EricP wrote:
"vortex2" wrote:
Is there any negative side to running higher octane fuel in your engine?

Yes, you could be wrecking your engine if the compression ratio can't
take the faster burning fuel. In simple terms, it goes bang faster
than lower octane ratings, so the engine must be flexible enough to
take it.

That's the wrong way around, there's enough misinformation around
already. You could say "it goes bang more predictably", I suppose.
Your first sentence would be sort of more correct for lower octane
fuels.