your right..less octane is best as long as the ping and knock (detonation) not there.
i big mis-conception people have is that high octane fuels make power....THEY DO NOT...the higher octane only prevents detonation...
actually high octane fuel in a low compression motor will slow down ther motor down if anything.
Brian
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "