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Will there be a noticible difference in performance by using 1 less octane than the 91 suggested?

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1999 Honda Prelude Base 5-Speed. Crystal Blue Metallic.

"Faster and faster until the thrill of speed overcomes the fear of death."
 

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Maybe, Maybe not. I think more than likely, yes, at least if you run it regularly (might not notice it if you mix with a tank of 93).

You should notice it as a loss of power, the knock sensor reports knock to the ECU and you lose the timing advance.
 

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In my 93 SI, i could definitely tell a difference running the mid-grade stuff compared to premium.

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