Yep. It wont help.
A fuel octane rating is basically its resistance to igniting.
The higher the number, the longer it takes before the burn starts.
Higher octane is used in high compression engines to give a fraction of a second of delay before the fuel ignites.
This allows the cylinder to reach full compression before ignition.
That is why running low octane in a high comp engine causes "pinging"
The low octane fuel ignites before the cylinder is at full compression and before it reaches the correct point in the timing sequence.
The opposite happens when you run high octane in a low comp engine.
The high octane ignites after the cylinder has reached full compression and that ignition happens late in the timing sequence.
And of course these engines were not designed with ethylated fuels in mind so that adds another little kink into the theory
None of the above is true.
Higher octane fuels have a reduced tendency to spontaneously combust - which prevents the last of the charge self igniting when it encounters the pressure wave from initial combustion before it encounters the (too slowly) advancing flame front which should be it's ignition source.