2013 xlt 4x4 screw cab eco 3.55 gears LOVE IT averaging 17.5 interstate ,12 pulling 20' bay boat 70mph cant really expect more . I only have 3000 miles on it. Talk to some others and claimed milage should increase after break in. I guess we'll see! Power is awesome. I think my wife wants to trade her Tahoe for one too.
