Mitsubishi is bringing a plug-in electric hybrid to the U.S. in 2015.
But last month, carbuyers could choose from well over 50 different types of hybrids, including seven plug-in hybrids.
But the plug-in technology represents a new wrinkle, enabling the bus to drive several miles on battery-powered electricity alone.
By contrast, Toyota sold just 599 units of its plug-in Prius in April.
JEREMY MICHALEK: We think that current plug-in vehicle subsidies are misaligned with their benefits.
In April, some 7,000 electric cars or plug-in hybrids—Chevy Volts, Nissan Leafs, and Teslas—were sold.
In December 2012, American consumers bought 43,690 hybrids, 7,669 plug-in electric vehicles and 235 cars that run on CNG.
California alone already has more than 100,000 plug-in vehicles.