DETROIT – At the 2007 North American International Auto Show today, General Motors’ head honcho Rick Wagoner unveiled the Chevrolet Volt concept sedan and announced that production work has begun on a new generation of electric vehicles that could eliminate gas stations for Americans who live close to their workplaces. Built on a platform that GM calls the E-flex System, the Volt is a battery-powered electric car that has a range of 40 city miles after a six-hour charge from a household electrical outlet — which would make it a viable, gas-free daily driver for Americans whose one-way work commute is 20 miles or less. That’s 78 percent of all American workers, according to GM car czar Bob Lutz. The car also has a flex-fuel gasoline engine that extends the range to up to 640 miles. The gas engine does not drive the wheels — instead, it creates electricity that powers the wheels. The Volt’s sharp-angle body style evokes current Cadillacs. Lutz said the car proves that “environmentally conscious cars can actually look good, as well.”