fuel additives for winter storage?

I use chevron 91 (10% ethanol) no choice in Cali....all gas has the ethanol. I regularly mix Marvel Mystery Oil in my gas to the specified mix. I've done it for years and never had an issue with gas separation or sludge buildup in any of my many vehicles I've had. Learned everything from an old school mechanic. If you run out you can substitute with Automatic tranny fluid. 4 oz to 10 gallons of gas. Upper cylinder lubricant which protects the valves and the whole top end. Keeps the carb from gumming up or corroding. Also adds a lubing quality to today's dry Eco fuels. Keeps the rubber seals and gaskets from drying out and cracking. Remember Lead was used to raise octane, lube the valve seats and lube the innards of the carburetor. Diesels always last longer as they have oil in the fuel which lubes the top end. One place that's lacking with gasoline. Engines always had the head issues and the top end over all. This method helps. I've seen heads pulled with people who used this method and it looked almost new, clean with minimal wear.I also add some to the engine just before an oil change to flush everything. Everyone has their own opinions and methods. I do what I was taught by my childhood neighbor and old school mechanic and racer. It works for me. I also have done this with lawnmowers and edgers and left them sit for months and they start right up. Saved a few as well that sat for a couple of years or more. Dumped out fuel, sprayed out tank with brake parts cleaner. Then sprayed out gunked up carb with brake parts cleaner. Added new fuel treated with MMO to the tank, sprayed out carb agin with carb cleaner and starts right up. Let run a few minutes, adjust carb, and then good to go.