Somehow I was unaware ethanol is 100 octane. Also found this claim interesting that blending it with gasoline increases the octane rating. Not sure what ratio is necessary to achieve that.
Quote:
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The octane rating (Anti-Knock Index, AKI) of normal unleaded gasoline in the United States is 87. The octane rating of pure ethanol is 100. What's interesting is that when ethanol is blended with gasoline, it performs as if its octane rating is 112, making ethanol a very effective octane booster when used in gasoline.
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https://extension.psu.edu/fuel-ethan...in%20gasoline.