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Vehicles with a first registration after September 1, 2019, will in most cases receive a WLTP calculation. This is the latest method for determining fuel consumption and CO₂ emissions. Due to the increased weight, a commercial vehicle with a double cabin can have higher CO₂ values. This calculation is attached to the GWC or during the second phase of the Certificate of Conformity.
What is WLTP?
WLTP stands for Worldwide Harmonized Light Vehicle Test Procedure. This is a procedure by which all new cars in the European market are tested. Exhaust emissions are measured to see if the car meets the applicable emission standard. Such a measurement is conducted during the type approval of a car.
WLTP is the successor of NEDC. There was quite some criticism on this outdated measurement method. It was said to be totally unrepresentative of the actual use of a car. The criticism was that it was impossible to achieve the consumption figures under normal use. Fortunately, WLTP is much more realistic. The test is much more demanding than that of NEDC, so the CO₂ figures are also higher.
The difference between WLTP and NEDC
One of the biggest differences between the measurement methods WLTP and NEDC is that the latter used one CO₂ emission for an entire family of cars, regardless of the body shape or the addition of extras. WLTP does take this into account. It has tested all engine-transmission variants of each car model in both the basic version and the one with the most extensions and additions. A higher weight leads to additional rolling resistance, which must be included in the measurements.
The influence of WLTP on your BPM
Since July 1, 2020, WLTP has played an important role in your BPM. The CO₂ value that comes from this test serves as the basis for the BPM determination. And as mentioned, due to the stricter tests, this value is significantly higher than the value according to the outdated NEDC. You will generally pay extra BPM for certain options, which make the car, for example, heavier or give it a different aerodynamics.