Save your money, those additives aren't needed, especially they wont help horsepower at all. Engines that have been running OK on the recent past fuel will run OK on the new fuel. A little lower btu per gallon will show up a little in power/fuel economy. Lubricity differences are small to non existent. They were large years back in the first generation of sulfur reduction and that's where problems, including seal swell were experienced. We have to watch out about being sold a "bill of goods" by many additive sellers.
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