2011 Chevy Volt - Click above for high-res image gallery

Apparently, we're not the only ones trying to figure out the exact methodology that was used to determine the supposed 230 mile per gallon city rating claimed by General Motors for the upcoming Chevy Volt. In response to a query from the boys at Green Car Advisor, the EPA issued the following statement:
EPA has not tested a Chevy Volt and therefore cannot confirm the fuel economy values claimed by GM. EPA does applaud GM's commitment to designing and building the car of the future - an American-made car that will save families money, significantly reduce our dependence on foreign oil and create good-paying American jobs. We're proud to see American companies and American workers leading the world in the clean energy innovations that will shape the 21st century economy.
Although it deserves noting that GM CEO Fritz Henderson didn't exactly say the 230 mpg rating was an official figure from the EPA, it sure is being bandied about as if it were gospel in the huge marketing campaign launched ahead of today's announcement.

When contacted for comment, GM told AutoblogGreen that the EPA is not backing away from the 230 numbers and that it's unlikely that the EPA will come out with a much lower number when they actually get to run a Volt through the official cycle. Further, GM believes that coming out with the 230 rating at this point in time is one way to change people's perception of what kind of car the Volt is.

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[Source: EPA via Green Car Advisor]