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For everyone who wants to know how fuel efficient electric and hybrid cars really compare to gas-powered vehicles, the EPA has released two fuel-economy label proposals that would translate electricity usage into an equivalent in miles per gallon.

Have your calculator and utility bill handy if you're keen on buying a Chevy Volt (or Nissan LEAF) and want to compare fuel costs with gasoline cars. The EPA is still grappling with how to provide consumers with ratings comparable to the familiar MPG labels.

GM has finally put a sticker price on its much anticipated plug-in electric hybrid. Granted, a hefty federal tax credit will defray the cost, but the Volt carries a premium price. GM's challenge now is convincing consumers the Volt is worth it.

Enterprise Rent-A-Car plans to buy 500 electric cars from Nissan Motor Co (NSANY) as part of a strategy to make the vehicles more widely available to renters. Enterprise Holdings, which owns the brands Enterprise, Alamo and National, will include the Leaf vehicle in its rental fleets in eight...

Some 115,000 people have signed up at Nissan's website to get more information about the all-electric Leaf compact sedan, which goes on sale in December. Users can also sign up to be the first to own one of the zero-emission vehicles.