First Australian scorecard of vehicle CO2 emissions reveals best and worst brands | Australia news | The Guardian
— Read on www.google.com.au/amp/s/amp.theguardian.com/australia-news/2021/apr/12/first-australian-scorecard-of-vehicle-co2-emissions-reveals-best-and-worst-brands

…initiative could be further improved with adoption of the newer Worldwide Harmonized Light-duty Test Procedure (WLTP) standard that has been used overseas since 2017 to more accurately measure real-world CO2 emissions.

The FCAI’s current methodology relies on a legislated test called the New European Drive Cycle (NEDC) that was developed in the early 1970s and does not accurately capture real-world emissions. In 2015, the difference between the result obtained in the lab using the NEDC and real-world on-road emissions was as high as 40%.

And Australia has worst in OECD quality standards for fuels.