Im driving a pos 99 chevy s-10 with a lot of paint problems and like 20 dents all over the place. No power windows, no ac, etc. Although its reliable and gets alright gas mileage, i'm thinking of upgrading to something nicer.. Im thinking of a regular cab (no backseat) 2000+ sierra, v8. I heard these trucks are solid as hell and can go like 300k. How bad is the gas mileage on these considering its only a regular cab? how much should i expect to pay?