General Motors, Hyundai and Kia debuted alternative-fuel concept cars at last week's Seoul auto show. The Chevrolet Mi-ray, top, is a compact, open roadster with a hybrid powertrain that can run on electric-only front-wheel drive or tap a gasoline engine to turn the rear wheels for extra power. It was developed at GM's Advanced Design Studio in Seoul. Hyundai unveiled the Blue2, a hydrogen fuel-cell concept, middle. The Blue2 -- read "blue squared" -- delivers hydrogen fuel stack power of 90 kilowatts and fuel economy of 82 mpg. Kia's Naimo electric vehicle, bottom, sports an 80-kilowatt electric motor, powered by lithium batteries, that can deliver a top speed of 93 mph. Kia says it can run 124 miles on a single charge.
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