Ram 2500 Cummins the most fuel economical

steelpony5555 wrote:
Newer the truck the worse the MPG....If you can find a nice Dodge 5.9 it will get the best fuel mileage....even a 3 Gen 6.7 Dodge is not too bad...buy a 4th Gen 2014 and the fuel mileage will go in the crapper....

Just a minor correction, for RAM, 2007 to 2012 don't get very good fuel mileage. 2013+ with the new DEF emissions strategy and far more passive regenerations will get very good mileage, pretty much pre-emissions level fuel economy or even a little better. I've pulled just a hair under 22 mpg with mostly highway driving. I think I could had done better if I was driving on flat ground versus mountain passes and having to get around slower drivers when passing lanes present themselves.