Running E15 gasoline in a car that is not approved for it could cause engine problems. Ethanol is known to corrode rubber and some metals and can cause additional moisture in the fuel tank for cars that sit for a while.

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Recently, Congress upped the ethanol mandate with two renewable fuel standards: the 2005 Energy Policy Act “required 7.5 billion gallons of renewable fuel to be blended into gasoline by 2012” and the Energy Independence and Security Act of 2007 greatly expanded the program by:

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The AAA says the Environmental Protection Agency and gasoline retailers should halt the sale of E15, a new ethanol blend that could damage millions of vehicles and void car warranties.

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