Gas mileage is going to be about what Fitz estimates, maybe with a good tune and carb adjustment with an easy foot might net you more if your normal commute is not the freeway. 3.73 and 70 mph suck gas with those height of tire. No power steering, no power brake from the looks of the pictures. It is my kind of truck but I like it old school and less to go wrong but you have to work to drive it...