That is a very simple explanation of engine vs fuel design. That is why I said, if it works for you be happy. They left some details out. For most, the details will never matter.
In the 118,000 miles I have collectively put on my 2013 & 2015 F6B's I have saved $1242 by using 87 octane.
I did quite a bit of dyno testing years ago and learned my lesson then. If your engine doesn't have enough compression and/or ignition advance to burn higher octane it will actually detract from the performance. Higher octane fuels are made to control detonation and will burn slower.
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