This is a great, well written scientifically conducted post that the engineer in me really appreciates. thanks!
This is precisely why I do not use an alcohol stove, cold weather. People always say they can use an alky stove on the trail just fine, but I have always questioned their true winter experience since I have yet to a) get one to work in the cold, and b) have never seen anyone use on in the cold.
By the way, "cold" to me is below 15F. (It was -1 here this morning with the windchill, and 11 without).