Hybrids
 

I read somewhere that GM has the most fuel efficient engines in the world.
Better than the Koreans, Europeans and Japanese. I don't know how this was
arrived at but I rented a DTS Cadillac and averaged almost 30mpg on the
hiway at around 80 mph. I also know a Corvette gets very good mileage. You
would think that GM would continue development with their "displacement on
Demand" or go with a new fuel instead of the Hybrid which is just a stop gap
at best. (if its even that)

Rob