As far as chevy's go, i traded in my 04 chevy silverado, z71, extended cab, and it always did really good on gas mileage. They told me my ford would be about the same....not even close, its horrible. I have a tonnea cover on mine also, and i don't think that hellped either. It's insane. When a good town is just down the road (45 minutes), I don't even think about driving my ford, i take my little gas saver I bought to drive back and forth to school. The ford costs way to much.