Increased biofuel production helped the U.S. slash its demand for imported oil in 2010, according to the Energy Information Administration. Crude imports comprised 49.3% of the country's oil demand in 2010, compared with 60.3% in 2005, the agency said. Increased domestic oil output, more fuel-efficient vehicles and the economic downturn also helped lower the need for imported crude and petroleum products, the EIA added.

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