In all, GM has sold 1,210 Chevrolet Volts in 2011 or 1,536 units since launching late last year, including 608 deliveries in March. Nissan, meanwhile, has apparently only sold 471 Nissan LEAFs in the U.S. since launch.
GM had originally planned to sell the Volt in only select areas of the country before 2012, but the automaker announced that it would expand sales of the Volt to all 50 states by the end of the year.
Nissan has said 20,000 people have put down $99 deposits to be put on a waiting list for the car.
[Source: Nissan, GM]