Two Senate committees are wrestling over a critical energy policy that influences prices of both fuel and food: the renewable-fuels standard that mandates an increasing amount of biofuels—mostly corn-based ethanol—to be blended with gasoline each year.

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The chairman of the Senate Energy and Natural Resources Committee on Friday questioned whether the United States would be able to meet federal biofuel targets and pledged to take a closer look at the mandate's link to gasoline prices.

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A third key congressional committee has entered the debate over the Renewable Fuel Standard, calling for comment on a series of questions and issuing a "white paper" detailing concerns about the biofuels mandate and some of the proposed solutions for increasing ethanol use.

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