Toluene is already an octane component of gasoline. Its actual "blending octane" depends on the actual compounds or refinery streams blended to make the gasoline. Sometimes there are synergies with the components where you get more octane boost than one would simply mathmatically compute, but more typically there is an octane "depression" where the octane of the final blend actually ends up lower than the simple math. For blending purposes, most refineries use a FON (Formula Octane Number) of 103 or 104 for Toluene to take into account the blending depression.
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