The U.S. Environmental Protection Agency is evaluating the impact of higher ethanol levels on vehicle engines and emissions as it reviews a petition to increase the amount of ethanol that legally can blended with gasoline. The petition from ethanol industry group Growth Energy and 52 ethanol manufacturers seeks to raise the limit on the amount of ethanol to be blended with gasoline to as much as 15% from the present cap of 10%. The EPA received the petition last month and has 270 days to ...

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