Worldwide Harmonised Light vehicle Test Procedures
It is a globally harmonised standard for determining the levels of pollutants, CO2 emissions and fuel consumption of traditional and hybrid cars, as well as the range of fully electric vehicles.
Mercedes-Benz: WLTP consumption and emission values.
Since 1 September 2017, some new vehicles have undergone type approval in accordance with the Worldwide Harmonized Light Vehicles Test Procedure (WLTP). This puts the vehicles through a more realistic test procedure for the measurement of fuel consumption and CO₂ emissions. Since 1 September 2018, the WLTP has replaced the New European Driving Cycle (NEDC) on a step-by-step basis.
What are the WLTP standards? a more realistic certification - Renault Group
As a general definition, the WLTP is a series of tests required to certify that all new vehicles on the market abide by the new regulations . The objective is to ensure that all vehicles respect the rules on emissions, also called anti-pollution standards.