I dont leave gas tanks empty, especially with ethanol based fuel running through it.. water separation occurs within a month of non treated fuel.
I just restored an empty gas tank for a motorcycle, it was drained for a couple years but had ethenol based fuel in it prior... it had way more surface rust than I would have expected. This is mostly because it is impossible to get it all out unless you take the tanks off.
Six months untreated is too long IMO for ethanol based fuel. In plastic containers you just dont have much to worry about.
This happened yesterday in Lakewood. Cops had to call in backup units. This is going to be interesting.
I don't bother with stabilizer. I have one 5 gallon gas can for all of the yard equipment; it gets used quickly enough that it needs no stabilization. I also keep multiple 5 gallon cans constantly filled for the generator. I write fill dates on these and every six months or less I dump them into the cars and refill on the same day, so I never have a gap of more than a few hours without my full supply of generator gas. I'd have to do that once a year anyway, even with stabilized fuel, so just save the cost of the stabilizer and rotate stock twice a year instead.
Four to six times a year, I put just enough gas in my generator to run it for 20 minutes or so under load, then run it till the tank is dry for storage.