Nothing about the design characteristics of this engine would benefit from higher octane fuel ( lower flash point ) other than reducing the possibility of pre-ignition / detonation which could certainly occur under high stress and heat, no debate there, if those are the conditions which you’re operating in then go for it.
Otherwise the base tune of the engine control management, fuel injection method etc is best supplied with high flash point ( regular ) fuel. And at these prices nowadays - thank heaven, or Toyota.
Most of my Mercedes and BMW buddies are using mid grade and driving slower LoL.