GM makes plant for Volt electric car more efficient, delays plans to add 2nd shift

By Tom Krisher, AP | October 07, 2011 DETROIT - General Motors Co. is delaying plans to add a second shift at the factory that makes Chevrolet Volt electric cars. The company said Friday it has found ways to make one shift more efficient, ... GM makes plant for Volt electric car more efficient, delays plans to add 2nd shift