Halekai, there's a small problem with your premise - an empty tank doesn't have any fuel in it.. If what you're saying is correct, over time an empty tank would magically fill itself with water - in practise it doesn't.
Not my premise! It was Pascoe who said that and I merely quoted it! Of course it won't condensate much with no fuel to slow the temperature change..
FWIW I drain my tank in the winter. I also remove my wet exhaust hose and plug the exhaust and air intake.. Overkill? Maybe but I have yet to ever rebuild or even repair the internals, fuel injection pump or injectors of a diesel engine and never had a single drop of physical water in my tanks, so, I think I'll keep doing it..