiker]

On a trip from Ashland City, TN to Thurmont, MD (the northern route through Kentuky and West Virgina) I got about 12-15. Daily driving, stop and go city traffic, I get about 8-10.
Since June of last year only burned a quarter of a tank just starting it up every month, haven't driven it anywhere.

[J10_Jimbo_2]

12.9 an my last fill up, and I am still working out the kinks in this ride. Probablysend this to the gutter when I install my four barrel though.
Jimbo

[Wagabond]

12.9 an my last fill up, and I am still working out the kinks in this ride. Probablysend this to the gutter when I install my four barrel though.
Jimbo

You'l do better than that if you stay out of the secondaries. If not you'll at least surprise the hell out of a lot of soccer moms.

[BenE]

I have only driven a few tanks of gas through my new motor so it’s getting better. Started at 8.1 and is now at 10.4, but that is already better than my little Jeep, it only gets 9.5.

My gauge is broken so the first half of a tank I get about 65 miles to the gallon and the last half it is about 4.5 miles per gallon…. I should just drive using the top half uh?

[Wagabond]

I have only driven a few tanks of gas through my new motor so it’s getting better. Started at 8.1 and is now at 10.4, but that is already better than my little Jeep, it only gets 9.5.

My gauge is broken so the first half of a tank I get about 65 miles to the gallon and the last half it is about 4.5 miles per gallon…. I should just drive using the top half uh?

Mine does that. I got from L.A to Desert Center Ca. ( 150 miles) in about half a tank, and from D.C to Blythe ( 65 miles) on the other half. I was still full when I got to San Bernardino, about 70 miles from where I started.

[J10_Jimbo_2]

My fuel gauge is stock, so it stays on empty no matter how much gas is in it. Thought about buying one of those new fangle things called a sending unit, but if I figure the price at "miles per parts" it makes my "miles per gallon" look good..

[grandcoug]

I posted almost two years ago that I was getting almost 20 mpg on a 400 mile round trip in my 1990 GW. You guys almost laughed me out of the building. It's possible. I have a very mild to stock rebuilt 360 with a rebuilt 727, TFI ignition with no ballast resistor, and a rebuilt 2150 with a single stage power valve. My ignition is advanced to 12 degrees and gap set at .48. My spark plug wires are 8 mm from a Ford Mustang that had TFI. I replace the air cleaner and change the oil regularly. In town I usually am down to 12-14 and mixed use is generally 16-18. I have to say this is one of the sweetest and smoothest running motors I have ever owned, and I can't explain it. My other two get about 8-12 mpg all the time no matter what.

[bman]

It's voodoo magic I'm tellin ya ;) Soon as I get my HEI replaced I'll see what the TBI does for me. I was getting 9.5 with a badly tuned 2150.:drivin:

[DieselSJ]

There needs to be a 20+ option. I got just over 21 on the last tank. :D

[dirt lovin doc]

Just got the jeep and haven't run through the first tank of gas. Guess I need to get the wheels back on it.....http://www.ifsja.org/forums/vb/images/icons/icon10.gif

[YellowJeep]

Someone mentioned it already, but I'll throw my $0.02 in here.

These things should be able to get quite a bitter better than the numbers I have seen here. The majority of the rigs out there have a TH400 or 727 trans. Drivetrain loss through either of them is 18-20%. A manual trans is more in the neighborhood of 10% loss. A 700R4/4l60e is 13-15%. So, swapping your trans out starts looking like a pretty good way to get some fuel mileage especially if you look at a 700R4/4l60e or 5/6spd trans and you'll get overdrive to boot which will bring down your overall cruise RPM. Fuel injection is another great way to pick up some mileage. While it won't defy physics (like a joecell!) it does help. Mostly from the fact it can limit fuel to the engine when the computer wants to whereas a carb will always deliver fuel as long as their is air moving past the venturi (AKA the motor is rotating).

BTW...I have no idea what my rig got, but I am hoping for 16 or more with the 5.3 swap and 16% OD conversion in the QT. If it isn't there, I can always alter fuel curves and spark advances in the ECM to get it better....I love GM electronics!

[Fiodh. Argus]

let's hear it for joecells!!! LOL! I am dreaming dreaming of someday creating hydrogen on fly and powering our rigs with water... wouldn't that be great? If only it were possible...

[jeeping1974]

don't know about the rest of you but i fall into the category of 5-10. i use mine for just off-roading so that could be the "cost of fun". :fsj:

[peluns]

took 79 wagon :fsj: on 140 mile round trip :drivin: to jeep club meeting near st louis got 8 miles to gallon:rolleyes: ... 2 lane highways ran 55 to 70 most of the way:o ... sending unit is leaking at the top:banghead: ... need to replace the gasket:eek: ... recent rebuild on 2150 carb probably need someone to check settings ....

