Thanks for saving me the time to write this one.

"G.R. Patterson III" wrote in message
...
In my plane, the fuel will syphon out the vents if you fill the tanks to
the
top. There's no tab showing the maximum safe fuel level. I have to caution
any
line person to leave about 1.5" air space, but a lot of them are like gas
station attendants - they want to cram in as much as they can. It makes
one a
bit nervous taxiing for takeoff with a stream of 100LL pouring from the
bottom
of a wing.

George Patterson
Brute force has an elegance all its own.