New tow vehicle...6.4 hemi or Diesel?

I have a 2016 1500 Laramie with an Eco Diesel, the first two and a half years I owned it I swore by this truck. It would get 27/28 mpg and 18/19 towing my car trailer no matter what weight vehicle was on it. Then Fiat got caught in the emissions scandal, had to get the truck reprogrammed by Chrysler now the last 2 1/2 years it gets 20 mpg and 11/12 mpg towing. Now it passes emissions which is funny because it kicks codes with the trailer on the back for to much fuel and turbo boost to high then goes into limp mode and will not go over 30 mph till I erase the codes. That's dangerous on the highway and the dealer says they can't do anything about it because of government regulations. I have lost my shirt on this truck, when I bought it I was in the green in value now I am so far in the red on this truck I can't even afford to get out from under it. One more year and I will probably have to buy a 3to4 year old 5.7 Hemi truck just to get out from under. Never again with the maintenance of a diesel and this experience will I own another diesel, a specially with the tightening emission standards on the new diesels.