First: the only person around here in diapers is Matt D.
Second: there is no definitive answer on that question. Truth is it all depends on a variety of conditions which all contribute to octane volatility. What works in an n/a engine won't work in a supercharged engine. What works in centrifugals won't work in a roots or twin screw. None of the above will work with turbo(s). Same answer you'll get on that "magic horsepower number with stock connecting rods" question.
It depends. Power adder, engine mileage, plugs, plug gap, fuel pressure, fuel volume, pressure in the cylinders (cams/boost/timing), available fuel quality, driving conditions, and driver common sense. All play a role in how the engine tolerates octane.