Hello all, I have a 1989 F350 Crew Cab long bed, 7.3L without turbo, no dually, 4.10 posi, 5 speed, NO COMPUTER onboard. I get 16mpg around town w/o trailer all the time. Can get 20mpg on the road empty. Approx. 11 towing 34' AS. Has 263K+ without cracking the engine. Hunter knows my truck. Lawrence