<font color=blue>...What keeps the fuel in your home heating tank from gelling up?</font color=blue>
Darned if I know. I presume they do the same as the diesel truck stops. They just change the blend as the season changes. The problem is, the tank sits unused the entire summer.. which makes me think it might be a tad stale by the time cold weather comes around. The furnace doesn't seem to mind, but the tractor might. I dunno.