Just did a trip Akl -> Hawkes Bay & back in our '05 v6 Highlander, managed to get down to 10.1 L/10km which I was pretty happy about, 4wd/AT Tyres, 2x people 2x mountainbikes & tonnes of gear. Was being mindful of the right foot though, minimal overtaking etc. Went up once we were there, gravel road adventures etc