[TINMAN93]

OK, I haven't tested the mileage on mine for some time. After the 410's I'm sure I don't want to know. What I do know, is that I get better mileage towing it in on my trailer behind my 3/4 ton Dodge. Now, that's scary mileage! I do know that my next big project will be switching to Propane: clean, cheaper than fuel injection, and can run at any angle for just some of the pluses.

Tinman

[Tobynine9]

I just went from a gas station in NW Houston, topped off, drove to Galveston for a meeting, then drove back and topped off at the exact same gas station. Total distance was a tick under 175 miles according to Google Maps (my odo is inop along with all the other gauges). It took 9.924 gallons to top it off: 15.1 mpg. That's not too bad. Almost all highway driving, some of it stop and go, with the A/C on.

[2003 mcs]

I have now put on 800 miles on the GW. With the 32's the speedometer is off 5 mph (according to the radar signs) and the odometer reads 9/10ths of a mile for every mile (mile marker to mile marker). So if the radar and the mile markers are correct, I am getting a 11.68 mpg (corrected). The thing that sucks is that small gas tank.:mad:

[GrayGhost]

Just got back from a 670 mile each way trip, a little longer coming back, kicked around N. Fla on the way home! 5 1/2 tanks going up, 7 coming back. Got 33's on it and that just doesn't help at all :banghead: My speedo is about 10% off because of the tires. Figured about 8 miles to the gallon.

[Jeepsmith]

11-12 MPG

[79 widetrack]

With the stock gears and 35s with my 360 i'm seeing about 11mpg and actually not really depressed with that, would like more but what can i actually expect? O and thats with 87 octane.

[87Woode]

i get about 13 around town and about 15 on the high way:) . thats what the window sticker said and so far its true. im hoping i can get up to 16mpg on the high way and 14 around town after moding and making it run better.

[UnkleMunky]

I've been keeping tabs on the gas in the '78 since I started driving it in 2000. Since the gas gauge went shortly thereafter, I went back to my post-it note gas guage and fill it almost every time. I write it down in a log book every fill, so have records on this (around 30k worth). They are in the truck right now, but I know the patterns pretty well. To be fair, I'd say my average is about 16mpg. But my common range is 15-18. Anything below 15 and I can trace it to abnormal usage (long idling or lots of small runs/start-stop types, etc.). Above 18 has happened a number of times, even a +20 or two. But the +18s were exceptions, not the rule, though so are the under 15s. So, my 15-18 range is where I'm being realistic on this rig.

The 18+ runs were actually interesting. Not all downhill, but lots of up and down and corners and everything, but....the key was keeping the truck in its sweet zone of 45-55 mph overall. The truck *hates* going over 60mph, so I avoid the freeway as much as possible. A few of the 19mpg trips were in that 45-55 zone, but also with full loads of wood, so I was particularly pleased with that, but the speed seemed to be the key again.

This is all running basically stock. About the only *upgrade* I've done is sidegapped plugs. Change oil and filters regularly, but it still needs work. Exhaust is nothing to be impressed with, and some of the other tuneup work (especially on carb) I've just not done in ages. This is also running with the high topper on this, so I'm eating more wind than the usual FSJ bricks out there.

78 J10 longbed - with high topper / 258 / T18 / D20 / 3.54s....all stock / P235-75R15 tires.

My '77 J10 that I had before the '78 (similar setup, but with a T15 instead) seemed to get in similar range.

[Towtruck]

I'm seeing mid 30's on the hiway....attribute it to improved aerodynamics resulting from removal of all those honcho decals and lowering the front end. Also a huge weight savings in losing the decals and chrome...street rods rule. ;)

[JPSwapMohn]

Last time I checked it, mostly was running up and down I-95 from Bragg to Richmond. With calculaed correction for the tire size, i was around 15.5-17. I am happy with that, but it will take 40 years for me to get the cost of engine swaps/etc. back out of it....as if that was my intent!

LT1 with mild cam, dual exhaust, etc. I did have the Flowmaster 40's swapped out for a set of turbo mufflers. The 40's were just TOO loud for daily driving. Since I cruise at rather low RPM's, I didn't think they sounded good anyway. I have read that they estimate about 17HP gain with use of the 40's. I was still playing around with tuning and such so I cant really say i felt the difference between the 40's and the turbos.

[BarryL]

Hey, JPSwapMohn. First, thanks to you for the service you are providing to your country! I hope everything goes well for you in Iraq.

Did you do the small block swap yourself?

