What does this mean for me as a customer?
The introduction of the WLTP (Worldwide Harmonized Light Vehicle Test Procedure) will ensure greater transparency with regard to fuel consumption. Customers will benefit from the WLTP because it provides a more realistic yardstick for comparing the consumption and emissions values of different vehicle models. However, the new test conditions will also mean changes in the CO2 and consumption values. For process-inherent reasons, technically the same vehicle will have numerically higher CO2 and consumption values under WLTP than under NEDC (New European Driving Cycle). This is because, for example, the new cycle takes account of optional extras and applies stricter test conditions.
The WLTP delivers more accurate values.
As the WLTP takes each vehicle’s particular equipment specification into consideration, its results are more accurate than under NEDC; they are, as it were, vehicle-specific. This alters nothing in terms of previous everyday fuel consumption. From September 2017, a new procedure for consumption and emissions tests is being introduced in the automotive industry; all newly certified vehicle models will be tested under WLTP. At the same time, the NEDC consumption value will continue to be determined and shown as the only valid consumption value in promotional materials. Between now and September 2018, Mercedes-Benz will gradually certify its portfolio under WLTP. From that date, it is likely that the new WLTP values will be shown in all sales documents and other publications. The NEDC consumption will be shown for discontinued models.
Introduction of the WLTP cycle.
The goal of the WLTP is the global harmonisation of test procedures. It is designed to deliver test results that more accurately reflect real driving behaviour than the NEDC procedure. Used vehicles will not be affected by this changeover and will keep their certified NEDC values. Until at least the end of 2020, both WLTP and NEDC values will be calculated for all vehicles. These values will be contained side by side in the vehicle papers with effect from the respective vehicle certification. From 2021, the WLTP values will be the only consumption/emissions values for all cars, provided each EU member state has adapted its tax system. The actual test phases of the WLTP are abbreviated to WLTC, which, in turn, is divided into three classes. Almost every car will be tested under WLTC Class 3, which covers all passenger cars with a power/weight ratio of more than 34 kW/t (46 PS/t kerb weight).
WLTP: Greater transparency.
The WLTP provides Mercedes-Benz customers with vehicle-specific consumption values that are more realistic and more transparent. While cross-manufacturer and cross-model comparability is retained, the measured consumption figures are a more accurate reflection of everyday driving and take more factors into consideration than the NEDC. Mercedes-Benz is an advocate of both new, more realistic laboratory testing and on-road measurements. This ensures greater clarity, transparency and certainty for both Mercedes-Benz customers and Daimler AG. The introduction of WLTP and RDE (Real Driving Emissions) represents an important step in this direction.
What does it mean for the customer?
In future, when choosing their optional extras, customers will be able to calculate the CO2 emissions of their vehicle model more accurately than before. To ensure clarity and maximum possible transparency, Mercedes-Benz will actively follow the introduction phases of the WLTP and provide dealers and customers with targeted information. This will also include a new form of information based on equipment specification: from the model with the lowest energy demand to the version with the highest energy demand. Numerically, the spread will extend from “WLTP Low” (minimum optional extras) to “WLTP High” (maximum optional extras).