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Photos: Concept cars at the 2007 Frankfurt auto show

September 13, 2007 9:48 AM PDT

The ReCharge plug-in hybrid uses wheel motors which get electricity from a lithium-polymer battery, giving it a range of around 60 miles. It also has a small flex-fuel engine that serves as a generator for the battery pack, adding range. Volvo built this series hybrid system into its cool-looking little C30 coupe.

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