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    Help: poor mpg

    Good evening. I have an 08 GMC 2500 HD. Truck has 103k miles 4x4 loaded with all options. It has a superchips programmer and K&N air box. No aftermarket exhaust. Problem is fuel mileage. Sucks.1496 mile rndtrp to Houston pulling a 20 ft trailer and coming back with approx. 1600 lbs truck got...
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