Via the NYTimes, the Volt calculations assume that most city drivers will use the Volt’s battery pack, withint a 40-mile range. Because they are “plugged in”, most commuting drivers won’t need the car’s gasoline-powered generator to produce electricity.
Nearly 8 of 10 Americans commute less than 40 miles a day. The key for maximum gas mileage with the Volt, will be to plug it in once a day. Estimates of energy useage are that the Volt will consume about 25 kilowatt hours per 100 miles of city driving.