Not particularly relevant, but on the subject of using the aux tanks I found out several years ago that it's a good idea to stay in balanced flight when near the end of the aux tank feed. I was finishing up a bird survey and nearing the end of the hour on the rear aux tank (had already switched the front back to the main-I stagger them by 5 mins) when the scientist with me asked if I could "do that forward slip thing" so she could take some pics out of the left hand photo port.
As soon as I rolled the plane and fed in opposite rudder, the rear engine let me know it wasn't happy...and neither was my scientist observer!
Joe
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