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What is WLTP ?

What is WLTP ?

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What do the letters stand for and what does WLTP mean for you?

What is WLTP ?

The WLTP stands for the Worldwide Harmonised Light Vehicle Test Procedure and its the name for the test that decides the fuel efficiency ratings for all petrol, diesel, electric and hybrid cars.

WLTP became a mandatory test from 1 September 2018 for measuring CO2 emissions and fuel economy on all new cars in the EU. In the UK,  WLTP fuel economy values were introduced from 1 January 2019, but CO2 figures were not issued until 1 April 2020 to tally with changes in taxation.

The WLTP replaced a former test which was the NEDC (New European Driving Cycle) which had been running since the 1980s and encountered a fair amount of criticism for being unreliable. 

How do the WLTP figures compare with the NEDC ones?

 

WLTP figures for a car's economy are generally lower than they were under the previous NEDC test because the WLTP test  offers a more realisistic measurement.  The WLTP test don't only relys on laboratory tests but also real-world testing. 

What is WLTP infographic

How does the WLTP test work?

The WLTP test procedure looks identical to the older NEDC process in terms of its laboratory conditions. However that is the only similarities. The WLTP test takes only 30 minutes, where as the NEDC test took 20 minutes, however the whole process can take up to five days, more than double that of its predecessor. 

The temperature is set at 23C in the Labatory. There are also five driving cycles with sharper acceleration and deceleration, and higher average and maximum speeds to reflect modern-day driving like traffic, different speed limits and different road terrains.

In conclustion, WLTP provides a much more accurate calculation of a car's fuel consumption and emissions, which better reflects the on-road performance of the car you are purchasing.