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The iFCD in my MINI reads about 10% higher than the one in my ScanGauge at this point. The difference has been higher and lower in the past (different calibrations of the SG for different fill-ups), but seems to generally be about 10% higher for the car's display.
The total cumulative MPGs displayed by the car (I have not reset the total MPG readout yet) over ~3200 miles so far is 41.3 MPG. The total calculated by miles traveled/gallons filled is right at 39 MPG.
-soD
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