[jfaberna]

I have the 2014 Ram 3500 DRW 6.7L diesel, but with the 3.73 axle gear. I've never really thought about anything related to passing or acceleration. I don't drive it like my GT Mustang, but even then, it has very good acceleration. On a four lane road with stop lights, I find that I pull ahead of all the people in the fast lane who queued up because they guessed a Fifth wheel would not get to 55 fast enough for them. I get 21.5 MPG unloaded when traveling on back roads where 55 MPH is the limit and 11 MPG when towing a full load. It's improved now that I'm at 6500 miles on truck.

BTW, when I tow, I set the Tow/Haul on, the Exhaust Break to Auto and put it on cruise control, even in the mountains. I stay pretty much at the speed limit unless it's 70. 65 is my personal limit for fuel mileage and safety.