My Mercedes E250 knocks on all kinds of Hobc from time to time. Blew a spark plug once too, I'll find the pictures and post here.
By the way this testing was performed over a year ago and the only reason I didn't share with anyone is because it is a very crude test but decided to post them here because dayrider requested for them. I had absolutely no idea this whole situation would explode lol.
But from my observations of Honda Knock control over the past 2 and a half years, I can guarantee you that no fuel is 97 RON. From the ecu readings, most hobc are around 90-93 Ron at best.