I just did over 2000 ks in our heavily loaded Puma 110 with four people on board, towing our 1100kg camper trailer, often travelling at 110 km/h on the motorway sections of the Pacific Highway between Sydney and Brisbane, and averaged 13.6 l/100 kmh. I thought that was pretty good good. If I had slowed down to 100 km/h I reckon that would have dropped into the 12s. Unladen, pottering about, it averages about 10.5-11 l/100 kmh. I also think that's pretty good.
2009 Defender 110 2.4. ARB bulbar, Ironman winch, Safari snorkel, Steinbauer chip, Lightforce spots, Long Ranger tank, Off Road Systems drawer, Traxide 160 controller, Tekonsha brakes, Mulgo seat runners, Uniden UHF, Nuggetstuff seat corners, breathers.