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I recommend against recalibrating the ScanGauge every tank. It doesn't "learn"; it just uses the most recent offset you entered. The SG may be off more for some types of driving than for others. Instead, set it to 0% offset. For your next ~5 full tanks at 0% offset, record gallons at the pump, odometer reading, SG gallons used, and SG miles driven. After 5 tanks, add up the numbers in each category. Figure out if you need to adjust the SG miles driven offset. Then adjust the SG offset for gallons used based on the amount you actually filled up with. This approach should average out inconsistencies and give you better accuracy on average.
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