Thanks for all your suggestions, particularly for the photo of the Stabil label, which states that its stabilizing effect lasts for 12 months.
I already have some Motomaster fuel stabilizer that I have used previously for various gas tools, so I took a look at its label, which I've photographed below. As you can see, it states "for 6 months", which is what I thought I remembered.
This length of time significant because, in order to make absolutely certain that the fuel would indeed be stable for our possibly-7-month winter, I was going to siphon the older 1/2-tank of gas out of the Z's tank, put it into our Outlander for immediate use, then re-fill the Z's tank with Costco's fresh-almost-daily premium while periodically adding portions of the correct total dosage of the stabilizer.
If Stabil's claim of 12-month stability is indeed true, I won't feel compelled to siphon any fuel from the Z, which will no doubt be a hassle. I guess there must be significant differences in the formulation of Stabil versus Motomaster fuel stabilizer and I thought I'd report this to other people living in long-winter locations.
Again, thanks for the help and the opportunity.
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