putting a 2 inch lift on but not sure about tire size , how big can you go without killing your gas mileage and power ? my jeep is not an everyday driver yet but wont be long.

 

33s, some will say 35s. From what i understand, the 35" size, depending on gearing, motor and transmission is the tipping point. I'm on 33s with 3.21s on a pentastar and honestly haven't noticed much of a difference in anything. Maybe 1 mpg here and there but nothing crazy.

You want power? Buy a challenger hellcat. You want economy? Buy a moped. Hell buy a moped anyway if you live close enough to work, then you can go nuts with your rig!

 

With 35's and stuff, expect maybe a 3mpg drop. Regearing only made it worse (mileage wise).

 

I run 315 BFG with 3.73 auto and mostly highway and back roads and average 16-18. Some power loss but it isn't that bad. If you are in the mountains it will be different.

 

I'm getting 15.9 on average with 3.8 and manual 3.73 on 33x12.50x17 Pro Comp all terrain, next week she gets new shoes LT315/70R17 Discovery Cooper STT Pro, I'll let you know in a week or two my milage difference

 

It's important to make the distinction if you've got the 3.8 or the 3.6, the 3.8 isn't fond of larger tires and you'll feel it unless you go narrow and tall or all terrain.

 

My 3.8 Unlimited 4.10 gears and 37s is currently getting 11 mpg.

 

3.8 manual with 37s and 4.88s getting 14.5mpg on 93 octane running 93 superchips tune.

 

3.8 auto
UD 60's 5.38 gears
40x1550 Nitto Muds
Superchips Flashpaq
12city 14hwy

 

You can do 315 70 17 easy with a 2" lift. Regear though to like 4.56. Here's mine with that setup