"Hank Rausch" wrote:

Flew into Nashua last Sunday for business, topped off the tanks right
after setting down. When I came back from business on Thursday, found
the right tank down quite a bit. I was going crazy looking for the
leak and checking the drain for seepage, until the line guy pointed out
that he filled the tank back up exactly 5 gallons--which happens to be
the volume of a standard gas can. He said he'd seen it happen to
another plane on the line, both tanks down 5 gallons.

It was parked pretty much in front of the tower, but it is a low wing
parked in a line of high wings so I guess it made the easiest siphon
target.

I've never given any consideration to gas theft but I think in the
future I will top off right before taking off, as at least thirsty
tanks will make a less attractive target!

That has happened here in AZ, too. Acquaintance with a 421 was down *20*
gallons. It's a gaited airport, but it was at a tie-down near the
self-serve fuel station -- maybe somebody just got confused (har!).
Imagine seeing a twin, or any other airplane, and just helping yourself.
Unbelievable.