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Kai Ryssdal: More on that announcement from GM yesterday about its new electric car, the Chevy Volt. Everybody — including yours truly — picked up on the amazing mileage number GM says the Volt will deliver: 230 mpg.

Well, I refer you now to the more mathematically literate bloggers over at Environmental Economics. They deciphered GM’s numbers for the rest of us. Turns out you can only get that 230 mpg for a trip that lasts exactly 51.11 miles.