The Chevrolet Volt plug-in series hybrid has received an EPA estimated 230 city miles per gallon.about the first 40 miles of driving on a full charge, the Volt uses no fuel. And once the batteries are low on juice, the gasoline generator kicks in to sustain the charge, not to motivate the vehicle--as is the case in parallel and two-mode hybrid. Read more at http://autoblitz.blogspot.com/