(http://media.il.edmunds-media.com/toyota/prius/2012/ns/2012_toyota_prius_r34_ns_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.
InsideLine