I've been preaching about diesel electric hybrids for years. Hybrids tend to excel in city driving, where the the electric motor can kick in and run the car. Diesels are the kings of highway mileage. It seems like a natural match, yet nobody has produced one. I remember reading a while back that BMW was working on one, and I believe VW may be working on one.
As for the the electric motor rear wheel assist in AWD vehicles: Lexus uses this model in the RX hybrid, so it would work for Subaru, if packaging doesn't cause a problem. I think it would greatly help out the Subies.
I believe VW had a concept MKV Golf hybrid that used a combination of a diesel and electric motor.
I haven't heard about BMW's diesel/electric hybrid, but I hear they were working on a car that has two engines, one is a hydrogen-powered one, and the other was either gasoline or diesel, but the point is you use the hydrogen engine whenever you can fill up with hydrogen, but if a hydrogen fueling station isn't available, it can run off the regular motor. Not quite a hybrid in the typical sense, but that's an excellent concept and IMO, what I think is needed to get us off oil. Allow a car that runs on both to give us time to make hydrogen fueling stations as ubiquitous as gas stations, since no one is going to build a hydrogen car when there's nowhere to fuel it, and no one's going to build a hydrogen fueling station when there's no one driving hydrogen cars. It's a catch 22, but I digress.
Does VW meet California Emission Standards??? I know the Golf TDI was not available for sale in CA. They were only allowed if you moved into the state and already owned one or if you bought it somewhere else and then registered it in CA.
My friend's mom has a Golf TDI and really likes it, but be careful because some VWs are known to be very expensive and not very reliable. (new Passat)
I know that the Mercedes BlueTech diesel meets CA standards now but I wasn't sure about VW.
I think in 2006, VW had a Jetta TDI that didn't meet CA standards, and in 2007 and 2008 the Jetta TDIs weren't sold in the states, and in 2009, it's a completely redesigned engine that meets standards in all states. I could be wrong though, I'm not up to speed on VWs diesel lineup. Best thing to do would be to stop by a VW dealer in CA and ask, I hope they would know if they sold them or not
My VW was great. I had no problems, except my Sirius radio tuner crapped out which the dealer replaced under warranty with no hassle whatsoever.