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I also run additive in my fuel. I lost almost 3 mpg when ULSD fuel came out. I got my 3 mpg plus a little more back with the additive. Any failure that is going to happen will probably not surface for some time. The problem is; nobody will know what the LONGTERM EFFECT is on our current motors until the fuel has been out for more than a year or two. I run the additive for my peace of mind.
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