I use Stabil in all my stored stuff, from the scooters to the lawnmower to the generator. Good stuff. Keeps gas fresh for at least a year or so, and perhaps most importantly, helps minimize varnish deposits. The bowl in a carburetors will eventually evaporate, but of course not so with FI systems. I don't bother to disconnect the batteries in the scooters and they seem fine after 6 months.
I first heard about Stabil from a Paul Harvey radio ad many years ago, then asked about it and learned that lots of people use it. I had never heard of it before that.