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Battery cars are pollution free, energy efficient and have been researched for long now while alternative fuel making use of ethanol fuel cells and hydrogen rather than gasoline but they are still under exploration. Hybrids are a merger of internal combustion engine and electric motor which reduces the fuel consumption. The gasoline engine support provides energy required to recharge the battery. Two of the most popular examples are Honda Insight and Toyota Prius. These cars have given a new dimension to automobiles and at the same time great fuel efficiency.