I ride with him alot and if I don't egg him on he does drive like an old man. I got about 22mpg in my truck (mostly highway with some city and some playing) on the same mileage tune, modified to work with my 71mm Cheetah, 45% injectors, and LBZ CP3. Both of us are still running stock intakes with junk paper filters too(I just installed the LBZ turbo inlet and S&B intake tonight).