2015 Toyota Prius Will Be Lighter, More Slippery
 

http://media.il.edmunds-media.com/to..._62512_196.jpg The fourth-generation Toyota Prius, due around 2015, will be made of lighter materials, with a more slippery shape, and will ride on tires with greater rolling resistance — efforts all aimed at boosting the fuel economy of the world's best-selling hybrid car.

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