[seriouswood]

I don't dare to even figure it for my 90 GW. I would just cry! I drive my 95 1/2 ton Chvy P/U when I want good MPG! ha ha ha ha

[Mack_T]

I keep checking my numbers to make sure they are accurate. My speedo is very close to being correct. I get 8 to 10 off road, and 10 to 20+ (as high as 22) on road. Usually 10 to 14 during the week, but on road trips, keeping 60 mph, it gets a surprising 20+. I really can't believe it, but it's happened more than once!

Clay

[Serious Johnson]

Now that I've had the Wag back East for a while, I find it getting in the 11-13 range. That's mostly short runs to the beer store, occasionally romping it just to hear the tires howl, but still lower than I'd expected.

I did expect a mile-and-a-half elevation drop to hurt mileage, but maybe just take it from 20 to 16 or so. The thing does feel as if it's often running open-loop, so maybe the O2 sensor just needs cleaning, or maybe the chip tuning is not quite up for so much elevation change.

S.J.

[91G-Dub]

Last couple of tanks of ga$ I've averaged almost 13MPG. :D
About a 50/50 mix of local and highway driving.
Actually not too bad. Much better than the 10MPG I was getting prior to tune up and tweaking the carb.

[Wagonforever]

I'm getting 12 in my 86 that's still got all it's smog equipment. I was getting about 14 in my 90 which was completely de-smogged.

[mattmopar440]

I get 10 -11 on a good day with 89 oct or higher
401 4 barrel small cam

[waynestiles]

Just made the 1st leg of the trip home with the GW. Bought it in TN, had the exhaust replaced from the y-pipe back with 3" and a flowmaster--cat free. stock 380 with 180K on it. had the stock carb, sorta tuned, replaced vaccuum and other rubber lines, the carb guy deleted some vacuum lines. said it need a rebuild, it stumbles on "transitions", either lifting or light accelleration. However since I'm replacing it with a new manifold and carb ASAP I'll live with it for the res tof this trip. I ran two partial tanks of gas---about 250 miles, (gas gauge is wonky and I'm being conservative on refilling) on mostly 4 lane. GPS gave an average speed for the trip of 69.7 though I was cruising comfortable at about 75 much of the way. I got just a hair over 15 mpg on one refill and just under 16 on the other

[markh58]

Getting 9-11 'round town, 15-17 interstated at 65-70mph. :drivin:
***Been told to only run high octane 'cause todays 93 octane is yesteryears 87 octane, also been told don't matter 87 octane is fine. Noted that my '88 is stock 'sept for the Holly 2300 2barrel carb.

Thoughts???:rolleyes:

[Wagonforever]

Getting 9-11 'round town, 15-17 interstated at 65-70mph. :drivin:
***Been told to only run high octane 'cause todays 93 octane is yesteryears 87 octane, also been told don't matter 87 octane is fine. Noted that my '88 is stock 'sept for the Holly 2300 2barrel carb.

Thoughts???:rolleyes:

I get spark knock in my 86GW if I run 87, seems to be ok on 89. That's really just a timing issuue though, if I retard the timing a tad it'll fix it. If your not getting any knocks or pings run the lowest octain possible, you'll get a more complete burn. I ran 87 in my 90GW for 80,000 miles (on top of the 120,000 that it had when I got it.) without a problem. These are low compression motors that don't need high octain, if you run it you're just throwing your money away.

[markh58]

Spark knock---yep, all is well until I'm moving from 65mph to 70mph and over. (?) I've tinkered with the timing, and even with a recent tune-up still knocking at 70mph+. So is it octane, timing, grimlins...?

[Wagonforever]

Spark knock---yep, all is well until I'm moving from 65mph to 70mph and over. (?) I've tinkered with the timing, and even with a recent tune-up still knocking at 70mph+. So is it octane, timing, grimlins...?


Actually you usually get spark knock under heavy accelleration. You can get it taking off from a stand still. Are you sure it's spark knock?

[markh58]

Actually you usually get spark knock under heavy accelleration. You can get it taking off from a stand still. Are you sure it's spark knock?

...sounds like spark knock, I'm no mech so I'm willing to listen to other options. As for heavy accerllation at take off, with $3.00+ for a gallon of gas I avoid the race car take off as much as possible. But I get your point and will give it a try to see wht happens.

Thanks for the feedback, as always leaning on y'all for help...

[Wagonforever]

...sounds like spark knock, I'm no mech so I'm willing to listen to other options. As for heavy accerllation at take off, with $3.00+ for a gallon of gas I avoid the race car take off as much as possible. But I get your point and will give it a try to see wht happens.

Thanks for the feedback, as always leaning on y'all for help...


