Jason Furman, chairman of the White House Council of Economic Advisers, said consumers generally haven't been using the savings from lower gasoline prices to spend on other things. Justin Sullivan/Getty Images hide caption

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FedEx employees sorted through mounds of packages in December at one of the company's facilities in Miami. Consumer spending helped fuel the economy in the third quarter. Gross domestic product grew at a 3.2 percent annual rate (a figure that adjusts for holiday spending to show the "real" growth). Joe Raedle/Getty Images hide caption

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At a Ford plant in Michigan, workers load a battery into a Ford C-MAX plug-in hybrid vehicle. The economy picked up speed in the third quarter. Economists caution, though, that it may slow in coming quarters. Bill Pugliano/Getty Images hide caption

itoggle caption Bill Pugliano/Getty Images