In late October, Chevrolet’s Volt Unplugged tour stopped outside Redwood in Bethesda Lane. Clean-car fans know the Volt is Chevy’s new electric car, which goes into production soon and will be available in seven markets—including D.C.—in early 2011. The Volt is expected to go between 25 and 50 miles on one battery charge, after which a gasoline engine (with 9-gallon gas tank) will take over.