Chevrolet

The Chevy Volt's 230 composite MPG rating was announced at GM's Tech Center in Warren, Mich. during a news conference Tuesday, Aug. 11, 2009.  (AP Photo/Gary Malerba)
The Chevy Volt's 230 composite MPG rating was announced at GM's Tech Center in Warren, Mich. during a news conference Tuesday, Aug. 11, 2009. (AP Photo/Gary Malerba)

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