With gas prices right around 4 dollars a gallon im a little weary about installing the 3" lift and the 31" mtz's i purchased last week on my 98. i dont know how much the gas mileage will be effected, any estimates or speakers from experience care to share?

 

Lift and tires will drop your mpg's. I went from 17/18 city, 20/21 hwy stock to 14-15/city, 18-19 hwy after putting on 3.5" and 31" A/T's. Best way to keep the mpg's higher is to lighten your right foot. Other things help as well like better flowing (clean) injectors, new O2 sensors, better air filter. All of these give marginal increases, but over time it adds up. But, like I said, the best thing to do is lighten your right foot. Keep it around 2000 rpm's on the highway and during acceleration and you'll see decent numbers for 3" and 31's.

 

Your lucky, I'm getting 14/15 city with my stock XJ

 

Vacuum gauge will help monitor your foot I'm fixing to invest in one

 

don't know what my xj got stock i bought it with 33's on it but switched down to 31's..... i get 13/13... i got the same with 33's.

 

I've ran 31's and 32's with a 3.5" lift and get around 15-17 mpg.

 

use cruise control i learned that out bc i like the sound of my strait piped xj at 3 grand

 

X2 on that, after i got my flowmaster i lost at least 4 mpg, idk what flowmaster does with thier mufflers but it sure made my jeep wanna go fast all the time

 

haha nice gotta love it

 

I'm running long arms with 8in lift 4.56s and 36/12.5 tsls rebuilt 4.0 10k ago and I get 20 in town if I keep my foot out of it gears help so much

 

as far as i know the xj wasnt built for fuel mileage

 

Actually, yes, I believe it was.