You should open her up every once and a while, it's good to blow things out occationally. I don't do the race car thing in my wag either, but I still put the hammer down every once in a while. As long as your not doing it from every stop light it won't impact your milage that much. Like I said I get about 12 MPG, I don't baby it, but I don't race it either.

As far as you pings the only thing I can think is maybe your vaccume advance isn't hooked up right. But that's really just shot in the dark.

[markh58]

Thanks for the tip. I'm having some carb work done next week, I'll tell my mech about the pinging and have him check out the vac. advance.

Like I said before, it's at it's worst excelling from 65 to 70mph.

[GWDriver]

About 31.9 .......................... in the Toyota pickup. OH, that's right, this is an FSJ site.

I was getting about 12-14 before going overseas. The engine's at the shop right now so I'll have to wait until the GW's back up and running to see what it is now.

[Am4wag]

Stock set-up I got 12.5 on very long hiway trips.....around town,I never bother checking.With the upgrades in my sign.,I am getting about the same on the hiway,but do notice rig stays thirsty when in town/in stop and go traffic.It's hard to keep my foot out of it..........

[gojeepin]

mixed driving 10-12,3.54 gears with 34" tires,only 2000 miles on engine though,hoping for better once its broke in good:cool:

[El Jefe]

around 17

[2003 mcs]

MPG getting worse, 9-10mpg in mixed driving.

[northernjeep]

I changed it over to Howel fuel injection when I got my grand wagoneer, before I even drove it, and I get about 12 in the city:drivin:

[markh58]

12 in da city! What is this Howel fuel injection of which you speak?
I was advised NOT to switch over from the original Motorcraft 2150 to a Holley 2300, but would I listen...Noooo... my mpg has gone from 10/11 to 7/8 'round town...:eek:.
1st lesson...pay attentiion to the advise given on this forum, 2nd lesson...pay attention to the 1st lesson!

[nograin]

I've posted 10-12mpg because that's what its been getting the last year. However it was getting 12-15 before that. Today I checked the timing and it was about 7 degrees retarded. That easily could explain the milage drop. Maybe a little stretch on the timing chain, or more likely the dizzy got moved a little accidentally.

I hope to change my vote later (if allowed)

[Wagabond]

All of you 9-12 mpg guys need to ditch the Motorcraps. A ratty Q-jet will get at least 14 if you stay out of the secondaries.

[energyhutch]

Just took a trip in the 78' Cherokee from Phoenix to Lubbock, averaged just under 14 @ around 70. All stock in the 360.

[68_Gladiator]

i wish i could get 14 with the Q-jet on my full size chevy 350, but i get 9-10, dont know what the amc 327 gets yet as i havent driven it much yet. ill post up when i crunch the numbers.

[awazakai]

Ok I haven't read all the posts in this thread but... 20 mpg with a 360 in a FSJ is very very very very very very hard to believe. Anyone that is getting above 15 should share their ENTIRE setup with everyone else. I get 15 highway with 2.72 gears, recently rebuilt engine, edelbrock performer intake, and a meticulously tuned 600cfm Holley carb. I have a '97 1500 silverado 2wd, 5.7L vortec, completely stock. The best highway mileage I have ever gotten is 18-19 and city 12-13. If there are FSJer's out there can build an old *** jeep that competes with that I would like to know how.

[GWDriver]

Haven't checked in a long time, but before the engine went south and the rebuild now, I was getting just a tad over 14. Something like 14.2?? After I get the carb rebuilt and back on, who knows. It'll probably be in the 2s.:eek:

[Duke(Gwag)]

i slaped on a HOLLEY 670 CFM truck avenger series carb, highway i get 8, city about 6-12 depends on if im in gofast mode.:D

[El Jefe]

last summer I was averaging 17. Combo driving of freeway and town. Chevy 350 with edelbrock intake and 1406 carb. th400, dana 20. 410 gears in the dana44's running 315/75 16's. But I'm very light footed and had no doors, no tailgate, no rear seat.

[1977cherokeechief]

well, i finally got to drive my DD enough to try to guess what my gas mileage is (spedo does not work) if i do the math i was getting at 16.7ish. but i forgot to add in a couple low maintenance road trips.:drivin: :fsj:

[Campcar_david]

I consistently average about 7mpg no matter what I do. My gas tank does have a leak though. It's a newer plastic tank and it leaks from the top if I park it nose up hill with a full tank. I think it's probably the sending unit but now that it's lifted I can get under and see exactly where.

It also stinks bad when running. Like eye-wateringly bad fumes, so there is obviously something else I can fix.

