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There is a "filling" error based on the precise point you refill the tank. Which is highly variable. If you keep a spreadsheet of all your fill-ups and average them for a few thousand miles you'll see that the long term difference between calculated and the MPG gauge is between 1-2%. Pretty darn close.

The pre 06 Civic hybrid is reliably reported to be 5%+ "optimistic" (the gauge reads higher than actual).

And of course if you change the tires any difference in circumference (revolutions per mile) will further skew the MPG gauge. And the calculated MPG too since the odometer will also be effected.

HTH! :)
 
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