Before 2010 came to a close, both General Motors and Nissan launched their respective plug-in vehicles. For GM, it was the Chevrolet Volt plug-in hybrid that made its December debut. The Leaf, Nissan's battery-powered hatch, landed in a lucky buyer's driveway on the 11th of last month. With both automakers making good on their promise to debut mass-produced plug-ins by the end of 2010, the question of which vehicle tallied more total U.S. sales in the month of December can, with a limited degree of accuracy, now be answered.
The Associated Press reports that GM sold somewhere between 250 and 350 Volts in the U.S. before 2011 rang in*. On the other hand, Nissan reportedly sold less than 20 Leafs in the U.S. by the end of 2010. Production volumes for both vehicles will continue to ramp up in the coming months and that's where the real battle lies, but if you're dead set on comparing actual 2010 U.S. delivery numbers, than it's the Volt that outsold Leaf by a substantial margin.
*UPDATE: GM tweeted that the official number was 326.