In my ponderings for a new 4x4, I keep considering chevy trucks from the 70's or early 80's, whether it is a truck or a blazer or suburban, with a 350 smallblock. However, when researching gas mileage, I get wildy varying reports, anywhere from 6-22. I'm just curious, what kind of real world gas mileage does a 350 really get, if well tuned, maybe some minor engine mods (free flowing exhaust and intake maybe). I would also prefer a manual, it looks like they're all mainly 4 speeds, so I don't imagine gas mileage is better then the auto's then. (better durability though). Also, this truck would be a 4x4, so probably some amount of lift (probably no more then 4 inches) and sitting on 33's. Is it really possible to get more then 16 mpg on a regular basis, if well maintained, or is that just a dream?