possibly adjust the cable on the throttle, but as far as the mileage.......its an F-150. they are made to be powerful and hall stuff. You might be able to get away with cleaning the intake or maybe getting a performance jet programmer but i'm not real sure how good your gonna get it. I think they run around like 16 mpg in the city and i think possibly 20 on the interstate. I forget the exact specs but i know they aren't the best. But for getting the work done and taking your 7,000 pound oak desk to the track they can do all day long.