I think tonka posted up the impact that bad gas had on his truck over time, I think it made him question doing that again.
As I stated earlier,IMO its takes very little advanced planning to run a tank down to 10/20% of full,either at the end of a weekend or the end of a season. If you end up with a 3/4 tank I expect its because weather surprised you and killed the last weekend or a mechanical failure ended your season early.
I do NOT reuse that 2 yr old stanky gas that comes out of junk ski's I purchase in my truck. I don't need $20 that bad.
But as far as premix is concerned, letting it sit for 60 days IMO is nothing.... add a little fresh on the top and have a great day. But again, even if I plan poorly, I'm at best going to have 1/3 of a tank sitting, and since I'm in Florida, my only excuse for gas sitting more than 4 weeks is laziness/injury. This is different in the North.