First of all most all Marinas I've seen have 89 octane, which is equivelent to mid-grade on the road(regular being 87 octane). At one time I believe there were a very limited number of Marinas selling 93 octane. You might check that out. Anyone out there know? And the problem affects both 2 strokes & 4 strokes. ANYthing that is stored in an off season could be affected.....boats, motorcycles, RVs,lawnmowers, snowblowers, classic cars, home generators, farm equipment....the list is endless. And believe it or not, you can even see a visible change in as little as 3-4 weeks.
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"He who dies with the most toys wins" 
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