Compression ratio too high for 91 octane?

Brooks James said

I’ve never seen hard

I have never seen hard evidence of lower engine temps producing more hp, only anecdotal. You may be able to lower detonation and raise hp cool,
But your durability in the cylinder will be compromised and you will definitely have more atmospheric damaging pollutants.

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Ever been to a drag strip? Even been on a dyno? It’s a FACT. Do some research. Cooler engine temps make more power and reduce detonation. Ain’t nothing anecdotal about those facts.

EDIT: coolant temps have ZERO affect on durability. If you think your exhaust pipe emissions are killing the planet to ride a bicycle. You have no clue about what you are saying.