First off most racing unleaded fuel that is street legal is oxygenated and does run detergents. Also, the point of diminishing return comes into effect here as once you go past 95 octane there isn't that much more to be gained.
However, I remember PencilGeek ran straight 100 octane in his car and dyno'd and ran a 361 rwhp on a dynopack while the car ran 333rwhp with just plain jane 91 octane.
Here's the graph..
Hey PG..hope you don't mind if I used this..
I personally run a blend of 100 octane just to get me back to 93 octane and offset the piss water we get here in Cali.