[Lindel]

All FSJ gas tanks have a leak, it's called the engine... :cool:

[moorehouse77]

Well my speedometer is off with the 33's so I have to guess a little. It shows about 8 miles per gallon so that should be about 10 miles per gallon. I got a stock in need of rebuild 401 with a Holley 670 avenger carb and a part time kit. I actually didn't get any improvment in mileage with the part time kit and a t-case rebuild.:(

[COLOFIREMAN]

Has anyone seen or tried this?:confused:
http://rosgio.water4gas.hop.clickbank.net/?tid=DIESEL

[WaggThis]

Has anyone seen or tried this?:confused:
http://rosgio.water4gas.hop.clickbank.net/?tid=DIESEL

yeah and it works

[TexTJ209]

If by works you mean wastes your money, then yes.

[COLOFIREMAN]

I just don't know about exposing the engine to that much water vapor. But then again no one ever though you could make fuel out of corn???:confused: :D

[GWDriver]

Has anyone seen or tried this?:confused:
http://rosgio.water4gas.hop.clickbank.net/?tid=DIESEL

Geeeeeeeeee! Think of all the FSJs we could afford to save from the crusher, and to think that all it costs us is good old H2O. :rolleyes: Oh, BTW. Anybody want to buy a bridge in Brooklyn??

Actually, the idea is a good one. Not very feaseble at the time, but still a good idea. I think the idea of using Hydrogen as fuel has explosive possibilities. My concern would be containment of the hydrogen gas.

What I'd REALLY like to see is a fuel that could be relatively cheap, plentiful, nonpolluting, made here at home and that would free us from Middle Eastern blackmail. Just think of the clout the US could have if we didn't NEED other countries for our fuel. (We don't Need them, but we are a masochistic bunch)

Add a Wag that gets 20+ mpg and ...............................:D

[mafos4471]

What are you guys getting on average for fuel mileage. I'm just wondering what the norm is. I've done some searching and didn't see a thread like this. let me know and if you want, tell us about your setup so we can get an idea of what we are getting into.

As near as I can tell, I'm getting about 8-10 with a 455 buick and 600 cfm Holley, running 37" goodyears...:thumbsup:

[Locked and Loaded]

If you want to get 2 to 3 mpg more for little money. All you have to do is get a HOT cup of coffee with no lid. Everytime you drive put it between your legs. (works better for city driving.)

[scorpio_vette]

well when i first got my waggy, we took it on a couple hour highway trip, and if my wife wasn't there to do the numbers with me and see it herself, i might have though i just sucked at math. but i was getting 17.5mpg out of my old 360 doing a nice steady 70mph. then on the way home with a 3000# trailer and my new XJ rollcage on it, i was still pulling 14.5mpg at 70mph.

and then..................................i had this bright idea to start cleaning it up and try to improve my mileage. now i seem to be getting the same average that everybody here is getting. :(

[shumbody]

I got close to 18 once, driving my son up to Scout camp in the Adirondacks the day after changing the air filter. But the road into camp was 16 miles of dirt, so after the trip I was back down to my normal 12.:)

[GWDriver]

Hmmm, I read today that a 70's??? Jeep Laredo with a 6 cylinder and a 5 speed could get around 20 - 22 mpg on the highway. Any truth to that?

[Daace]

are you sure of it ? I have around 29 mpg on highway/interstate... with a 258 but, the difference is huge..

[Wagabond]

are you sure of it ? I have around 29 mpg on highway/interstate... with a 258 but, the difference is huge..

Either your English/Metric conversion is way off, or you are factoring in the miles the Jeep spends on the train.

[countryblackbear]

i have a 65 fsj with a buick 350 3 speed trany 4:27 gears 4 bbl quadajet hei ignition with accel cap rotor and coil running 33 12:50 15 and i get 14-15mpg

[Daace]

Either your English/Metric conversion is way off, or you are factoring in the miles the Jeep spends on the train.
nay.. it's stock..and it's the conversion of the metric results.. i'm using 10 liters per 100 km.

100 km is 62.42 miles. (1.602)
10 liter is 2.09 gallon (4.78)

so to know how many milles i do per gallon.. i divided 62.42 by 2.09..

And i must admit, i had to test it several times because i didn't believe it.. the ZJ that is stock and with multi-point injection is using more fuel than a carburettor engine..

[TexTJ209]

nay.. it's stock..and it's the conversion of the metric results.. i'm using 10 liters per 100 km.

100 km is 62.42 miles. (1.602)
10 liter is 2.09 gallon (4.78)

so to know how many milles i do per gallon.. i divided 62.42 by 2.09..

And i must admit, i had to test it several times because i didn't believe it.. the ZJ that is stock and with multi-point injection is using more fuel than a carburettor engine..


Actually it'd be a little under 24mpg. You were using UK gallons, and not US, hence the confusion. ;)

http://www.convertunit.com/fuel-consumption-calculator.php


Still awesome fuel mileage though.

