I thought I do some research how fuel consumption are tested... Australian Design Rule 81/01 "The UN ECE Type 1 test, now used to collect emissions and fuel consumption data on new cars in Australia (and Europe), consists of five simulated driving cycles over a total distance of 11.023km. The urban (city) cycle takes 195 seconds. It's performed four times. It comprises 36.9 per cent of the total distance; the extra-urban (higway) cycle, which takes 400 seconds, is performed once. It comprises 63.1 per cent of the distance. The single fuel consumption figure, displayed on the label, is determined by applying these distance percentages to the actual urban and extra urban consumption numbers and adding the two for a final average. The fact that 63.1 per cent of the average is derived from the highway part of the test explains why the figure on the fuel consumption label bears little relationship to how much fuel your car will use in the city. It also explains why the gap between reality and laboratory numbers escalates in proportion to the size of the car and the capacity of its engine. The NISE2 study test devised by the Transport Systems Centre of South Australia is also a laboratory test but it is based on an analysis of actual driving patterns in Australian cities, using a sample of 60 popular cars, GPS tracking of routes, speeds and traffic flows. It's called the Australian petrol composite urban emissions drive cycle, or Petrol CUEDC. The test is a simulated 19.442km course and takes 29.95 minutes. Four types of conditions are simulated: residential, congested, arterial and freeway. Theoretically, it is possible to tailor this test, using the GPS data, to provide specific speed, traffic, road and geography profiles for state capital cities, which would give different consumption rates for the same car in, say, Melbourne, where it's dead flat and they drive as if they're asleep and Sydney, which is relatively hilly and has only two types of drivers: predators and victims." - Liquid Assets (Drive.com.au) The same information can also be found at Fuel Figures (NRMA Motoring & Services) So there we go.. I didn't know that!