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WASHINGTON, DC - Jan. 22: A Chevrolet Volt, an electric concept car, during media day at the Washington Auto Show. It can be configured to run on electricity, gasoline, E85 or biodiesel. (Photo by Scott J. Ferrell/Congressional Quarterly)

WASHINGTON, DC - Jan. 22: A Chevrolet Volt, an electric concept car, during media day at the Washington Auto Show. It can be configured to run on electricity, gasoline, E85 or biodiesel. (Photo by Scott J. Ferrell/Congressional Quarterly)

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