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I have seen many references to the Average MPG display being wrong because the Odometer reading / gallons replaced equals a lower figure.
The issue here is that you cannot assume the odometer is accurate anymore than you can assume the Average display is wrong.
Testing is the only way to resolve the issue and that has already been done. The results show the Average display is accurate based on it over-reporting by 2% while the odometer under-reports by a little more than 2%.
From a number of long distance drives performed in the 2011 and 2012 Hyundai Sonata Hybrid, we have shown that the aFCD (averaging fuel consumption display) over reports by 2.0% compared to fuel consumed over odometer miles traveled. Opposing that over report, the odometer/Trip A/B under reports miles traveled by slightly more than 2.0% leading to an overall slightly pessimistic display vs. actual fuel economy. In other words, you receive slightly more mpg
than the display reveals.
Hyundai: Real World Fuel Economy Improved To Meet Expectations, Not a Window Sticker - CleanMPG Forums
The issue here is that you cannot assume the odometer is accurate anymore than you can assume the Average display is wrong.
Testing is the only way to resolve the issue and that has already been done. The results show the Average display is accurate based on it over-reporting by 2% while the odometer under-reports by a little more than 2%.
From a number of long distance drives performed in the 2011 and 2012 Hyundai Sonata Hybrid, we have shown that the aFCD (averaging fuel consumption display) over reports by 2.0% compared to fuel consumed over odometer miles traveled. Opposing that over report, the odometer/Trip A/B under reports miles traveled by slightly more than 2.0% leading to an overall slightly pessimistic display vs. actual fuel economy. In other words, you receive slightly more mpg

Hyundai: Real World Fuel Economy Improved To Meet Expectations, Not a Window Sticker - CleanMPG Forums