Efficiency of conventional vehicles

Only about 15% of the energy in the fuel you put in your gas tank gets used to move your car down the road or run useful accessories like air conditioning or power steering. The rest of the energy is lost. Because of this the potential to improve fuel economy with advanced technologies is enormous.

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Source: 
http://isites.harvard.edu/fs/docs/icb.topic1359598.files/Who_killed_the_electric_car_2007.ppt.
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