Temperature of an IC engine isn't governed by changing fuel octane...that's not the method you use to change/effect temperature.
Yeah...fuel octane
does effect temperature..but that's not the point of choosing an octane (hopefully the point is chosing the octane that fits your IC engine).
I hope this guy's daughter is a whole lot brighter than he is. ;)
From
here:
'Octane is a measurement of the knocking characteristics of a gasoline...'
So, from that you can figger that the reason a higher octane fuel makes more power is its ability to resist detonation under higher combustion pressures (only partially related to mechanical/static compression ratio) and more advanced spark timing.
Higher octane fuels do burn slower (than lower octane fuels).
From that you can figger that the use of a higher octane fuel than the engine requires will actually make it run
worse!
So...what you want to use is the minimum octane fuel that satisfies the engine's requirements.
What is the
color of the insulator on this plug?
THAT is the way you determine the proper heat range of plug (given that everything else is right..and that's a lot of 'things'...including jetting).
Maybe it just takes you a long time to get the plug wrenched out! ;)
If you want some light reading regarding gasoline...browse through
this.