I posted some this in your other thread on Contacting Ineos:
Excluding heavy duty trucks that are used for heavy towing, I don't think the market case for diesels in the U.S. is very good. Forced induction gas engines now provide a lot of the driving characteristics that people enjoy in diesels (low end grunt in particular), without the hassle of DEF, and the complicated emissions systems in modern diesels. Sadly, (1) diesels have become expensive to purchase (Ineos looks like it will buck that trend in Australia, where the gas and diesel are going to be priced the same), (2) expensive to maintain, (3) less reliable - with a fairly high rate of problems with the emissions systems, and (4) there are other little issues, like dirtier fuel (fueling gloves?), and less availability of fuel in some places. Often, a failure in the emissions can either shut the vehicle down or put it into limp-mode. Its really cold where I live (-5 to -30 F most mornings for 2-3 months). This is anecdotal, of course, but the three guys I know who own a Jeep 3.0 Ecodiesel have had the DEF pump fail (it needs to pump DEF out of the lines upon vehicle shut-down, so the lines don't freeze). When the DEF lines freeze, the vehicle is useless. Maybe they had a production problem that is now resolved - I don't know. Older diesels were dirty, unfortunately, but ran forever. My two buddies with pre-DEF 5.9 I6 Cummins love their trucks, and will never give them up. I know a couple of people who have deleted the emissions systems from their modern diesels, and they love their trucks, but I'm not condoning that...
Of course, diesels still get better mileage than gas engines, and so provide better range (on the same size tank), but that seems to be the only really significant advantage (albeit an important one).
With regard to the Jeep Ecodiesel (since you mention it in your comments): in addition to DEF system problems, these engines are also getting too hot under load. This is a problem of packaging, not the engine itself. The space in the engine bay is not large enough in the Jeep Wrangler / Gladiator to properly cool the Ecodiesel, and when towing uphill, or simply driving up long grades in very hot weather, the engine cuts power to prevent overheating. You should check out this video from "Casey" about problems with the Ecodiesel. Note that Casey is a huge Jeep fan. I think he makes a living making Jeep videos, and he regularly posts videos from overlanding trips with other hardcore Jeepers who have a channel called "
The Story Till Now". These guys are also hardcore Jeepers, and have had the same overheating problem.
https://www.youtube.com/watch?v=_fOrht9_7ww