Ok, what's wrong....

[grand_wag_85]

Took the Cherk on a decent road-trip over the last few days covering 500ish miles and pulled a consistant 17.3 MPG's running 75+ MPH with an original 52K mile 360, running rich, unrebuilt TH400 and a non-OD QT.

Um, how?:huh:

[Jeepstress]

Guess the FSJ Goddess took a little pity on you after this summers adventure. :D

Don't get used to it. As soon as you make a mod or a fix it'll all be gone. AMHIK. :rolleyes:

[The PIG Smith]

Do you have larger tires installed?
A larger than stock tire will cause the Odometer to no longer be accurate.
Thus your calulations will be off.

[ohioj20]

Do you have larger tires installed?
A larger than stock tire will cause the Odometer to no longer be accurate.
Thus your calulations will be off.

Bryan, you need to warn us when you change your aviator! Didn't reconize that one! Hey, send me a PM later this week about Sunday.

[grand_wag_85]

Odometer reads faster than what you drive but that's due to the 215/70/R15 pizza cutters, gonna slap my 31's on there until the lift goes on. Anyway, mileage was recorded by the GPS, AVG travel speed 73 MPH:cool:

[FSJ Guy]

Did you sleep through math class??? :D

[The PIG Smith]

Bryan, you need to warn us when you change your aviator! Didn't reconize that one! Hey, send me a PM later this week about Sunday.

The avatar change was requested because of 9-11.
I'll change it back this weekend.
PM Sent

[CustomWag]

Were you running with the back window down? Exhaust fumes will do funny things to your brain:eek:

[grand_wag_85]

'Course I had the window down, but numbers don't lie:p

[The PIG Smith]

Anyway, mileage was recorded by the GPS, AVG travel speed 73 MPH:cool:

Okay...scratch my idea of the Odometer being off!
GPS is about accurate as it gets!

When I know that I will be checking my mileage, I fill the tank right up to the neck, where I can see the fuel. (to point of overflowing)
I do this when I start and then when I end my trip.
This way I know I have a known amount of fuel to calculate the MPG with.

So, if your distance numbers are precise (with a GPS, I would say they are)
then the other variable to question would be the amount of fuel used.

The reason I bring this up, is that FSJ fuel gauges are notorious for failing.
None of the fuel gauges in my rigs work.
Also, when folks, most of us here, install larger tires, the odometer is off.
Without accurate data, then calculating fuel economy is guess a best guess.

I dunno what you received so high numbers.
Especially with a rich running carb.

Instead of asking why...could you take another trip and repeat the results?

[mattmopar440]

What Octane are you running????????

[grand_wag_85]

What Octane are you running????????

85 test. Should be taking it on another trip sometime over the next month or so, want to put my Edel carb& intake on there but I'm affraid to touch it.

[mattmopar440]

IF it aint broke DONT FIX IT:D

[CougarCJ]

Is the GPS set on miles or kilometers?:confused:

Lets see, 2.2 Km per mile. Do my goes-intos, and .... 7.86mpg. LOL:p

[Serious Johnson]

Actually, a GPS will read a wee bit low for any terrain within a 250-mile radius of Breck, since it calculates distance using only lateral and not vertical factors. Those shorter than stock tires will cause your indicated mileage to read high -- I'm guessing 9 or 10 percent without actually doing the math. One of the larger vairiables, particularly with a Wag's tank/filler layout, is level of fill. The only fuel mileage figures I count as reliable start & close on the same pump, facing the same direction, filled to overflow, "burped", and overflowed again. Doing it this way, the highest I've yet recorded in the Colorado High Country was 19.6 MPG, though I've run several tanks less rigorously checked that returned 20-22. This is with 4" lift, 33s, 3.73s, and about double the 360s original power, but it's also with a manual trans and fuel injection at high altitude. I never got close to 17, or even 14 when my Wag was stock.

S.J.

[Gambler68]

you guys still use your odometers?!!


seriously..

:o

lesson learned when I was in the land surveying game..applying new nuts-zero accurate measuring devices to 'old timer' estimates always ends up being wrong. We get 10mpg. Anything better and count yourself lucky, anything worse and it's your fault for laying into the 4barrel. :thumbsup:

[Serious Johnson]

you guys still use your odometers?!!


seriously..

:o

lesson learned when I was in the land surveying game..applying new nuts-zero accurate measuring devices to 'old timer' estimates always ends up being wrong. We get 10mpg. Anything better and count yourself lucky, anything worse and it's your fault for laying into the 4barrel. :thumbsup:

Way back when I taught surveying at the local community college, the "aha moment" came to most students when they realized that they could use crude instruments that couldn't be calibrated extremely precisely, traverse a mile or so with multiple setups, and still close within a hundreth of a foot. Trick is in recognizing and opposing error (the recognizing part is hardest).

I'm still trying to figure out how the forty corners on my Colorado mining claims were set in 1879 when access to some of them requires a rather sophisticated technical climb even with modern gear & technique.

S.J.

[richard567]

Do they still have that suff ;) :D

[Gambler68]

Way back when I taught surveying at the local community college, the "aha moment" came to most students when they realized that they could use crude instruments that couldn't be calibrated extremely precisely, traverse a mile or so with multiple setups, and still close within a hundreth of a foot. Trick is in recognizing and opposing error (the recognizing part is hardest).

I'm still trying to figure out how the forty corners on my Colorado mining claims were set in 1879 when access to some of them requires a rather sophisticated technical climb even with modern gear & technique.

S.J.


Good point. I loved land surveying..hated the math. And being a rodman sucks (I made it to junior party chief in 4 years and burned out before I really knew anything ;) )

[steven79]

Four years ago when i was makeing mulipul trips between houston and tulsa with my 79 wag i was getting between 16.4 and 16.8 regularly with gps, speedo was 12 to 13 mpg at agout 65 avg speed with stock size tires. now might get 3 to 6 with the tranny fubard.

[HeyNels]

Are you sure you weren't driving a different vehicle? If not, your jeep just became one of the most-coveted on the list. Congradulations!