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I have a 2016 GMC Sierra 2500 crew cab 4x4 with the 6.0L gasser. My truck is a basic work truck with torsion bars cranked, 20x10 Fuel wheels with 285/60/20 Falken Wildpeak AT3's and a Magnaflow cat-back. My truck weighs in right at 7,070lbs empty with me in it (I weigh 230lbs) and 1/2 tank of fuel. With my mixed highway and city driving, I get a solid 12.3mpg all day long. Pulling my 6,200lb travel trailer, I average about 8-10mpg. So I am on par with everyone else. 


That said... this thing rides like a truck. Its rough. Not smooth at all. But it has power, sounds great and is built like a tank. It also handles well honestly. 

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My 07 2500HD gasser with 4.11 rear gears got no better than 14 Hy and 10 City with towing my 6k TT 9-10. My new 17 2500 duramax gets as much as 24HY and 13 City and 11 to 12 towing my new 8k TT.

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