As I calculated in my earlier Forbes article, one needs to multiply the EPA MPGe by .365 to get a number that truly compares fossil fuel use of an electric car with a traditional gasoline engine car on an apples to apples basis.

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For driving, no fuel is yet greener in the proper sense of using fewer overall resources than petroleum based gasoline, and we can acknowledge that an electric car is actually coal-powered.

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The results: an all-electric car costs 2 cents per mile, while a gasoline-powered one costs 5 cents per mile.

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Take a 20 kilometers-per-liter hybrid, which is a small car with two engines--one gasoline, one electric--that work in collaboration.

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Although heaters are minimized to conserve battery range, Consumer Reports rated a Volt test car at a paltry average 25 miles of electric-only running before the gasoline engine kicked in under cold Connecticut winter conditions.

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The gasoline engine only turns a generator, which charges the battery and sends electricity to two electric traction motors that drive the car.

ENGADGET: Fisker Karma gets EPA-certified 52MPGe, sales ready to begin