it will be about the same as spraying fuel. Toluene is 120 octane (114 by the US system) but it won't raise octane that much if injected in small amounts. And yes, you'll start running quite rich.
Best way to run toluene is to mix it directly into your gas. I run 30~50% toluene (the balance being 100RON pump gas).
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1991 Nissan Skyline GT-R, stage 3 RB27DETT, twin Garrett 2860T-5 turbos...
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