Xylene also has a high octane rating, and can be bought cheaply at paint supply stores. I used to mix 87 Octane, Xylene and a lubricant (ATF or Marvel Mystery Oil) to make 100+ Octane for the Evo. It worked quite well (but is pretty volatile and smelly to have around in bulk).
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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