Slideshow: Cars of the Automotive X-Prize

The race is on to build a 100 mpg car. The X-Prize Foundation has ponied up $10 million for the team that can win the race, and prove that their car is economically viable for full-scale production. Check out our slideshow of the hybrids, EVs, and air cars that are making automotive history X.

Listen to the man behind the X, Peter Diamandis, on TreeHugger Radio.


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