GM and all the other automakers know that 75+ mpg is possible from a light, low drag vehicle with a conventional engine.
(EDIT: a vehicle they are convinced will not sell in large numbers - and they're probably right.)
Quote:
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Dr. Paul MacCready predicted that a car,like the Impact (GM EV1, Cd 0.195) ,if produced as a gasoline-powered car,would achieve upwards of 100-mpg. -- aerohead
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It's easy to find examples of streamlined concept /prototype cars with conventional drivetrains that get exceptional mileage.