"Thomas Borchert" wrote:

Doesn't leaving the tanks partially empty cause problems with
condensation or something along those lines?

NO! That is another of the many OWTs in aviation
(old wive's tales). Cessna did extensive experiments in
a clima chamber. They could NOT produce any noticable
amount of water in a fuel tank no matter what they did to the
temperature.

Right. Obvious, if you think about it:

How much water is there in 10 gallons of air? In extremely wet
conditions (saturated air at 20 deg. C) there are only 14.7 g/kg of
water in the air. A cubic foot of air at SLP weighs about 34 grams at
20 C, 10 gallons is 13.37 cu. ft., so that gives about 455 g. of air and
about 7 g. of water.

--
Dan
C172RG at BFM