I would like you to take note of the following blog on the Prius.
http://lapriusacote.blogspot.com/
The first article posted is very interesting. It provides a scientific approach about the discrepancies noted by many Prius drivers, that calculate the fuel consumption by hand to compare it to the reported MFD fuel consumption. The differences reported are in the range of 5-7% average for most users.
The article tries to address the issue scientifically and finding possible explanations to the discrepancies.
What is your discrepancy between calculated and displayed average fuel consumption per tank on the Prius? on other cars you own or have owned?
My current discrepancy based on 60+ tanks over 2 years is about 6.5%.
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