Fans of the Prius are in for a treat: The third iteration of the popular Toyota hybrid comes with some noticeable improvements. For starters, with 50 miles to the gallon, it's now the most fuel-efficient hybrid in America. It's also capable of going from 0 to 60 in 90 seconds. And last but not least, a new roof-mounted solar panel powers an interior cooling fan and keeps the battery charged.

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