Same here, the fuel gauge of my 4/4 Sport won't budge the first 100 miles or so at all. Also the needle does not seem to move anymore when ist falls a little below the 1/4 index...

As I keep a drivers log, I know that my average consumption is around 5.2 l/100 km (i.e. 45 miles/US gallon or 54 miles/Imp gallon).

So I usually fill up every 800 km (i.e. 500 miles). That worked fine so far.
best regards from Switzerland :snowgrin: