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Every once in awhile there is a loud fan type noise when charging my i3 Rex. I have to assume it's the fan cooling down the charger or the batteries. It goes on and off intermittently and ceases when I stop the charge. Anybody else experience this? I'm using a 40A, AeroVironment charger.

:?: I don't see very much of the fuel in my Rex being used over the course of a year. Does anybody recommend using a fuel stabilizer to avoid the gas from going bad? Does anybody think it should be avoided?