Eric, they do get 18 mpg highway. Considering we drive the GP and the Hummer about 10 miles a week combined its not an issue
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The silverado has 176000 miles in it I got it in late 2011. First transmission went out at 90k miles. Gms new 6 speed autos are junk. I empty the gas tank every other day. So about 1000k a month in gas in that lol
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