“That is true. Why don’t we sell them in the US? Only in Europe”
Diesels are sold HERE by VW (Jetta, Golf, Taureg), Audi (Q7, A3), BMW (335d, X5d), Mercedes (M320d, E320d).
Likely more models coming. (There are a lot more diesel engines in Europe from those companies)
VW has a new model in testing called TwinDrive which is a diesel-electric hybrid.
The current Jetta tdi (2.0 liter) gets 30 mpg city, 40 mpg highway. With hybrid I guess closer to 45 mpg city, 60 mpg highway. It has a 1.5 liter diesel engine.
The question might better be: Why aren’t the Detroit 3, Japan and Korea on the ball?
Hybrids have little to no advantage in highway mpg. Why would you expect a 50% increase?