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
Sorry guys, this was not meant for this N/G
Rob
This has been my experience of late as well. I think only Toyota is comparable to GM with respect to engine efficiency.
Matt
I'm just happy I got 30 mpg at 65 mph in my Sante Fe 2.7 V6 :)
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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