This AP story is a little weird. GM says the Chevy Volt will get 230 mpg. Well, yeah, it runs mainly on electricity, not gas. Publishing miles per gasoline-gallon figures for vehicles that don't run on gasoline is a little off. Golf carts get even better mileage. So do roller blades, bicycles and scooters. They get infinity miles to the gallon. There is a free lunch! "Mileage" figures are great, but only as long as they reflect all the energy used.

WARREN, Mich. (AP) -- General Motors Corp. 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.

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.

GM came up with the 230-mile 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.