Some vehicles on Australian roads use 20% more fuel than claimed – which models are the worst?

The 2021 BMW X3 had the largest discrepancy of vehicles tested by the Australian Automobile Association. Other makers tested included Audi and Toyota. Photograph: Australian Automobile Association

Cars driven in Australia consume up to 20% more petrol than manufacturers are claiming, according to a program that tests “real-world” on-road fuel efficiency with laboratory calculations.

The Australian Automobile Association (AAA) testing – funded by the federal government – also found four of the 13 vehicles tested in its latest round of compliance checks exceeded regulatory limits for oxides of nitrogen or carbon monoxide.