3 Months Ago, Lyle from GM says (in GM Still Claims Volt Will Get 40 All Electric Miles Both Highway and City, But Under What Conditions?) When GM announced the Chevy Volt should be rated at 230 MPG in city driving, they also divulged another efficiency rating. Pure electric cars are generally rated in terms of kwh per 100 miles to show...
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And Editor from GM FastLane says (in Bob Lutz on the Chevy Volt’s Fuel Economy Rating) General Motors Vice Chairman Bob Lutz weighs in on today’s announcement that the Chevy Volt will get at least 230 mpg (city) using the draft EPA federal fuel economy methodology and will get more than 100 mpg combined (city/hwy.) You can read Bob’s thoughts at ChevroletVoltAge. - Will Stew...

And Sebastian Blanco from AutoblogGreen says (in Chevy Volt gets 230 mpg, but how?) Under the new methodology being developed, EPA weights plug-in electric vehicles as traveling more city miles than highway miles on only electricity. The EPA methodology uses kilowatt hours per 100 miles traveled to define the electrical efficiency of plug-ins. Applying EPA's method...