mileage ??'s

[vbrown99]

Ok all, I'm new to Jeeps, but I GOTTA ask...
Why does the mileage on a 88 GW suck so bad? I've been driving full size trucks for years and have never seen such lousy mileage (10-11). My pickup (350 V8) gets 19mpg, my 69 Scout 800 (also Chevy 350)gets 16mpg. Can I do anything to get the mileage up to about 15? Carb? ignition? a sail?

Thanks all!

Mike Brown
Aurora, CO

[Bernie]

I think your best option is either a sail with a good stiff wind or a small block chevy. I use my 350 powered Studebaker truck in the nice weather . It gets good milage compared to my Wagoneer

[River Beast]

10-11 mpg.... how I wish I got that!!! http://www.cs.colostate.edu/~zeimet/ubb/biggrin.gif The only time I got that good is when I drove her home limpin'(blown axle u-joint) from place of purchace.. she got an average of 10 for 525 miles.. she was all stock then with 78k.... that was in July 97. Now I get about 6-8... and I can't complain. They have the aerodynamics of a barn door and way as much as a yacht... but you gotta love 'em. The addiction is VERY poerful.

The best I've seen here is from TPIguy who has custom TBI on his rig and averaged about 15mpg on a road trip... THAT'S AWESOME There are some tricks out there to boost it a little but the TBI setup seems the most noticeable.

------------------
Todd
78 Wagoneer "River Beast"
360/TH400/QT
Dana 44's locked w/ 4.88's
soon to be 38x14.50 TSL- SX Swampers
7" SOA in front-7" Rear Shackle Inversion Mods
4" Skyjacker Softride
3" Trailmaster Bodylift
My FSJ site: http://www.geocities.com/~spazz4life (http://www.geocities.com/~spazz4life)
My E-mail: spazz4life@yahoo.com
"If you can't stop...SMILE as you go under!"

[Manhattan]

I get 13mpg in my 1988 V8 GW - $3,500.
I get 16mpg in my 2000 V8 GC - $39,600.
I got 4mpg in my 1979 V8 CJ - $1,200-14,000?
I got 14mpg in my 1996 V8 Discovery - $36,000.
I got 15mpg in my 1994 V6 Trooper - $28,000
I got 30mpg in my 1993 V8 Crown Vic' - $23,000
I got 31mpg in my 1991 V8 Crown Vic' - $19,000

All of these are based on highway driving in excess of 70 mph... Hey look! The Crown Vic' with great aerodynamics and highway gearing got great mileage! Kinda sucked off-road though.

My GW's 13mpg seems like pretty good mileage considering I've gotta spend another $33,000 to get 3mpg better.

There are no V8 SUVs that get significantly better mileage than a GW. I've heard stories of Tahoes getting 19 mpg.. Bull $@it. Okay, maybe downhill at 50 mpg in February, empty...

------------------
a.k.a."Bushwood" '88 G-Wag' New 360, 3" Springs, 31"s, Custom Roof Rack... rest stock.

[This message has been edited by Manhattan (edited October 09, 2000).]

[Treadted2]

Well, I gotta brag. I measured my gas mileage yesterday, and... (drumroll)... 15mpg!! This is totally stock, zmax additives and a k&N filter. I am totally stoked. I expect it to get better also because I just put the Zmax in and they GARAUNTEE at least a 10% increase in mileage after 30 days. I also plan on putting in MSD ignition stuff and upgrade the exhaust system to hi-flow cat and muffler. We shall see.

Ted

[Narnian]

The "barn" aerodynamics and heavy weight of your FSJ (designed circa 1960) are not suited to great mileage. Adding fuel injection and keeping it well tuned will help. A clogged cat will kill your mileaage too. There are a lot of other bells and whistles for lowering fuel consumption, but they are not generally very impressive or cost effective. Some are outright nonsense designed to lighten the load in your wallet.

[Veepster]

i don't even bother to check mine....

and mileage can only get so good.......the 360 eats 360 cubic inches of air per revolution and that needs enough fuel added to make 14.7 to 1 ratio between fuel and air. and then you have to push the beast through the air......


------------------
Peace.............BartG

the Green Flash!
78 Chero
360 2v, 400 QT with low

4" skyjacker
33x12.50 BFG KO's
Thorley headers, 3" exhaust
Infiniti power leather seats
50%LuxuryCar,50%Tractor

[bigbry]

hey Manhattan how do you get 13mpg!!!

[MonsterMash]

Your Scout (and your p/u) are both about a ton or so lighter than an FSJ (Wag/Chero). Is your p/u 4x4 ? All of my friends with new full-sized 4x4 p/u s get around 14 mpg. One friend of mine who has an older Chevy 3/4 350cid/4v gets about 8 mpg.

As you suggested, a sail may help but it's hard to tack at highway speeds.

Hey Manhattan, did your Crown Vic have a V8?

------------------
'84GW360--"Spinner"
And on the eighth day God created Jeep so man would not be bored.