[beloth]

a kraut mobile (VW bug) gets 24 to 29 mpg if it is lucky...that is a 4 cylinder with a stick shift on a good day..no way in hell.

[Daace]

Everything so cool with "litres", especially when you were used to them since the day you were born... I didn't know there was a US and UK gallon, what's the difference between them ?

[Daace]

oki, next time shut up your big mouth and read.. i followed the link..:D and then I know, indeed then it's between 21-23.. which sounds more rationnal..

[Serious Johnson]

oki, next time shut up your big mouth and read.. i followed the link..:D and then I know, indeed then it's between 21-23.. which sounds more rationnal..

No worries! 24 (US) MPG is plenty respectible and even credible. Shucks, if a fool like me can wring 20 MPG from a big, growly V8 Wagoneer with 3.73 gears, anybody oughta be able to do it!

Seems some here make it a point of pride that their rigs slug fuel like there's no tomorrow, as if their very manhood depended on letting everyone know that they drive an anti-Prius.

Dear Li'l Sis's V8 Toyota pickup gets 20 MPG on a good day. Li'l Brother's standard-issue professor's Volvo sedan gets maybe 22. I once was forced to rent a Toyota Sequoia SUV. It had roughly the same room inside as my Jeep, pretty much the same power, and got almost exactly the same fuel mileage. I don't know why folks insist that these old Jeeps are such terrible gas hogs. Prii they ain't, but there's a lot similar out there, and some worse.

S.J.

[Wagabond]

No worries! 24 (US) MPG is plenty respectible and even credible. Shucks, if a fool like me can wring 20 MPG from a big, growly V8 Wagoneer with 3.73 gears, anybody oughta be able to do it!

Seems some here make it a point of pride that their rigs slug fuel like there's no tomorrow, as if their very manhood depended on letting everyone know that they drive an anti-Prius.

Dear Li'l Sis's V8 Toyota pickup gets 20 MPG on a good day. Li'l Brother's standard-issue professor's Volvo sedan gets maybe 22. I once was forced to rent a Toyota Sequoia SUV. It had roughly the same room inside as my Jeep, pretty much the same power, and got almost exactly the same fuel mileage. I don't know why folks insist that these old Jeeps are such terrible gas hogs. Prii they ain't, but there's a lot similar out there, and some worse.

S.J.

But the Sequoia has twice the HP. :rolleyes:

Of course, if one were to rev a 360 to about 6500 rpm,like Toyota does the IForce, and use the data from a split second before it exploded, it too would generate some rediculous Numbers.

[gsmikie]

turbo sprint ..................240 miles = 4 gallons = $14.40..... with a/c :D:D:D:D:D

[GWDriver]

No worries! 24 (US) MPG is plenty respectible and even credible. Shucks, if a fool like me can wring 20 MPG from a big, growly V8 Wagoneer with 3.73 gears, anybody oughta be able to do it!

Seems some here make it a point of pride that their rigs slug fuel like there's no tomorrow, as if their very manhood depended on letting everyone know that they drive an anti-Prius.

Dear Li'l Sis's V8 Toyota pickup gets 20 MPG on a good day. Li'l Brother's standard-issue professor's Volvo sedan gets maybe 22. I once was forced to rent a Toyota Sequoia SUV. It had roughly the same room inside as my Jeep, pretty much the same power, and got almost exactly the same fuel mileage. I don't know why folks insist that these old Jeeps are such terrible gas hogs. Prii they ain't, but there's a lot similar out there, and some worse.

S.J.

Comeon, Serious, Give us a hint. Woncha?? Huh??? Woncha?? Lemme know how to get 20 mpg. Pulleeeeezee???:D

[GWDriver]

Actually, My 350k+ Suburban still gets 19 - 23 on the road at 60 - 65 mph.

[markh58]

Comeon, Serious, Give us a hint. Woncha?? Huh??? Woncha?? Lemme know how to get 20 mpg. Pulleeeeezee???:D

YES ! PLEASE ! tell us the secret - @ $3.75gal. we all dieing to know...:rolleyes:

[Serious Johnson]

Comeon, Serious, Give us a hint. Woncha?? Huh??? Woncha?? Lemme know how to get 20 mpg. Pulleeeeezee???:D

Not especially difficult, really. A manual transmission is pretty much a must, though modern overdrive slushboxes might do OK on the freeway. A bit of compression bump, some careful head work, electronic fuel injection tuned for lean cruise with a lot of spark advance, low-viscosity synthetic lube everywhere, tires at 50 psi for trips, etc., etc.

