The review from Four Wheeler Network starts out by saying,
After a full day of driving over dirt and asphalt mountain roads, the EcoDiesel gave 19 mpg. This was a bit of a disappointment as the reviewer was expecting a better fuel economy rating. Having the lighter engine up front helped to cushion landings though.Sometimes you get what you expected, and sometimes you get more than you expected, and sometimes you get something other than what you expected. What we got from the new Ram 1500 diesel truck is confusing.
The final verdict?
2014 Ram 1500 EcoDiesel 72 Hour Tow Test - 4-Wheel & Off-Road MagazineWe admit that we had a pretty short visit with the Ram, but we tested it on the highway, towing at max load, in the dirt, and through some twisty mountain roads. The economy ranged from the low teens to the mid 20s, and yet we left the truck with a strange desire to have one as a project truck. Why? Because it really is fun to drive.