Chevrolet Volt extended-range electric vehicles has outsold Nissan’s Leaf all-electric car for the third consecutive month. GM sold 1,529 Chevrolet Volts in December, up over 1,139 units in November, 1,108 units in October, and a relatively big improvement over the 723 units delivered in September. Sales of the Chevrolet Volt totaled 7,671 units in 2011. […]

