I've just driven 11,000km in my holidays and im still not done, from perth to all capital cities and related explorative driving excluding darwin and hobart. Haven't really been keeping receipts but the computer has been saying 7.7 - 8.1 depending on the weather on the day and aircon usage. Friggen hot at the moment, ac vents running at 1c on the outside vents and -4c on the inside vents on recirc.
Car hasnt missed a beat, hasn't used or lost anything. The old ecotec v6's seem a very reliable engine and its this forum that made me buy one just by the absolute non existance of engine issues reported by VY owners versus VZ onwards. Happy as a pig in sh^t.