While it appears GM and the big 3 in general aren't going to offer truly fuel efficient hybrids (other than the Ford Escape, but even that isn't stellar) I've been checking into and seriously considering a VW Jetta TDI (diesel) which can easily produce 45plus MPG with NO worries about battery life etc...
The TDI diesel produces the best gas mileage of any non hybrid auto offered in the US. With that thought in mind, I just read that VW has a hybrid in the works, using the diesel engine along with batteries, and preliminary results suggest it will be capable of 65 mpg or possibly higher. That would best the Prius numbers by a long shot and make it the most fuel efficient vehicle in the US. Wouldn't it be interesting if VW suddenly rose to the top of the heap while the big 3 all scratch their heads and try to figure out how to transition from trucks to fuel efficient cars??? (and I own two Chevy's, so I'm not anti GM)
A very interesting concept IMHO, and I'm anxious to see how it works out.
Willy