Collected my 520i 3 weeks ago after delaying for so long. Just filled up my 3rd full tank after 690km of journey with on board screen showing additional 99km more to go. However, while I fill up my 3rd tank, the screen shows 939km available while I remember 2nd tank showed 787km. Why is it so much differences? The first tank is quarter tank plus come during delivery. Also I would like to ask, what is the logo below the fuel comsumption. It supposed to be the average km per hour but after almost 1000km of journey, it increased from 19km to the current reading of 31.3km per hour. Same goes to the fuel consumption reading. It went from 18litre to the current 11.1 litre. Is this normal, especially the average speed reading?