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"The presence of the electric powertrain is intended to achieve either better fuel economy than a conventional vehicle, or better performance. A variety of types of HEV exist, and the degree to which they function as EVs varies as well. The most common form of HEV is the hybrid electric car, although hybrid electric trucks (pickups and tractors) and buses also exist."

"hybrid electric cars and plug-ins concept car that were introduced generally use lithium-ion (li-ion). Now, two companies from Japan, FDK Corp. and Takayanagi Co. Ltd., work together to introduce an electric car with a power source capacitor. a prototype electric car that relies on the capacitor is currently being exhibited at the Next Automotive Industry Fair 2011 that took place on June 15 to 17 in Tokyo."