Wrangler and the Charger/300 would be PRIME candidates. Chrysler as a whole needs to jump on the diesel wagon, VW has already proven its viability time and time again, I would love to see a V6 diesel in the larger cars and a 4-cylinder diesel in both Dart and 200.
Upper 30's to scratching 40mpg in the larger cars with the V6, and upper 40's scratching near-50mpg in the smaller cars would be ideal.
As-s, I'm SERIOUSLY looking at the VW options because no one else makes anything comparable. I'm a Mopar fan at heart, but they don't produce what I want/need so time to go to the next best thing.