Photos: Speedy sports car powered by batteries

The X1's license plate, which makes the car street-legal in California, indicates how it compares in energy consumption with a regular car. The car uses about 200 watt-hours to go a city mile. A gallon of gas contains an energy content equivalent to 33,705 watt-hours. Divide 33,705 by 200 and you get 168.5 miles per gallon. But 170 reads better on a license plate.

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The Wrightspeed X1 was designed by Simon Saunders, who has worked at Aston Martin and Porsche. The heads of the driver and passenger are about level with the middle of a sport-utility vehicle's tires. People tend to react positively to the design, founder Wright said. When he's driving around, people lean over and talk to him.

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Riding in the car, driver and passenger are secured with five-point restraint systems. Minimalism aside, Wright has installed a Pioneer navigation system and a device that captures how many G-forces the car pulls. (During a recent test drive, the car pulled 0.8 Gs going straight and more than 1G in the turns.)

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Air rushing into the airfoil in the back keeps the car's lithium-ion polymer battery cool. The commercial version of the car will likely sell for around $120,000.

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