Of course, the main thing is to lug the motor mercilessly, using no more revs than necessary (which is the main point of the manual gearbox). Large throttle openings and short-shifting through the lower gears results in the fewest combustion events per distance traveled, and that trumps everything else like BSFC, torque range, pumping losses, etc.

And driving at high altitude certainly helps, at least with fuel injection. It appears that mileage on this rig may be as much as 25% better at 8,000' than at sea level, with attendant power drop. Up here, 0-60 takes a full 9 seconds, while down by the coast it's a tad under 8.

My most recent tank netted a bit over 17 MPG, but that was all uphill from the Kansas Plain to near Monarch Pass, with a pretty full load. I've gotten about 22 MPG in the other direction.

I'm pretty sure that with a wide-band O2 sensor and a bit more chip tweaking I could get the ol' dinosaur up to 25 MPG.

S.J.

[shimniok]

I still obsessively record all fill ups, gallons, mileage, and calculate mpg. So with the "new" motor (since my last post), a 100k 360, and a 2150 I have been getting between 10.5 and 12.9. Hwy runs down 285 seem to be getting me into the 12's. city driving and hilly stuff seems to come up with 10.5-11.0.

Just dialed the carb lean to get thru emissions but need to run through a couple of tanks to see where I'm at.

Still running 4" lift, 33x12.50s, 3.73 gears, roof rack, etc. Speedo is dead on perfect.

I think running a manual transmission is good for a few mpg. Add a 258 to that, and 20mpg is probably within reach -- under certain circumstances.

[Warmachine]

So far I've increased my daily driver mpg's from 5-9mpg, to 12-15mpg in town driving. Was a $200 investment (was a nightmare for the PO, so he wanted it out of his sight). Threw some new sensors at it, and voila'! Picked up a '95 Grand Cherk Laredo (ZJ)...only on the second official week of using it in a DD role, but it'll soon pay for itself! LOL

[GWDriver]

I find this thread fascinating! Imagine what it would be like if we all made a concerted effort to not only tweak our Wags and Cherks for optimum power performance but for fuel mileage as well. A fine balance of the two if you will. It would be nice to enjoy the fun of our addiction without the headache of rotten fuel consumption. I'd be happy with 16-18 mpg, but why stop there?

Food for thought?? How about a section that deals only with mpg increases................ or does one already exist?

[DieselSJ]

Actually, My 350k+ Suburban still gets 19 - 23 on the road at 60 - 65 mph.

Gotta love that 6.2!!!

[jackz4000]

I haven't checked lately and with the price of gas I don't really want to know. I have a stock '90 GW with a 360 2 bbl. About 4 1/2 years ago I had the engine rebuilt and I did check my mileage closely for a while. I was getting 15 on a country highway at speeds of 55 and below. In town I know with stop and go the mileage was less, but I never drive more than 2-3 miles in town in a week.

Since the engine re-build 4 1/2 years ago I've only driven the GW about 20K and I suspect the mileage is about the same. But the gas prices sure are not.

Of course I don't have a monthly car payment to make on the GW and it is all gravy and that is a small pleasure. I have friends who have blown a wad on Toyota pick-ups and they are at 15 mpg too and they still have the monthly payments to make. A few other friends with diesel pick-ups and they are not happy campers.

So lets see. My 4 1/2 years with this 90 GW have been quite good. Cost me $6K with the rebuild and lots of other stuff replaced at the time. And I probably average $300 per year replacing this or that part so it is fairly inexpensive for me as a fairly light daily driver. So far...

[chemijeeper]

presently I am in the middle of a 4bt/np435 sway into my 89 GW. I think that should put me somewhere around 24-28 mpg. I also have been researching setting up variable displacement like on the newer pickups. It was done on a 4 cylinder Mishu so I know that it can be done. Getting from knowing it can be done and actually doing it is the problem:p.


here are some links:
http://en.wikipedia.org/wiki/Variable_displacement

http://en.wikipedia.org/wiki/Multi-Displacement_System

with a projected improvement of 20% in fuel economy, that would theoretically put me at 28-34 mpg...but its still a longggg road from theoretical to rollin down the road. :fsj:

I hope this spices up the discussion.


*edit: after a little realtime review of data, it seems the gains from displacement on demand range from a 5-10% increase...not seeming like as much of a worthy venture now...I'll keep researching though.

[chemijeeper]

I was just thinking about it while doing some internet wandering...if you deactivate 2 cylinders, closing both the intake and exhaust valve(still working on the 'How' part of that) the turbo would then become oversized for the now 2 cylinder engine, creating a very lean mixture=high egts=bad. maybe a variable wastegate or compound wastegates to limit the boost?? :confused:

Hopefully smarter people than me will chime in.

