My 01 is a quad cab, shortbed with 5 speed... I get right around 19mpg and that's all local short trips and I like to get moving fast, not easy on the pedal When stock I got about 17.5, since added 100hp injectors, edge comp(stays on level 5), 4" exhaust and cai. I also run heavy 33" mud style tires. When towing a lot, which the usual haul is up a long steep hill that's a few miles long to take in scrap car, I avg about 17.5 those weeks. Conservatively my truck is 350/850 to the wheels, sure makes a fun driving truck too