Using a higher blend of ethanol and gasoline could damage existing gasoline engines and require the modification of many parts, writes Andrew Morriss, a professor at the University of Illinois. The EPA is considering upping the blend of ethanol in gasoline, but Morriss notes that engines in cars and other devices are not designed for higher levels of ethanol. "Increasing the amount of ethanol required to be blended into our fuel supply is rolling the dice for every existing gasoline engine," he writes.

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