[Ryephile]

106 and 112....sounds like leaded. That would be bad.

If the track has unleaded, it's usually 100 or 104. No tune required, it's still gasoline. If you had a map switch in the ECU [for example], then you could have a more aggressive ignition map for the higher octane fuel, assuming the engine isn't already at MBT.

Given that PRAY has found that the stock ignition map is already quite aggressive with 93 octane, a tank of 100 would feel more consistent through the course of the day.