Officials with the U.S. Environmental Protection Agency said today the agency needs more time to decide whether to approve an industry request to boost the amount of ethanol blended into gasoline.

The EPA was supposed to decide by Dec. 1 on a petition from Growth Energy and 54 ethanol manufacturers on whether to let gasoline contain up to 15% ethanol. U.S. gasoline is now approved to contain up to 10% ethanol, which in the U.S. is made mostly from corn.

But the EPA said it needs more time to review test data on the effects higher ethanol-blended gasoline would have on vehicles.

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