Quote:
Originally Posted by mrf0151
Excerpt from Rex Energy on Ethanol content in gasoline:
Frequently Asked Questions
Does 93 Octane Have More Ethanol Than 87?
Yes. 93 octane does have more ethanol than 87. There is a common misunderstanding that ethanol is present in lower amounts in higher octane gas. In reality, it contains more.
Although pure ethanol has a minimum octane rating of 100, it behaves as though it has a value of 112 when combined with premium gasoline. Ethanol is used more, not less, in higher-octane mixes like Esso’s 93 and Petro Canada’s 94.
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There’s a difference between adding ethanol to boost octane and adding 10% ethanol to all blends. 10% is 10% whether it’s 87 octane or 93.
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