I don't store much more than 10 gallons of gas at home (diesel fuel is a different story though). 5 gallons in the shed, and 5 gallons in the garage. With that said, the can in the shed is mixed fuel (premium gas and synthetic two-stroke oil) that has been treated with sta-bil, and I've had no problems running it in my two stroke engines even when very old. Last time I used it it had to be well over a year old and it ran just fine.