Winter Storage Question

The reason for filling the tank isn't to preserve the fuel. it's to preserve the tank. If you don't fill the tank the top half will get rusty again. The 2 stroke oil also helps out in this department. I run a steady diet of 400:1 during the summer and 250:1 for winter storage.

The inside and outside of my 43 year old tank were spotless, execept the top of the inside was rusted to hell. You could see where the fuel level was when the car was stored. Not rusty below the fuel line, but rusty above. Three years later and the inside of my new tank still looks perfect, storing it the way I suggested above.