In order to measure how much fuel a car consumes and whether it complies with strict exhaust emission limits, all new cars undergo a standardised test procedure. Since September 1st 2017, the new “Worldwide Harmonised Light-Duty Vehicle Test Procedure” (WLTP) has been enforced across the EU for new passenger cars. It follows the NEDC (New European Driving Cycle), which was in use since 1992. The publication of the values from the new driving cycle test has been mandatory for all car manufacturers since September 1st 2018. On this page you will find the most important facts about WLTP and how it differs to the NEDC, as well as information about the EURO 6d-TEMP standard and how it relates to the Real Driving Emissions Procedure (RDE).