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I have an older (1980?) mercury 20 horse. My buddy told me to use 89 octane instead of 87..... Says, "them old motors run better on higher octane". Is he right? I have heard to never do that in cars that don't specifically call for it so I am a bit leery. Thanks!

Hi there. Been lurking for a week or so and and have been impressed with the amount of help and knowledge available. First, a little background.... soon to be 38, don't know squat about boats or outboards. Live on the Coast of Maine and fish a lot. I fly fish 99% of the time and always on foot...