Great details, Jay; thanks!
Just a suggestion, vectorg: Once you have all your calibrations (speed, fill-up, tank size, etc.) worked out, jot them down -- a small sticker on the back of the Scangauge would be good.
Twice I've had service-related disturbances that reset my Scangauge to factory defaults. If that happens to you and you've recorded the numbers, you can just punch them right back in. Otherwise you'll have to go through another tank of gas and make a calibration run to get things right again.
Unless you have a much better memory than I do.
Rick
vectorg 
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