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Quite obviously quietness and “green” are two objectives that seem to be driving the auto scene at the moment. We often see electric vehicles and concepts powered by renewable energy being displayed at various auto shows. Moreover, the rise in the cost of fuel has made auto makers think about possibilities that are fuel efficient as well. When reducing fuel or energy consumption is the need, the best possible solution is to let go of one wheel and make the vehicle run on three wheels. This approach helps aid in better mileage and doesn’t make the user sacrifice on performance and safety. Here are some of the coolest vehicles that run on three wheels for better streets of tomorrow: