To add to what kenfain said about storage, I will advise you to not put the name brand Sta-bil in it, I've seen it many times on small engine carbs, and v-twin Briggs where the owner added it, and after a month or so, it acts like ethanol, and crystallized inside the fuel system.
At some point with a fresh tank of gas add some Berrymans b12 chemtool.
whenever the Mule started to run rough in previous years, add a bit of it to the fuel tank and cleared it up after a few days driving.