2009 GMC Sierra 1500, 5.3, 6 speed, 3.42 - have seen as high as 23 mpg and as low as 12 mpg (towing boat)
Calculated average over the time I had it -16.94 mpg (inlcudes offroad, towing, city).
2013 GMC Sierra 1500, 6.2, 6 speed, 3.73 - am seeing about the same.
21 to 23 on long trips. 16 to 18 mpg city. Haven't towed with it yet.
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