From a short read, it pretty much depends on the blends of fuel you have. If you start with 100 octane race gasoline, then that is your starting point. Blending in different additives with a higher octane rating will result in a higher total octane rating in the final product.

I updated the first post with a little more information.

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GreenBastardPerformance2000 GTP Coupe (the green bastard)
XP, Pacesetters, LS1 TB & MAF,MSD System, P&P LIM, P&P GenV w/ 3.2, 3.0, 2.8, Devil'sOwn Injected 100% Methanol,PowerTuned, TripleEdge Trans w/3.29's
12.92 @ 105mph