During winter (when I'm not snowbirding,) I fill up my 75 gallon gas tank and dump an entire bottle of Sta-bil in it. Then I run both the engine and generator for maybe 10 minits to make sure the Sta-bil is "in the system".
During this (storage) time I go to the motorhome every two weeks and start it up (the generator also) and let them run for 1/2 hour or so.
Keeps the batteries charged, etc., etc....y'never know when you might need it.
What I do...FWIW.