Air your tires up properly.Keep your foot out of it.dont work it more than you need to per situation.take any crap out of the bed that doesnt need to be there.Make sure your brakes are all in good shape and not dragging and thats about it..me personally i drive trucks for a purpose.I have a truck as my DD and it does EVERYTHING i ask it to so in return i dont mind the non car like gas mileage as it is a truck.For good mpg you want either a small engine (5.3) or so or a car.....
2000 Suburban 3" lift and some power mods..The daily
06 impala SS CAI,Exhaust,pirellies the other daily
86 camaro Far from stock......The hot rod
1992 camaro RS 25th anv 350 5 spd..The cruiser