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USA Today - February 26, 2012

Significance of the Data
Chart shows 2012’s most fuel-effi­cient vehi­cles by EPA esti­mat­ed mileage
For all elec­tric Mit­subishi i-MiEV and Nis­san Leaf, con­ver­sion fac­tor used to trans­late miles per gal­lon gaso­line equiv­a­lent
Chevy Volt runs on gas and elec­tric­i­ty