"87 or 100 octane fuel"
Please let's stay away from this madness and I admit I am one of the subjects who threw oil in the fire...
In order to give an answer though, Blacksix has mentionned it somewhere some 2-3 months ago after having spoken with Luthier:
They do not model the engine so accurately in order to be able to do adjustments of the octanes.
Instead, they create the flight model of a specific airplane according to the historic performance data they have in their posession.
~S~
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