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I think I had it wrong earlier. If you were using a correction factor of + 8% and the SGII reported 8.82 gallons used, that means that it actually thought you burned 8.17 gallons, and applied your chosen correction factor to come up with 8.82. So based on that you should be using a correction factor of - 4%, which is about what you estimated. So yeah, go with that. As to why the correction factor seems to change, that's a good question. Mine was pretty accurate at + 5%, now it seems to work best at + 7%. Perhaps it is seasonal, I.E. the SGII is unable to account for changes in air density from different temperatures? This wouldn't seem to make sense however since it has access to IAT data. Does anyone know exactly how the SGII comes up with it's fuel usage estimate?
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