Either fill the tank to the brim so their is no air space, helps minimise moisture absorbtion BUT you will still get the ethanol seperating out after a month or two (shelf life of current fuel is pathetic).
Or drain the tank which can then still rust a little but only very light surface stuff.
Ideally when the tank is empty and clean coat the inside with ethanol proof expoxy then you don't have to be concerned that the bottom will fall out of it
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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