WLTP (Worldwide Harmonised Light-Duty Vehicles Test) Explained

The WLTP driving cycle is divided into four parts with different average speeds: low, medium, high and extra high. Each part contains a variety of driving phases, stops, acceleration and braking phases. For a certain car type, each configuration is tested with WLTP for the car’s lightest (most economical) and heaviest (least economical) version. WLTP was developed with the aim of being used as a global test cycle across different regions so pollutant and CO2 emissions, as well as fuel consumption values, would be comparable worldwide.

What is the purpose of the WLTP lab test?

The test has five notable purposes:

Comparison – The test allows the consumer to make reliable and informed comparisons between cars in terms of their CO2 emissions and fuel economy. Only a lab test, which follows a standardised and repeatable procedure, allows consumers to compare different cars.
Official Documentation – Every car produced is accompanied by a certificate of conformity. which includes CO2 values based on the lab test.
CO2 Targets – The lab measurements are used to verify that a manufacturer’s new car fleet does not emit more CO2 on average than the targets set by the European Union.
Consumer Information – To help drivers make a well-informed purchase decision, car dealers and manufacturers provide relevant information to consumers.
Taxation – Most EU member states apply some form of CO2 values from the lab test, which can be found on the car’s official documentation. The results are used to determine the tax applied (e.g. VED in the UK).

What are the benefits of WLTP?

There are many benefits that are a result of the test. The image below demonstrates these benefits:

The 2018 Mazda2 is the first in the Mazda line-up to be tested under the WLTP system, and the upcoming 2018 Mazda6 and all-new Suzuki Swift Sport will have all progressed through WLTP testing. For more information on these models check out our previous posts:

For the Mazda range, all cars that have been tested to WLTP standard will have a “+” next to the trim level (E.g. Mazda 2 Sport Nav+).

Is there anymore information you’d liked to know about the Worldwide Harmonised Light Vehicle Test Procedure? If so, ask us on our socials! We are @twwhiteandsons on Twitter and Facebook. Check out our blog for more content!

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