I don't run any additive. You don't need a thing. Car sitting for a couple weeks is no big deal. One thing not to do is mix pump gas and E85. You can run the tank out of pump gas and then switch over to E85. That's not a big deal. But, mixing them is a bad idea. That is how you get the jelly crap in the fuel system. I run out of the barrel these days since I work from home.
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