Gas price spike driving fuel-efficient auto sales

DETROIT, Mich. -- Rising gasoline prices are driving up the sales of fuel-efficient cars.

That's good news for Detroit automakers, who are finally beating their overseas rivals.

General Motors said in March the company sold 100,000 fuel-efficient cars in the U.S. That's a first for the company.

GM reports demand rose for all of its 12 models that get 30 miles per gallon on the highway.

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