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A Hypercar® vehicle is designed to capture the synergies of: ultralight construction; low-drag design; hybrid-electric drive; and, efficient accessories to achieve 3 to 5–fold improvement in fuel economy, equal or better performance, safety, amenity and affordability, compared to today's vehicles.
Rocky Mountain Institute's research has shown that the best (possibly, the only) way to achieve this is by building an aerodynamic vehicle body using advanced composite materials and powering it with an efficient hybrid-electric drivetrain.
Initially, the hybrid-electric drivetrain in Hypercar® vehicles will probably use a specialized version of the internal combustion engine commonly used in today's cars. To reach their full potential, and virtually eliminate automobile pollution, Hypercar® vehicles will be powered by fuel-cells running on tanks of compressed gaseous hydrogen fuel.
http://www.rmi.org/sitepages/pid386.php
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