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I have a 2002 Silverado 4X4 with the 4.8 and 3.73 gears in it. I usually get 15 in town and 18 or 19 on the Highway. I have not helped my MPG in anyway when I installed a set of 285/75 R 16 All-Terrain tires on it. And to make it that nuch better my foot is really really heavy!! I get way better MPG than ford or dodge. :pain:
 
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