Among the concept cars on display at the 2007 Tokyo auto show, a substantial number run off of electricity. Some, such as the Suzuki Pixy and the Nissan Pivo2, are a little outlandish. But many represent very serious efforts on the part of automakers to develop a successful and practical zero-emission vehicle. Both the Mitsubishi i MiEV Sport and the Subaru G4e look like they are ready for the road.
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