Pure ethanol has an octane rating of about 113. E85, Which contains 35 percent oxygen by weight, has an octane rating of about

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The octane rating for E15 (15% ethanol) is 88 octane and E85 (85% ethanol) is 108 octane. In addition, as Argonne National Laboratory states, ethanol reduces greenhouse gas emissions between 34 to 44 percent compared to gasoline.
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