New Ram/Cummins vs GM/Duramax on the IKE

rhagfo wrote:
Weel seeing how the engines are about the same and the biggest difference is the GM had the 10 speed and 3.42 (Tall gears), and the Ram had the Aisin and 4.10's (Low gears), I would say the 10 speed in a GM 3500 DRW will get better mileage, depending on engine RPMs. I now turn about 1,500 with the Aisin and 3.73's at 60 mph, our old 2001 turned 1,800 RPMs at 60 mph with 3.55's, so final OD is taller.

Assuming the fuel mileage readings are accurate on these two trucks I would have thought the duramax would have made better fuel mileage but that wasn't the case. It will be interesting when the drw trucks will be tested at maximum capacity