Well, i have been offered a trade for my 86 k10 chevy. A guy wants to trade me a 1989 chevy 3500 crewcab dually with a 454 and 75000 miles. what do these trucks get for gas mileage? Also, what do you guys think of these trucks? I will be adding a 6" lift and some 35s if i get it. how do they tow? i will still have my 91 dodge cummins, so i can always tow with that.