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Fuel Octane

Engine

Vehicle Information: Year: 1996; Engine (Size, Modifications): 3.6L Twin Turbo w/ factory GT2 Turbos and ECU, Fabspeed Muffler bypasses; Total Mileage: 13.900;

Living in the Denver Metro area the best premium fuel that we see is 91 octane at the pump. 100 octane Sunoco Race gas is available at one station in the area. Given the factory settings in my ECU (GT2 setup), at what octane level am I wasting my money if I mix premium 91 octane pump fuel with the 100 octane fuel? Also, any insights into using a small mixture of Toluene (~10%) as an octane booster with the 91 octane fuel to get a ~93 octane blend? I'm told that in small amounts it shouldn't be harmful to the fuel system.

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