The WLTP has now replaced the NEDC (New European Drive Cycle).
As a tool for predicting real world fuel consumption, the NEDC was very inaccurate with many vehicles burning upwards of 45% more fuel than the NEDC test indicated. Not only was the test procedure a very poor representation of a real world drive cycle but it was very easy for the manufactures to "game" the test.
https://ecomodder.com/forum/showthre...ion-34666.html
So, is the WLTP an accurate reflection of real world fuel consumption?
To answer this question, I have compared actual measured real world fuel consumption for some small engine capacity cars ( all less than 1.25 lit bar the 1.5 lit Mazda 2) to the official combined fuel consumption from the WLTP test.
This data can be found in the chart below.
The last column in the table shows the percentage difference between measured real world fuel consumption - as extracted from
https://www.spritmonitor.de/en/ - and the WLTP combined test results.
It is evident that there is good correlation in the fuel consumption data with the difference being less than 5% for the majority of the vehicles.
At this moment in time, the data would suggest that the official WLTP fuel consumption is a good indicator of real world fuel consumption for most small capacity vehicles on the market.