The higher octane fuel is best utilized by the higher compression engines - it resists pre-detonation better, therefore reducing knock or ping, as stated earlier.
It's almost like the LOWER octane fuels are HOTTER fuels - they are more apt to "auto-ignite" in a high compression engine, like Matt said. Our engines are high compression, just not that high. I'm guessing anything higher than a 10:1 compression ration would dictate higher octane fuel.
Keith
Houston
Ridin'Texas
'04 Speedmaster
AI removed, Pingle, UNI Filter, 1 shim, straight-through slash-cut TORs, Stage 1 DynaJet, 140 mains, 3 turns, 16/42 final drive, 115K
2020 T120 Black
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