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What do you guys with two strokes run for fuel (octane rating)? My motor is a 1978 Mercury 80 hp.

I was advised by local marina to use only 87 octane. They said not use the higher octane rated fuels due to too much detergent. They said timing would be off with said fuel. I've always used premium gas but since switching to 87 octane, I've noticed no difference. What are your thoughts?

Thanks, Dave