Actually it does help because my mass-air sensor dosnt do what it should...THANK YOU FORD!
At higher rpm's the higher oct fuel dosent pre-detanote with heat, thus once warmed up some it actually will fire better. Ontop of that because I have an EFI with an EEC *fuel injected with a comp controlling it* it puts less in on normal driving because it sences its too rich, but when I romp on it, the timing retards and it puts some more in as it also draws in a buttload of air, giving me more power. Granted I dont have an 11.5-1 compression ratio engine, I dont -need- it but it helps. Muscle heads with carbs for high tech equipment would argue it dosent help, but they know nothing of electronic systems.
Your car does much the same thing, but also you have a very refined turbo system, and with the higher oct fuel, it can take more boost and use the same ammount of gas. The reason being it takes more to burn it so more air into the mixture.
Example *not scientifically correct, but it gets the idea across*
87oct-1,000 parts air
91oct-2,500Air
100oct-4,000Air
so if it leans it way out, you use alot less gas for the same burn.
And on WOT *wide open throdle* you can take alot more air, and thus more power.
Your car -needs- higher oct, and very high dosent hurt, it helps alot
Mine it helps some, no real big bonus really. Maby like 5 hp or something.