Just came back from our first trip of the season and the first time pulling the TT with the new truck.
First, i have to say that going from a gasser to a diesel was the best move I have ever made. I will never go back! This thing pulls like a freight train.
Total trip mileage was just around 150. Total average fuel mileage was 11.2 MPG running 65 MPH. It's a little less than I had anticipated, but it's much better than the old truck. I will admit, I was "playing" a little as well. Interstate on-ramps are no longer a problem.
The engine is very smooth and quiet. The tranny shifts very smooth as well. Tow/haul mode activates the engine brake-although it didn't kick in this time around-no significant downhill grades.
The integrated trailer brake control works flawlessly. It slows the combo as if nothing is back there. When tow/haul is engaged, the tranny downshifts as well to helps slow you down. The tranny will downshift faster also depending on how much pressure you have in the brake pedal.
This is the first diesel I have ever owned. I'm like a kid in a candy store right now. I told my wife on Friday as we were going to the campground that I think I have fallen in love all over again.
Here she is at a rest area (6 year old had to take a "potty break")