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Until electric cars and their associated technologies (motors, batteries, controllers etc.) become mainstream, the internal combustion engine will need to be further refined in order to meet upcoming fuel economy requirements and current emissions regulations -- while still producing the power that consumers have come to expect. HCCI is one technology currently being developed to make these goals possible, while direct injection and turbocharging are simply becoming quite common.

Tour Coupes are hitting the streets of San Diego. An ingenious concept, the little 2-seater 3-wheelers pull in a GPS signal that activates an on-board narration to describe the city sights. Visitors can rent the 8-foot-long vehicles starting at $45 an hour or $165 a day. The vehicles are registered as a motorcycle and are street legal.

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