Sept. 16, 2009

By Jessica Leber

...And Dan Becker, head of the Safe Climate Campaign, said that methods to calculate fuel-economy numbers for plug-in hybrid and electric vehicles are plagued with uncertainties about how people will drive the vehicles.

"You are allowing GM to offset their gas-guzzling vehicles with a few Chevy Volts. That vehicle doesn't exist yet. We have no idea whether people are going 20 miles, 40 miles ... or 120 miles on a charge."
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