All good advice.
I would also use desiccants or a dehumidifier in the capsule. I use a dehumidifier in my garage; you would not believe the amount of water that gets removed. The result is really nice, simple things like the brake rotors to not get surface rust.
The idea of having a full tank of gas may come from the desire to remove air that can contain moisture. With current pump fuels you may be better off with a small amount of fuel during storage and getting the moisture out of the area the car is being stored in. Current pump gas starts turning very quickly. Also use a modern fuel additive that is formulated for fuel that contains methanol if you are using pump gas with methanol.
Once winter sets in the humidly becomes much less of a problem, but you still want to control moisture. You really do not want a full tank of old gas unless your plan is pump it out next spring. Even during the winter I like to start my cars once a month to keep the seals in good working order. You may not be able to do this in your location; here in VA we usually get a couple of days each month that are nice enough to start the car. I don’t go out of the drive way if salt has been put on the neighborhood roads.