I normally get between 20-22 mpg running 32" tires. When I run my spare set of 31's, mileage increases 1-2 mpg. <img src="/forums/images/graemlins/smile.gif" alt="" /> I'm pretty happy w/ the mileage especially since I got several hundred pounds worth of armor and a full toolbox in the bed. <img src="/forums/images/graemlins/notooth.gif" alt="" />