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Originally Posted by Water Warrior
94 octane in a modern low compression engine would be a total waste of money and lessen your real world power.
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EXCEPT in the case that you noted. Ethanol has less energy density than gas. A 10% ethanol addition automatically means about 4% less fuel mileage, sometimes more.
SO...........
If the price of the non-ethanol grade is LESS than 4% more, it might be an advantage. Since it is a much higher octane, it is highly likely that the price difference will be much more.
Higher octane in an engine that doesn't need it does not automatically mean poorer performance; sometimes it does and sometimes not; it is always more expensive though.