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My GM Colleagues have gotten around 35 to 40 mpg but I am nowhere near. Not even on highways.. Does having a Chevy Silverado High Country make a difference in mileage? I think not.What is the mileage you guys get from the latest trucks with LZ0 engine? My truck just drove around 1200 miles and came up with a mileage of 25 mpg. Mostly highways. Little disappointed but will watch.