[Mack_T]

Just some more infos I recorded last weekend in my GW:

Trip to Ukiah from Rohnert Park. About 70 miles one way. Filled up in RP (almost Cotati if you are checking the numbers on Google Maps), and filled in Ukiah. My odometer is wrong, with the larger tires, but in any case...
3 gallons.

That was cruising. I mean really cruising. Gas station to freeway, 1/4 mile. And the same in Ukiah. The entire trip was cruise control at 60 mph (except where it was 55 or slower). No harsh accelerations, wind, or anything. It was foggy in RP, and clear in Ukiah. All windows were closed, it was cool enough to use the heater a little.

Now the trip back was another story. We hit traffic, the wind picked up, it was dry but warmer. We also had the 2 front windows & rear window open. I used at least twice as much fuel on the return trip. Another factor could have been fuel quality; during the week I always use the same gas station. When you go out of town, well, you have to use what's there.

I was also loaded with 4 occupants as well as gear :)

Clay

[YoungClayB]

Just some more infos I recorded last weekend in my GW:

Trip to Ukiah from Rohnert Park. About 70 miles one way. Filled up in RP (almost Cotati if you are checking the numbers on Google Maps), and filled in Ukiah. My odometer is wrong, with the larger tires, but in any case...
3 gallons.

That was cruising. I mean really cruising. Gas station to freeway, 1/4 mile. And the same in Ukiah. The entire trip was cruise control at 60 mph (except where it was 55 or slower). No harsh accelerations, wind, or anything. It was foggy in RP, and clear in Ukiah. All windows were closed, it was cool enough to use the heater a little.

Now the trip back was another story. We hit traffic, the wind picked up, it was dry but warmer. We also had the 2 front windows & rear window open. I used at least twice as much fuel on the return trip. Another factor could have been fuel quality; during the week I always use the same gas station. When you go out of town, well, you have to use what's there.

I was also loaded with 4 occupants as well as gear :)

Clay

So what was your MPG? I am calculating just over 23 MPG...can't be right :)

[Mack_T]

So what was your MPG? I am calculating just over 23 MPG...can't be right :)
Yeah, everytime it does that to me I think the pump at the gas station is broken or something. Really odd occurance... and it does not do that all the time either. It did good like that last year on my trip to Usal beach up North as well, and has happened several times on that same trip to Ukiah. So, my mileage varies from around 15-17 to 20-23...

If only I could figure out what it takes to do that ;)

Clay

[shimniok]

Latest gas mileage since tweaking to fly thru emissions (these entries are a mix of city and some hwy driving):

5/4 - 143543.3 - 116.1 - 10.9 = 10.7 mpg (pre emissions)
6/10 - 143728.6 - 185.3 - 14.5 = 12.8 mpg (post emissions)
6/26 - 143912.4 - 183.8 - 13.6 = 13.5 mpg

Holy econobox, Batman! :eek: :D Looks like the carb tweaks also helped with fuel economy...

Since inserting the "new" motor, mpg (I record all fillups) has ranged from 10-11 city & mixed, and 12-13 hwy on wheeling trips. Eager to see what kind of mpg I get on the way to the trail on Sunday...

[Wagonforever]

So your getting better mileage after reinstalling your emission equipment? My 90GW which had almost all the emissions equipment removed got much better mileage than my 86GW with all the emissions equipment installed and functioning. My 90 got around 14 mpg mixed driving with a light foot, my 86 has been averaging 10.5 mixed driving. It's now even worse since I replaced the PCV valve. Now I'm down around 9.5 so I'm sure I need to re-tune my carb, but my oil consumption has gone down.

[Topher]

If yer runnin the MC2100 make sure you have an adequit vacuum supply going to the power valve. Mine was getting 8 mpg. I found a loos hose connected to the hose going to the pv and when I connected it the mpg went up to 11.5. I'm tinkering and have gotten this 86 to 12.09 as of this morning. I did have a 258 in an 83 up to 15 mpg. My last wag, an 85, got 13.5. All of these are Waggies.

[sungoesdown]

I have had my Waggy for a couple of months now and finally took a trip long enough to calculate fuel mileage....14.3...mostly highway, went through some small towns

[82 Widetrac]

I just went through my first tank of gas with the fsj. I figured out the mileage on my rig to be at 15.1 miles to the gallon, this is a 80/20 highway/town driving.
Right now it is running rich and still has all of the emissions hooked up. One of these evenings I want to bypass the emissions and tweak the carb then see how all that effects the mileage.

[jeepsohigh]

I took the truck on a longer trip this week and got a solid 10MPG driving 90% highway at about 65mph.

specs are

82 sportside
360 all stock
tf727
4:10 gearing
35x12.50x16.5 tires
I got lots of lookers rolling down the road:fsj: