It is really hard to compare people's mpg claims on these forums because most of the time your talking to someone miles away that drive different trucks, different terrain and many other different factors. The two biggest factors I have seen for my truck's mpg are fuel quality and terrain. I can get 20-22 mpg going down one road that has been heavily used and is pretty much smooth as ice until the surface changes to a rougher texture. Then I may go down to 17-19 mpg. Hills and turns also have a similar effect on mileage. These factors compound with engine load/rpm to lower your mileage.
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