Just completed a 790km round trip this weekend. Half way the trip computer was showing 10.8 but when manually calculated after filling up actual usage was about 10. Back home and the trip computer is showing 10.4 which looks like it will equate to 9.6 but I haven't filled up yet. 4 adults, a boot FULL of gear and a/c on the whole time. New Falken 912ZEs at 36psi. Average speed 81.5km/h. On BP ultimate.