Not that I'm an expert given the amount of trouble I have with my truck, but a few things that have seemed to help my mileage on a 1997 Sierra is working it hard when it's hot. Cleans the engine out I think. Best I've ever gotten with the Vortec engine(305)is about 22 mpg(imp. gal.) and that was just short trips. I'm sure if the engine would work that way on a road trip it would get 25mpg. ALso find that higher tire pressure helps. I have 235/85/16 (load range E) on the truck and try to keep the pressure around 50-60 psi. For the sake of mileage 235/85/16 are better than 265/75/16. It should have less rolling resistance with the same circumference(actually slightly bigger). If you want good mileage a 6.2 diesel would work with a bunch of work.(only if you seriously need mileage) I put Bosch dual tip platinum plugs in the truck and it did nothing. They likely needed changing anyways though. It doesn't exactly pay to do mileage mods.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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