General Motors will unveil a plug-in hybrid vehicle Sunday that, the company says, offers a preview of a high-mileage vehicle platform that GM could use in future vehicles.

The Chevrolet Volt, which is driven by electricity alone, uses a small three-cylinder gasoline engine only to recharge its batteries. The batteries can also be charged by plugging into an ordinary electrical outlet.

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GM reveals Chevy Camaro convertible Convertible version of the Chevrolet Camaro debuts. Production version will roll out in 2010. (more)