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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Major automakers asked the U.S. Supreme Court to hear a challenge to the Environmental Protection Agency's decision to approve a higher blend of ethanol for vehicles from 2001 and newer.
The nation's largest motor club says use of the fuel blend, E15, could void car warranties on most cars. More corrosive than traditional gasoline, some studies show E15 may accelerate wear and tear on engines and components.
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.