Article: $10 million quest for a practical 100-mpg car.(USA)(Progressive Automotive X Prize)

Byline: Ron Scherer and Alexandra Marks Staff writers of The Christian Science Monitor

New York -- Drivers often joke their car "is running on fumes," when the tank gets low. Well, how about an engine that actually gets its energy from gasoline fumes?

Or, tired of looking for parking space? Well, someone has dreamed up an all-electric car so thin it can compete with motorcycles for the gaps between SUVs.

And no need to fill up on expensive gasoline anymore - one would-be Henry Ford wants to build an engine that runs on compressed air, the stuff that fills your tires. Naturally, it's called the Air Car.

All of these ideas - some with ...

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