Yes I know this post of mine is apples to oranges, like the op's comparisons he did but here it is.
I have a 2014 Jeep grand cherokee "Limited" Ecoddiesel that is all wheel drive"quadratrac" with off road 2 package and tow package with rear self leveling shocks class 4 hitch.
Same motor as RAM.
My 2500 cummins was in the
shop 38 days the first year of ownership mostly due the the asshats at the epa choking the modern diesels!!
my Jeep has not had issues and will be 3yrs old this
November now 33,600 miles
I am getting 24-27mixed driving and the best so far is 32mpg running 75mph down the interstate.
Last month I had a 4500lb milling machine on my 10k trailer that I pulled from the Pocono Mtns in Pennsylvania to South carolina for a scaled weight of 7100lbs at 65-75 depending on speed limit and got 22 mpg.
Jeep Pulling Deckel FP4MA Slideshow by doctordeckel | Photobucket
This is also very similar load I pulled behind Nissan Titan,Nissan Frontier,Ram 2500.
All of these vehicle got the proper equipment to pull these kinds of loads such as Firestone ride right air bags on the frontier, same trunion square bar 14,000lb wdh.
I intend to buy Green Diesel engineerings tune they have for the ecodiesel ecm computer ,to eliminate EGR,DPF,DEF injection to let the diesel run like it was meant to from design.
This is not a radical tune for HP but does give 2-4 mpg and a better torque curve.
Just my opinion and I am sure yours will vary!