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I also use 87 octane in my Johnson 2 stroke. Everytime I fill the tank I too put in a few ounces of Sea Foam. If you have the manual for your engine put the octane in that is recommended. I was told also that two strokes don't like all of the detergents in higher grade gasoline and also that these engines are sold all over the planet and in alot of third world countries they don't get different grades of fuel. Probably lucky they get 87 0ctane at all. Also in times of no use fill your tank all the way,add Stabil and you should not get any or very little condensation in the tank. Good Luck!