I use it every year in my boat. (2 containers, fill up the tank - less condensation)
I use another product called storage seal. I run it through the engine, after I shut off the fuel until the engine runs itself dry (coats the cylinders & internals with oily film)
Then pour just a little 2 stroke
oil into the fuel injection dist. block.
Loosend the fan belts, change the fuel filter.
Boats tend to be a little more moist and stored outside. Plus the boat engine is 40K to replace and it's too big to paddle if it breaks down in the ocean. It's a minimal amount of work.
I've done it every year I owned it. Never har a break down due to fuel issues. Most boat engine failures are due to bad (old) gas or contaminated fuel.
If your car is garage kept and does not have fuel injection, maybe some of this is not necessary. Cheap insurance....