searched around a bit and didnt really find an answer.
the 5 speed I6 1991 cherokee gets about 17 mpg city.
the tire size is what effects mpg correct?
so if I run 33's on a 4.5 lift what mileage can I expect?

also, can I just keep my stock tires on my 4.5 lift and get decent gas mileage? even though my rig will look ridiculous.

If so, can I still run my stock tires even after a putting in 4:10 gears?

I know thats a lot in one reply. any help is appreciated.

 

33s with 4.5 bout 10 mpg

 

i have 33's with stock gearing and 5.5 inches of lift. mines also 5 speed and i get about 18-20 city and thats doin the calculations with a GPS. also depends on how you drive it and if you use a/c or heater. hope i could help some

 

Stock tires with 4.10s would work except highway speed will have a very high RPM, you will have to launch in 2nd in snow, and it will be easy to do massive burnouts

 

Tire and rim size do have some impact on the gas mileage. It's the extra weight of the tire and axels rotating the wheel that could cause extra gas usage.

Increasing the RPM's and load on the engine does cause the engine to burn more fuel when you increase the tire size.

 

thanks. I want to stay as close to 15 as possible.
Im hoping the 5speed will help by +2
a guy at work was trying to tell me how to rev efficiently.
he said apply as little pressure as possible to the throttle
until it revs all the way to 3000 then shift.
is he an idiot?

 

i shift a 2 grand and get close to 20mpg

 

3" lift, and just 235/75/15, 4.0 AX-15, 3.07's.
I get around 20mpg too.
I towed a Nissan truck home 55 miles each way and still averaged 20mpg.

I don't rev the engine, just accelerate till it feels right and shift, do not lug the
engine around that actually uses more fuel.

I got an XJ without A/C or a Tach so no idea what rpm I really shift at, just go by ear, and exhaust note, straight pipe with only a catalytic converter and in the upper raves it loud and annoying.

 

cool. well I hope I can keep it around 15 thanks for the feedback

 

235/75-15 is what i run on stock lift (til xmas ) and i get around 17-18 city. Once u start goin up in tire size itl def drop. 5spds do a couple mpg better. Id say 30.5/9.50-15 in a 5spd would get u around 13-15 babying it. Good luck man

 

Actually, tire size doesn't affect mpg very much. What makes people think that it does is that tire size directly affects the odometer and speedometer readouts. Larger tires turn slower than little tires making it appear as though the vehicle is going slower and covering less distance with larger tires. If the odometer is corrected for tire size then mpg loss from larger tires is not much.

My '98XJ is a DD and got around 16 mpg when I got it in '01. Now it's on 33s with a 5" lift but the odometer & speedometer have been corrected. It gets only slightly less, around 15 mpg. What made a big difference is when the spare tire was on top. The additional drag knocked off right at 3 mpg so it went back inside the XJ.

hth, Doug

 

I always kind of wondered about the odometer vs tire size. can I just go to a mechanic and have it fixed or where do I go for that?

 

thats honestly the dumbest thing ive heard all year bud... tire size doesnt affect MPG much then huh? so if i ran 60" tires on all stock running gear i guess my MPG will still be the same huh? gears are then worthless? tire size makes a HUGE difference... LIFT does not... your engine is trying to turn a tire that is now twice the weight... has worse aerodynamics... and is not a smooth tire to glide over the pavement as easy as a street tire... funny...

 

Wow, nice flames!
(And I thought we were having a civilized discussion in an attempt to help fellow jeepers!)

 

When I went to 32" tires my mpg went from 16 to about 14. Yeah it affected mpg but not a much as I thought. The tires are much wider and taller than stock but a possible difference was I have steel wheels instead of the heavy stock alloys.

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