I've also noticed that line folks often leave the tanks less than
completely topped due to the nature of the tanks looking full when they
still have room.

If a tank is completely topped off in the cool evening air, how much gas
will pour overboard when the wing heats up in the noonday sun?

I know - "it depends". Let's take as an example a cherokee 24 gallon
wing, 45 degrees at night, 80 degrees under hot spring sun. Or
something similar. Could one lose more than a gallon per tank?

Jose
--
"There are 3 secrets to the perfect landing. Unfortunately, nobody knows
what they are." - (mike).
for Email, make the obvious change in the address.