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If the race fuel does not contain ethanol, fuel economy may go up on account of that. The rest of the engine probably won't take advantage of the additional knock resistance.
And yes, it IS possible for the ECU to estimate the octane of the fuel. There are many stock ECUs that do just that. You can also calculate the MBT timing using an onboard model.
Assuming the BRZ isn't drastically different from previous Subarus, it is using a very simple timing control system which doesn't model flame front propogation or MBT.
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