The good news: The rising price of gasoline in the United States has made American car shoppers sit up and take notice of fuel-efficient hybrid gas-electric autos. The bad news: Carmakers still can't keep up with the demand.

For example, Toyota recently announced that it would double production of its Prius hybrid to meet the rapid spike in U.S. consumer demand. But even with approximately 50,000 more Priuses headed for American shores next year, Toyota admits that shoppers will still need a lot of patience.

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