Diesel is making a big comeback in the automotive industry due to mpg and technological enhancements that make them almost as refined as gasoline engines. Audi's latest clean diesels are exceeding EPA ratings. 40+ mpg luxury cars are going to gain popularity;
http://www.marketwatch.com/story/aud...ive-2013-09-10
A few years ago VW was your only choice for a diesel sedan in North America but now Ford, GM, Mazda, etc are all offering diesel engines in many of their new sedans.