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Originally Posted by les j. sachs
87 octane works fine. Here in the Midwest, we can buy 10% ethanol with an 89 octane rating at 3 cents less per gallon. Higher octane doesn't mean better mileage. I get about 3-4 mpg less with the ethanol blend.
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Ethanol contains less energy than gasoline so that makes sense. The advantage of ethanol is that it's renewable.