I filled up again today, after a long trip (750 km), and using a +3.0% fuel offset, the SG was still reporting more fuel used (6.68 gal) than the pump read (6.33 gal).
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The 12.6% error just means you have to lower the 8% a little, not that you have to subtract 12.6 percentage points. According to some simple math 7% should be right on if your fillup was accurate.
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Are you sure about that? If I remove the 8% correction from the SG's calc for fuel consumed (8.82 gal., in post #10), then the un-corrected amount is 8.17 gallons (8.82 / 1.08). It's still higher than the actual fill amount of 7.83 gallons. Am I doing it wrong?
I'm going to drop it to 0% correction factor for tomorrow's leg of the trip. I'm still predicting it'll end up needing a negative correction.
I wonder why it has changed from a positive offset to a negative one.