BEHIND THE WHEEL VIDEO - CNBC

That's the fuel economy GM expects the electric Chevy Volt to deliver when it comes out late next year. The company made the announcement this morning in Detroit and already skeptics, fans, and the general public are debating if the Volt's mega-fuel read more-->

The number's significance, Mr. Henderson said, is that the Chevrolet Volt plug-in car due later this year is expected to get city fuel economy of at least 230 miles per gallon, or 25 kilowatt hours per 100 miles. That performance, based on fuel read more-->