Higher octane fuel is a bad idea unless you NEED it.
Didn't read the thread, but to educate others I'll spill the truth.
There is a huge misconception that high octane = high performance. In reality high performance requires high octane.
By definition (in layman's terms) octane is an increment of measurement for volatility of fuel a.k.a "how fast and violent does it burn".
Basically the lower the octane the faster and easier the fuel will burn. Higher octane number means how slow it burns.
Let's go a step further... Compression, timing and combustion chamber temperatures are most defining of required octane.
To put this is very basic logic -- too low of octane and you'll ping. Too high of octane?? Here's the surprise. You'll end up burning a valve due to the slow burning nature of the high octane. The fuel burns too slow and will infact still be burning when exhaust valve opens, causing it to over heat the valve.