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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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