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Personally I'm very skeptical of off-the-shelf additives and favor stuff that's actually been tested, like engine oil. Modern oils are quite different than oils 20 years ago. You could say modern engine oil has "modern Slick 50" built into it. Every time a new oil generation comes out, it has to go through many strict mandated tests to prove it meets newer regulations, including ones that affect fuel mileage. I'd just use the newest Mobile 1 or something similar and call it a day.
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