Focus Fanatics - View Single Post - anyone using premium gas ?
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Old 05-13-2012, 06:55 PM   #60
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Originally Posted by Power Surge View Post
And the MPG ratings for using E85 are WAY lower than regular gas, so again, no benefit of higher octane.
Ethanol has higher octane BUT lower energy content so when you run ethanol in regular gasoline engine, even ones with 12:1 compression ratio, the lower energy content is what drives the lower mileage -- not the octane.

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