Oilandgasman ...
Thanks for the link to the PDF from Clarcor. Just read it and it doesn't help us understand the behaviour of water in fuel as the temperature drops, other than in a general way.
Clarcor, as you know, make fuel filters and systems for ground based operations - storage of, transport of and re-fueling of aircraft. Fascinating to read that Fuller's Earth is still used as surfactant. Now that is an example of modern technology using knowledge gained centuries ago.
The discussion on microbes in tanks was interesting too.
Regards, Tanimbar