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Gm built thousands of 6.2 powered 1/2 ton truck, Blazers, and burbs. The reason my 1 ton 6.5 na only gets 17mpg is because it has 4.56 gears for trailer towing. I had a stone stock light duty 3/4 ton 6.2 2wd pickup w/ 4.10 gears that got 21 mpg all day long.
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