GM admits Volt doubts

General Motors has cast doubt over the long-term future of the Chevrolet Volt by claiming it may not be commercially viable and other rivals may overtake it with superior and more advanced technology.

GM submitted a regulatory filing report to the US Treasury yesterday and CEO Fritz Henderson claimed its

The Volt is scheduled for a November 2010 launch, but the GM report claimed that the range-extender hybrid technology may not be fully developed in time to meet this target date. Pre-production Volt models began testing in June.

GM has marketed the Volt as the model to turn the company around, but the report claimed it