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One other additive very few truck owners talk about is a biocide. They are used to keep fungi from fouling the fuel and it kills existing growth in the fuel. Biocides are primarily used in boats where the fuel will sit all winter without being used. Although the fuel in our trucks is normally burned much more frequently, I put 1/2 ounce (treats 40 gallons) in my truck tank annually, just in case something is in there that should not be there. I use Biobor JF Fuel Anti-Fungal, found in most marine stores.
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