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The top end doesn't need any lube from fuel. Couple that with knowing that oil in the combustion chamber does only bad things, and I think it's prudent to say simply don't add any stuff to the fuel, at all.
You may think one tank did better than another because of it, but tank-to-tank variations are often quite high due to external factors.
You don't even have a fuel log here for us to look at.
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