Not Ranked
It's very hard to know over noise how close the engine is to ping/detonation. With the inconsistencies in the quality of gasoline, it's not worth the few bucks in savings when the higher octane is just another button to push at the same pump. The inconstancy was told to me by a former VP fuel distributor about pump gas- he had no faith in it.
Remember just because an engine has a low compression ratio does not always mean that it is NOT prone to detonation, it could be the opposite.
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Lou
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