DETROIT -- General Motors said Tuesday its Chevrolet Volt rechargeable electric car should get 230 miles per gallon of gasoline in city driving, more than four times the mileage of the current champion, the Toyota Prius, according to The Associated Press.

GM came up with the figure in early tests using draft guidelines from the U.S. Environmental Protection Agency for calculating the mileage of extended range electric vehicles, said Tony Posawatz, GM's vehicle line director for the Volt.

If the figure is confirmed by the EPA, which does the tests for the mileage posted on new car door stickers, the Volt would be the first car to exceed triple-digit gas mileage, Posawatz said.