Our fleet is an anomoly. We have a 2001 Silverado 1500 with 5.3, will get 19-20 mpg on the highway with cruise at 65-70. My wifes 2002 Honda CRV gets 24-26 mpg, not too bad for a 4 cyl pulling a box down the road. My 1953 Studebaker with LS1 and automatic overdrive will get 26-28 mpg. It's the best of the lot! It does want premium fuel though, I suppose I could detune it if I really wanted to. Pretty good when the hot rod is the fastest AND gets the best mileage!

Pat.