My gas mileage totally sucks with 31's on it! It makes the gear ratio too low, so to compensate and gain power I have to shift between 3k and 4k rpm's. I might get maybe 15 to 17 mpg. I dont really mind though as I only use it local and offroad. Has plenty of power at high rpm's. I love my hardbody!
scratch that. had a plug wire loos right when i got the new tires i guess. I had my plug set. anyway after the 2nd one wiggled loos and my check engine came on wooo what a diff...not that big of a diff with the bigger tires...and mpg is up with all 4 cl going