[RudyC]

OK first I noticed we all STILL have the motocrp 2V carb. It's not a good design. Powervalves are less precise that the meetering needles of a Q-jet or an AFB. Second the ventries are Huge compared to a the before mentioned carbs. Does anyone know the CFM rating of the motorcaraft?
I had a modified Quadra Jet on mine for a while but because the intake I got was a non emmisions model I hhad to take it off for the smog inspection. I would pass with the Q-jet if not for the intake (no EGR). The VERY, VERY few times I did not drive on full afterburner mode I got way noticable milage. I didn't calculate it to get the numbers but $10.00 at the same stations got me to and from the same route from home to but station (12 miles round trip) TWO EXTRA TIMES with the Q jet.
Of course on good ten second burst in afterburner mode guzzles about 2 gallons of 91 octane. This emmisions gasoline we are forced to use makes it worse. I made several trips between LA and Vegas and they still had the regular non California gas and I got improved milage comong from Vegas that going.
AFBs and Edelbrok carbs that are not set up for economy rather than performance wont get much better milage either and all aftermaket carbs are set up on the rich side for protections sake and need to be jetted to the engine for best economy. Holleys are the less precise power valve also and generally are too rich for good economy.
And then theres the old delapitated emmisions junk. All those bad EGRs leaking hoses and old Catolitic converters and not good for economy.
Did the chevy 350s you say had better milage have Q jets?

------------------
AKA RUDY79.
1979 WAGONEER, 360, TH400, Q- TRAC. 3" ADD A LEAFS, 31" MUD T/A'S (PEP BOYS CLONES).
" Go farther, it only breaks on the street"

[Manhattan]

BigBry: new 360 & I go a lot slower - I'm the guy in the right lane that you pass and say "hey that was a sweet Grand Wagoneer... Where, I missed it"

MonsterMash: Both 'Vics had V8s a 5.0 in the older one, a 4.6 in the newer. btw: very fast for a big sedan.

------------------
a.k.a."Bushwood" '88 G-Wag' New 360, 3" Springs, 31"s, Custom Roof Rack... rest stock.

[This message has been edited by Manhattan (edited October 10, 2000).]

[vbrown99]

Is your p/u 4x4 ? All of my friends with new full-sized 4x4 p/u s get around 14 mpg. One friend of mine who has an older Chevy 3/4 350cid/4v gets about 8 mpg.

Yup, my pickup is a 93 4x4 Silverado with 108,000 miles. I've got a K&N filter on it, a super chip, throttle body riser and 33" tires. Ok, the mileage is actually 18.5, I exagerated a bit, but it's constant from tank to tank. I average 520 miles on about 28 gallons (30 gal tank). I also put prolong in it and fuel system cleaner.

Mike Brown
Aurora, CO

[vbrown99]

Did the chevy 350s you say had better milage have Q jets?

Nope, I don't like Q-jets, PITA to work on. The Scout has a Holly 600/Vac secondary and the pickup has FI (93 silverado). Both are 4x4.

[RudyC]

YES PITA to work on but once dialed in they worked great. The Holley is a good carb, I had on my Ram charger and it worked ok but it wouldn't pass emmisions inspection and was very sensitive to off road bouncing, also i just got tired off fuel spilling on my motor when i needed to set the jetting. The vacuume secondaries have a lot to do with the economy you had. Since it only opened upon engine demand rather than foot operated so if you stomp it they would only open up when the vacuume signal was higher and the engine needed it.
Unfortionatley I live in CAlifornia so the Holley WILL fail the smog check and it's not certified for an AMC, they are certified for Chevies and Dodges. The inspector sees its a holley. On the other had the Q jet was just another Q jet so they don't catch it.

------------------
AKA RUDY79.
1979 WAGONEER, 360, TH400, Q- TRAC. 3" ADD A LEAFS, 31" MUD T/A'S (PEP BOYS CLONES).
" Go farther, it only breaks on the street"

[RudyC]

Well fuel injection is another thing altogether (Mustangs and F-16s).
My point is the stock carb is too big, too all around, and cant be adjusted as precisely as the carbs with mixure needles for best fuel economy. You can jet it on the lean side but that hurts performance.
You can spend the $$$$ on fuel injection for a 360 AMC. or as I did $20.00 for a good Q jet and tune it good. If I had the money for the EFI I would first convert my Waggy to a Chevy motor because there are a ton of EFI options for it.
The money for an EFI buys alot of gas.
Whats on the Jeep now?


------------------
AKA RUDY79.
1979 WAGONEER, 360, TH400, Q- TRAC. 3" ADD A LEAFS, 31" MUD T/A'S (PEP BOYS CLONES).
" Go farther, it only breaks on the street"

[Bryan Niese]

<BLOCKQUOTE>quote:</font><HR>Originally posted by MonsterMash:
Your Scout (and your p/u) are both about a ton or so lighter than an FSJ (Wag/Chero). Is your p/u 4x4 ? All of my friends with new full-sized 4x4 p/u s get around 14 mpg. One friend of mine who has an older Chevy 3/4 350cid/4v gets about 8 mpg.


<HR></BLOCKQUOTE>


I just sold my 1998 F150 4x4 longbox, 4.6 litre fuel injected V8, LT265 tires, 3.5 gear ratio & auto w/overdrive and I got 19 mpg on the highway (16 around town)and I do not have a light foot-I drive 70-75 mph. I dont know how much it weighed. Gawd I love fuel injection!

------------------
Donzi
1988 GW
Totally Stock