An old technology could make hybrid cars much cheaper.
The automakers Volvo and Jaguar are testing the possibility of using flywheels instead of batteries in hybrid electric vehicles to aid acceleration and help engines operate more efficiently. The devices could reduce fuel consumption by 20 percent and would cost a third as much as batteries. Volvo will begin road-testing a car with the technology this fall.
Source: http://feeds.technologyreview.com/click.phdo?i=4306fa3c9b2f4b12fe0be97dd252c46f
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