I have a 2011 GMC 4X4 3500 dully, 21 hwy @ 70 mph and 13 in town, 13 pullin , I also have 5 other GMC's all 4X4's average 19 MPH/ HWY and 13 in town, all of the shop trucks have a 5500 lbs payload min. The only truck I have had problems with is mine, going back in the shop today, lack of power, takes for ever to spool up the turbo
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