It is possible now, according to Newsweek's Fareed Zakaria:
Here's the math (thanks to Gal Luft, a tireless—and independent—advocate of energy security). The current crop of hybrid cars get around 50 miles per gallon. Make it a plug-in and you can get 75 miles. Replace the conventional fuel tank with a flexible-fuel tank that can run on a combination of 15 percent petroleum and 85 percent ethanol or methanol, and you get between 400 and 500 miles per gallon of gasoline. (You don't get 500 miles per gallon of fuel, but the crucial task is to lessen the use of petroleum. And ethanol and methanol are much cheaper than gasoline, so fuel costs would drop dramatically.)
http://www.msnbc.msn.com/id/7037844/site/newsweek/page/2/
This is something to get behind - reduce our reliance on foreign oil and increase our demand for domestic farmer's crops.
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