What Are NEFZ, WLTP And RDE?

NEFZ ("Neuer Europαischer Fahrzyklus") New European Driving Cycle describes a dynamometer measurement that has been used in Europe since 1992, to determine the exhaust emissions and fuel consumption of passenger vehicles and light commercial vehicles.

The NEFZ has been replaced by the world wide test method WLTP ("Worldwide Harmonised Light-Duty Vehicles Test Procedure"). The new procedures should show a more realistic picture of the consumption of a vehicle and is based on a different test cycle with stricter inspection requirements.

In addition to WLTP in Europe the emissions should also be determined according to the RDE test procedure ("Real Driving Emissions"), in which the measurement is taken in traffic conditions.