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      01-25-2013, 07:48 PM   #11
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Drives: 15 F36 420D GC MSport MPerf
Join Date: Apr 2006
Location: Norway

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Originally Posted by Dabaitu View Post
Not. The time period for the OBC measurement is different to the JC measurement, hence the difference.

The Owners Manual isn't overly detailed on this point:

Average fuel consumption
This is calculated for the period during which the
engine is running.
The average fuel consumption is calculated on
the basis of various distances.

So what's giving the discrepancy is likely the OBC and JC measuring different time periods, giving you the different result. Does this make sense or have I completely missed your point?
It's all about the JC and the drivven distance and the average speed per hour. In my mind the drivven distanse and average km/per hour should be equal when I have been driving for exactly 1 hour after reseting of the JC.