Don't forget about terrain has a lot to do with fuel mileage as well, flat open ground vs hilly country, The best I have ever gotten out of a truck was my 81 ram stepside with a stock 318 2 bbl, auto, 2.94 gear it got 17-18 hwy at 55 mph.

Last edited by 98RAM1500; 09/27/14 12:06 PM.