Chevy Volt outselling other hybrids

A Chevy Volt is seen in this undated photo.

January 4, 2013 3:18:31 PM PST
Sales of the Chevy Volt are well ahead of its competition, the Nissan Leaf.

General Motors sold over 23,000 of the plug-in hybrid vehicles in 2012.

The automaker says increased popularity in California is driving sales. The Volt is now eligible for that state's sought-after carpool lane stickers.