Posted for Jim Sower <canarder@starband.net>:

If you have a tail dragger, it's tough to get an accurate reading.  The only place
you could measure accurately would be the center (fore and aft) of the
(symmetrical) tank.  Small asymmetries would have small impact on accuracy as would
small departures from the center of the tank.  Measuring from the end of the tank
would be of little use unless you calibrated your dipstick for that position.
Just a theory .... Jim S.