tfltruck.com used identical trucks, a Chevy with a 6.6 Duramax, a RAM with a 6.7 Cummins, and a Ford with it's 6.7 diesel engine and all three (3) towed that exact same amount of weight, and the RAM w/6.7 Cummins had the best fuel economy towing 23,000# @ 70 MPH @ 6.7 MPG The Chevy Duramax 6.6 same weight, same speed was 6.4 MPG @ 70 MPH, and the Ford same weight & same speed was 5.7 MPG, @ 70 MPH. And we're talking about 2017 1 ton dual wheels. So for me, my first choice would be a Super C with the 6.7 Cummins, and then the 6.6 Duramax. The Cummins beat the 6.7 Ford by 1.0 MPG. However, all performed well and as far as decibles, the Chevy was the quietest and the RAM the loudest, but the difference was minimal. This was published on 03/12/2017. Bags.
