A guy I work with has a truck like mine - same year, cab/bed and options except color, he's got rear window defroster and his is 4wd versus my 2wd. We've checked our empty mileages, and there seems to be a 1 mpg or less advantage to my truck. We haven't been able to fairly compare towing, since I pull a 5 ton fifth wheel and he pulls a 3 ton travel trailer or a 2 ton utility trailer. Edited by: bluenote