General Motors says that its Chevrolet Volt electric car could get 230 mpg in city driving, making it the first American vehicle to achieve triple-digit fuel economy if that figure is confirmed by federal regulators.

AP reports:
Most automakers are working on similar designs, but GM would offer the first mainstream plug-in with the Volt, which seats four and was introduced at the 2007 Detroit auto show. But when the four-door family sedan hits showrooms late next year, its efficiency will come with a steep sticker price: $40,000. Still, the Volt's fuel efficiency in the city would be four times more than the popular Toyota Prius hybrid, the most efficient car now sold in the U.S.

The Volt will join a growing fleet of cars and trucks powered by systems other than internal combustion engines. Unlike the Prius and other traditional hybrids, the Volt is powered by an electric motor and a battery pack with a 40-mile range. After that, a small internal combustion engine kicks in to generate electricity for a total range of 300 miles. The battery pack can be recharged from a standard home outlet. READ MORE