I have a 2015 Ecodiesel 4 wd crew cab Big Horn 4wd with Ram Boxes
Mixed driving yields 23 mpg over the roughly 25k miles I have driven it. It has a tow package but I have not towed with it yet. I have seen others go 900 Miles on one tank of diesel.
payload capacity is quite limited once you load it with options. I believe my max payload is 1050# and that includes passengers. With 600# of tongue weight that leaves little for me my family and gear.
Here is the best forum I have found.
http://www.ram1500diesel.com/forum/ram-1500-ecodiesel-forum/A number of people have blown up their motors but I have had no issues. Plus it seems like people with issues tend to post on forums. People have been quoted 30k for a new motor by a dealership.
There have also been numbers of water/oil cooler failures which fill the cooling system with oil.
The oil changes used to be brutal with a 10.5 quart change, 60$ filter and Eurospec diesel oil but they changed the oil spec to Rotella T6 which is less expensive.
2017 Production may not have started based on EPA wanting to re-certify most small replacement diesel.
The mileage drop off from 3:55 to 3:91 appears to be minimal so I would strongly consider the 3:91 if you will be towing.
Any other questions ask away!
Thank you!
Kevin