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Originally Posted by 61BelAir
I don't know what kind of mpg you guys get with your trucks but if I were getting 21 mpg (highway) with my 5.3 i'd be pretty darn happy. As it is right now I get about 16 mpg highway so a 5 mpg improvement would be awesome.
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Agreed, the best I have ever gotten out of mine was just a tade under 17mpg. So if these actually get 21mpg on the highway, which is good for me cuz I don't live in a city, it will be freak'n awesome.