I'm getting ready to store my Camaro for the winter and want to make sure I do the right things. Obviously I'm going to wash the car and put a couple of coats of sealant on (Blackfire). But what's next? Should I fill the tank with Gasoline or is it better to leave it as close to empty as possible? What about a fuel additive? I have the Flatstoppers ramps so I don't need to worry about flat spots. Anything else?