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)
There's much more to it than the engines. Transmission technology and
final drive ratios play a large role as well.
Heck, I pulled down 28mpg in my 1990 Taurus doing 80mph. The key is to be
light and gentle on the accelerator.
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