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1997 K3500 454 Work Horse

Not bad at all Tanner for that kind of weight. Was most of that trip on flat ground?
I only get anywhere from 12.1 MPG to 14.5 MPG towing a 4000 pound camper with about 1000 pounds in the truck bed with my 2006 Chevy, 2500HD, 4x4, Duramax. That is mountains and rolling hills most of the way. I think it is the wind resistance that kills the mileage with a camper. The truck does not hardly know its back there as far as the weight other than the camper shakes the truck some when hitting those rough places on the road.

Rolling hills and a 25mph crosswind.
 
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