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My dad just replaced his '04 awd Denali with an '07 Tahoe LTZ 4wd. With the truck in 2wd at 75-80mph it is only getting 13mpg. My brother's '07 Avalanche also gets about 13mpg on the highway. At 70mph the truck averages around 17mpg. My dad's denali used to get 15mpg at the same speeds and his...