Larry,

moisture to condense out of the 40 gallons of air contained in them,
will result in enough water in the fuel system to interfere with
operation of the aircraft's power plant.


Says who? Please elaborate your calculation, which I cannot at all
follow.

AFAIK, Cessna once tried real hard in a climate chamber to produce a
noticable amount of water in an aircraft tank. Didn't happen.

--
Thomas Borchert (EDDH)