Quadman8 is correct about the power potential of high octane fuel. The octane rating is not a rating on the fuels power potential . It is a rating on the fuels resistance to detonation.
I have not found oxygenated race gas to increase the power more than about 1.5% when the jetting is optimized. I have seen alot of holed and siezed pistons when oxygenated fuel was used and the jets were not right.