I have a 2016 2500 and pull a 34 ft 8800lb bumper pull plus the usual kid stuff in the box and average high 20’s/100. A head wind really kills the mileage and I don’t hold 110 or even try to going up every hill but I’m happy with mine.
My last truck was 2012 ram 3500 diesel and it averaged low 20’s/100 towing the same setup. The only difference i notice while towing is going up hills. The dodge was far better at that.
In my opinion my gmc is far better in every other aspect.
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