MMMM lots to think about here, thanks for all the input here.
Draganof:
Evidently the antifreeze does not evaporate as I thought, But Just for funzies, I am going to boil off some on the stove. As Stan says, it would be a fun experiment and I love science.
Dieseldave:
I like that idea with the soda bottle. I do have a top on the drum to keep trash out and I leave the small bung open to relieve any pressure it might build up from expansion. I just went out and opened the big bung and a soda bottle fits just rite. I have to do a little fenegeling so the wind doesn't blow it out, but that should work fine.
Stan:
As for going to Northern Alberta, I have a friend who has the perfect answer to the cold weather up there ... he comes to visit me for the winter. I will take your word for it.
I did consider loosing some cooling by adding oil to the top of the drum, but I usually have plenty to spare. Last summer unless it was over 100 degrees, I didn't worry about it and then it still had a long way to go between 180 and 200 as it heated up so slow. By the time it got over 180, the sun was going down and the tank was in the shade. This year the tank will be in the shade all day long since I built a shed around Dilbert and the tank is on the north side..
Well, the cat is telling me the dog wants in. Stupid ass dog just stands by the door and whines. The cat goes to the door and howls till I open it for the dog.