A very inaccurate way of measuring consumption.
The only sure way is to fill up at a pump that you use frequently. Fill it till you can see the level take the odo reading Drive it and the fill at the same pump to the same level and read the odo.
That will give you the true consumption.
All these ones who say "I get from A to B on about half a tank so must be getting about 4L per 100Km" are dreaming if they think that's accurate.
I did a trip from Brissy to Coffs and return Carefully filled and recorded figures and got 5.1L per100k , traveling at the speed limit wherever possible. Figures on dash differed. I had to top up in Coffs but did it to the same level it was filled to first.
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