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I bought a 2012 Chevy Z-71 crew cab with a 5.3 engine. I now how 30,000 miles on the truck. I get 20 mpg around town. I took my truck to the beach this summer and I got 23 mpg. I can not complain about the gas mileage. ( I can complain about the price of gas ). I pull a 6 x 12 trailer sometimes and the mileage is still pretty good maybe 18 mpg at worse. There must be something wrong with your truck. I did buy a cover for the bed which I think helps air drag.Report it
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