Both of the green autos have been on the market for almost a year now, but only one will stay on the road.
By Alex Taylor III, senior-editor-at-large
FORTUNE -- Americans love a rivalry, whether it is Dunkin' Donuts vs. Starbucks, or the Yankees vs. the Red Sox. So it is not surprising that the simultaneous launch of the Chevy Volt and the Nissan Leaf late last year built anticipation for a MORE