I came across this article on a new discovery of fuel efficiency which seems like it should get some serious consideration by car manufacturers. In a nutshell it's a discovery by MIT that enables engines to run at a much higher compression ratio using normal gasoline (higher compression requires higher octane or you get knocks) and ethanol. A key feature is that you would need to fill two tanks in your car gas and ethanol, but for 250 percent increase in power that's ok.
http://www.technologyreview.com/read_article.aspx?id=16727&ch=biztech
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