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Lawrence Ulrich via

Barely a year ago, you could get 40 miles per gallon in exactly one conventional gas-powered car--the two-seat, toaster-size ForTwo, from Smart. But with fuel prices approaching $4 a gallon, membership in the 40-and-over club is growing fast.

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Rebecca Boyle via

Future hybrid cars won’t just have powerful batteries — they will be storing energy in their doors, hoods and roofs. Car parts could serve as capacitors, which would allow for smaller and more lightweight batteries, thus increasing a hybrid’s range.