On the first tank from the dealer, I did about 800km and decided to fill up because I wasnt sure how much the dealer had put in - no point pushing it. The light still hadnt come on but its quite a way between servo's out my way, and the local is a few cents a litre dearer. Anyway I squeezed 52 litres in waiting for the froth to settle. On that tank light came on at about 930km. To the servo was 1003km!!! Put in another 52 litres - will see how it goes. Trip comp is still reading 5.2lt / 100km which seems accurate based on the amount of fuel I put in. I havent been trying to drive economical at all, aircon going, overtaking trucks and cars, uphill, sometimes reaching 140km/h plus while overtaking. I'm stoked!