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Originally Posted by thinkxingu
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I have a question that I have never been able to get a clear answer on, and it is this: What is better for an engine that the manufacturer recommends runs on a minimum of 91 octane and up? Ethanol free 89 or 90 octane, or 91 octane (and up), regular gas with ethanol in it? Most (if not all), ethanol free gas is 90 octane or less. I can't think of any place that has ethanol free gas with a higher octane than 90. Would love to get a definitive answer to this question. I have stayed away from ethanol free gas for my snowmobiles because of this "gray" area.