[Cub Cadet 123]

I have too many cubs to run at the same time and some of them I haven't had out of the garage for a little over a year. However, I do try to start them every now and then. With that said, I was wondering what is the best way to store them, concerning the gas tank.....should I (a) store it with a full tank of fuel as manufacturer specs state (kind of worried with the modern fuel and its shelf life) or (b) store it with no fuel in the tank. I have used Sta-Bil and Marvel Mystery Oil on my cubs on a regular basis.

Thanks in advance for entertaining my question.

Cub Cadet 123