http://www.autonews.com/apps/pbcs.dll/article?AID=/20101124/OEM05/101129944/1186

Gas-only mpg pegged at 37; total driving range estimated at 379 miles

By Rick Kranz; Automotive News ~ Nov 24, 2010

The 2011 Chevrolet Volt, an innovative plug-in hybrid, received not one but three different mileage ratings from the U.S. EPA today.

On electricity alone, the Volt achieves the equivalent of 93 mpg.

Powered solely by the gasoline engine, the Volt gets 37 mpg.