I'll add my 2 cents as I have 2 ecodiesels. One is a 2014 Ram1500 with 130k miles. It was stripped of all smog since new and has engine/tranny green diesel tune. I run 285 heavier e rated tires and get 27mpg on hilly windy country roads 60 mph avg. In my hunting grounds I do a 5000 ft elev change on F/S dirt and gravel roads and get 20mpg in 4x4 with avg speed about 20 mpg. This is where it shines. I have had a dozen 3/4 ton diesels, cummins and powerstroke, and went to 1/2 ton once didnt need to tow heavy. 1/2 ton ride is like a cadillac compared to 3/4 ton on and off road. The Ram trucks are basically FIATS and well built.
I bought a new 2016 Grand Cherokee diesel for my wife and now has 60k miles. It gets the low 30's mpg cruising in the 70mph range. We dont do much if any freeways. It is solid feeling, comfortable and crash safe for her.
I would NEVER consider using an ecodiesel for an adventure rig inside or outside of USA. Just to change a waterpump is a 1000 dollar bill with 4.5 hrs of labor! Right now there is a recall on the high pressure pumps and there are none in stock. Last year the turbo coolant hose in my truck sprung a leak. It is the size of an Italian sausage and the cab had to be lifted off the chassis to access it!! It Cost $1860 to change a $60 hose. Setting the outrageous labor bills aside, I would only use an older mechanically simpler vehicle for adventure travel. And gasoline is available everywhere but not so much diesel.
And of course the premium we now have to pay for low sulphur diesel negates much of the fuel economy savings we used to get with diesels. The only thing left to enjoy out of them is the torque.