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In my experience, the Scangauge tends to be slightly optimistic, but only by a small margin, like 3%. Whatever the offset is, it's a percentage and not a constant value. The curve on the chart will not change with calibration, just the scale on the Y axis would change. The most efficient speed will still be 30 kph / 37 mph, it just might be 36 instead of 36.5 mpg.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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