REFLECTOR: The definitive answer on octane and av-gas

[John Dibble]

When unleaded was introduced in the 70's, the disappearance of high
octane leaded gas was an issue for BMW motorcycles, which had a high
compression ratio.  One fix that was discussed and later adpoted by BMW
was the dual ignition that allowed high compression engines to run on
regular.  I wonder if this same principal applies to aircraft engines?
Is there a definitive way to tell if your fuel octane is too low for
your engine?

John