higher octane lets you advance your timing more.
SO...if you went back to 93, your very expensive 110 octane tune would probably end up pinging/knocking a LOT due to predetonation issues. If the difference between 87 and 91 causes a lot of knocking in a normal car, i would say 110 down to 93 would cause a lot of troubles. Increased tail pipe exhaust temperature, spark plug problems ....etc etc...
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