How about from a new (March 2015) member who has an 2008 6.7L Cummins with the 68RFE auto in a Ram Mega Cab with 81,000 miles on the OD.
Would I buy a new 2013.5 and up truck in a heart beat. But I would not purchase a 3/4 ton I would go for the 1 ton SRW truck simply because it can tow a lot more that a 3/4 ton and will ride the same.
Now as far as fuel mileage after 20,000 miles the truck engine was starting to improve in mileage took that long to brake the diesel in. I routinely get between 11 and 13 MPG when towing my old 5er a 2010; 318SAB Cougar. I have seven years of data to back this claim up. The newer trucks should get better fuel mileage do to the use of DEF since the truck will be using less fuel for regening purposes. But this will not happen for a couple thousand miles until the engine is broken in.
I am also a member of TDR1 since Nov 2007 my handle is Jim W.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67