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My Acura manual says to run 91 PON, but in the US, the grades are typically 87, 89, and 92. Sometimes I'll manually mix regular and premium to get close to the recommendation, but usually I run regular 87.
I can just barely tell the difference between 87 and 92 in the Acura when driving under heavy engine load. There is no discernable MPG difference, but the timing advances slightly more readily with 92.
So, in the Acura, which is designed for higher octane fuel, it barely makes a noticeable difference. Cars designed to run on regular octane probably will not notice any difference.
JockoT- What octane does Honda say to run?
Finally, higher elevations can get away with lower octane fuels since they have lower effective compression. This is why mountainous areas in the US run 85 PON for "regular".
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