Quote:
Originally Posted by bigwave2255
the reason i said that the on board computers calculation of fuel economy is incorrect (lie)
is that from personal experience and as has been discussed before in this forum that is the case , it is highly optimistic in its calculations.
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While I accept your information on your own measurement difference, it isn't necessarily a widespread characteristic that the OBC reads out incorrectly. Mine has a maximum error of 0.2 l/100 km, based on filling it each time and measuring mileage. I have checked it on five BMW models that I have owned, and this has been typical. Maybe the diesel model has some additional variable.
There is always the possibility that your fuel pumps are not accurate, unless you use a different one each time and get the same delta.
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