Ram 2500 Cummins the most fuel economical

I am not sure what you want. You have recieved some very good info from the members here in regards to your threads. They have covered your questions from the Tundra all the way to the HD trucks. The new trucks are so close in overall performance that the only thing one has over the other in todays market is your personal preference on its looks and interior. So there you go, drive them and see which one you personally like best.

I'm thinking it depends mainly on the driver technique and speed. I get 12 mpg +/- .5 mpg towing the fifth wheel in my signature with a 3/4" GMC 6.6 Duramax.

I'm very non-aggressive and tow at 60 mph on interstates and less than that on 2-lane.