To me this is a multi tiered question. Short term storage I do nothing special. All my fuel is treated it goes up on the shelf in the basement (walk out, always temp controlled as we use it as a wreck room as well) I consider this to be 6 to 8 month storage. More or less same applies to the stuff stored outdoors in non temp controlled environment. Now long term storage is anything over 8 months of storage. Double dose of fuel stabilizer, marvel mystery oil in the fuel. Run it out of fuel and fog the cylinder. I've also recently started spraying the snow blowers, tillers, and the like down with PFC to any areas I'm worried about rust or oxidation. Weve done this for years on outboard engines and it's worked wonderfully for us, so I figured it was dumb that I wasnt doing it to my seldom used power equipment. Seems to be helping quite a bit. I do to run from time to time if I'm keeping fuel in them during storage but that doesnt always happen.