General Motors Co. expects to build about 10,000 Chevrolet Volt extended-range electric vehicles by the end of next year and estimates it will produce 30,000 cars in 2012. The production numbers are the first from GM since Bob Lutz told journalists at the Los Angeles Auto Show in December more than 8,000 units would be built in the Volt's first full year of production. The Volt, which can travel 40 miles (64 km) on electric power alone before a small internal- combustion engine takes over as a generator to take the car another 300 miles (482 km), launches in November from GM's Hamtramck, MI, assembly plant. Tony DiSalle, marketing director-Chevy Volt, still expects demand to outstrip supply in the early going. As such, GM will require dealers who want to sell the car at retail to keep a demonstration vehicle on site. "This car is going to be very hot, it's going to be turning very quickly," he says during a Web chat late Friday.