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I've got a 92 1500 2wd 4.3L V6 5spd with the 8 ft bed, and I can usually get 20-22 MPG. I keep the rpms low, unless I am hauling a large load up a hill. Mine has the front airdam, which I think helps. I have not tried EOC (engine off coasting) because I am usually hauling a large load and it might be dangerous. I do a lot of coasting with it and slowing down at the top of hills. I never go over 60 mph. I keep the tires at 40 psi. i am about to do a grill block on mine but was hesitant since my coolant temp guage stopped working. These vehicles are not good in stop and go traffic, but get decent economy on rural roads in top gear. I try not to drive mine unless I am hauling something huge. I figure the car gets three times the MPG so might as well take that. One thing you can do if you haul large loads at high speeds is to shape them with the vehicle's aerodynamics in mind. That is filling the box above the top behind the cab and gradually tapering down from there (phil knox style).
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