When I did city/suburb driving, I got 10-10.5L/100km. The worst was when I was stuck in traffic jams 3 out of 5 days, I got 12.4L/100km.

When I did Sydney to Melb, I got 6.6L/100km but that was full cruise control all the way. With more throttle, my next Sydney to Melb trip brought me 7.5L/100km.