AP Photo |

Contestant #1?
Tom Stephens shows off the Saturn Vue Green Line Plug-in Hybrid at the North American International Auto Show Jan. 14, 2008, in Detroit. Similar fuel-efficient cars will vie for a $10 million cash prize next year in the Automotive X Prize. In Detroit, the X Prize Foundation issued a call for proposals from cities wanting to host the contest. Five venues will be selected for preliminary runs, which begin in 2009, and another five for the finals in 2010.

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