If you use 100 octane be sure it's not 100 LL (AVGAS) that is used in airplanes.
If you do, you will need to replace both O2 sensors, and replace or gut the Cat/converter. The LL stands for Low Lead. It will kill the sensors and clog the converter.
Higher the compression the faster that fuel burns. It can burn so fast that it will spontaneously combust and act like a hammer hitting the top of that piston. If the burn is slowed down, it will cushion the combustion.
Octane level too low, it will make a pinging sound.
Octane Level to high (100-120) combustion will not be complete at proper degree of crank angle rotation, causing slight power loss.
So the higher the octane level, the more stuff they add to make the burn retard. The more diluted the fuel is, the more it costs us. The fleecing of America?