tires, gears and gas mileage question

[Eagle]

 

 

Curious what gas mileage everyone's getting specifically with different tire/gear combos. I have a HO4.0, AW4, 3.55 and 33s and I'm averaging over 16mpg around town. Which I think is pretty good.

Has your speedometer/odometer been corrected for the larger tires?

I swapped it, but it's not perfect still. Its near exactly 10% off (reads slower/lower then actual)

 

so please correct me if I'm wrong. But if my odo is reporting say 160 miles and I've used 10 gal I'm getting 16mpg. Now that reading is (roughly) 10% less so I really drove aprox 176 miles. While still only burning 10 gal. So my true value is closer to 18mpg.

 

 

Correct.

 

Which is, of course, why I asked if the speedometer and odometer had been corrected.

[mikekaz1]

Correct.

 

Which is, of course, why I asked if the speedometer and odometer had been corrected.

Ok, just wanted to double check my theory and math. And Thats why initially said over 16 as that was my lowest physical reading. But it just kind of surprised me because all the other jeeps Ive owned mileage normally goes down significantly. But this has nearly stayed the same even with the high gearing and big tires. As my TJ on 33s gets 14mpg and my WJ on 30.5s gets 17 best. It through me off seeing the MJ get 16-18 on 33s.

[Rockfrog]

Less weight overall helps. Regearing the axles will probably improve it somewhat as well (there is a point of diminishing returns here though).

And FYI - my XJ came from the factory reading 10% lower speeds, so you could say it's calibrated to stock value.

 

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