As a student, I would like to interject here with a couple of comments
and questions...
[...] How often do planes have
trouble caused by running a tank dry (NOT running the _last_ tank
dry)?

I would make this two parts - one for =deliberately= running a tank
(not the last tank) dry, and the other for =accidentally= doing the same.

Jose
--
Quantum Mechanics is like this: God =does= play dice with the universe,
except there's no God, and there's no dice. And maybe there's no universe.
for Email, make the obvious change in the address.