Frequently asked questions:

1. What is WLTP?

WLTP stands for the Worldwide Harmonised Light Vehicles Test Procedure. It is a replacement for the New European Driving Cycle (NEDC) test. The test covers emissions and consumption values for vehicles.

2. What is the difference between the NEDC test and the WLTP test?

Both test cycles are carried out in lab conditions. The WLTP test cycle has been redefined in such a way that EU Regulatory bodies view it as more representative of customer driving (ie higher speeds and loads, more dynamic accelerations, fewer and shorter stop phases).  The current NEDC test measures curb weight and rolling resistance. WLTP includes the effect of options on the vehicle’s aerodynamics, rolling resistance and mass when measuring its fuel consumption and emissions.

3. What will WLTP measure?

WLTP will measure a vehicle’s individual CO2 emissions, fuel consumption (MPG) and pollutant emissions (for example NOx). This is the case currently under NEDC, however WLTP will take into account vehicle mass (including optional equipment), tyre rolling resistance class and aerodynamics. The values obtained through WLTP will be comparable worldwide.

4. What does WLTP mean for me as a customer?

WLTP will provide customers with greater clarity in relation to the emissions and consumption values of their vehicle. It is important to note that due to the testing aligning closer to real world emissions, this could result in higher consumption and emissions values for vehicles with combustion engines and a shorter electric range for electric vehicles (including plug-in hybrids).

5. What is the benefit of lab testing for vehicle emissions?

Lab tests enable consumers to compare CO2 emissions and fuel consumption across different manufacturers and models in a controlled environment. As a standardised and repeatable procedure, it allows for comparison across brand and model in similar, standardised conditions.

6. How does the current NEDC testing programme operate?

The current lab test, known as the New European Driving Cycle (NEDC), measures fuel consumption (MPG), CO2 and pollutant emissions against EU regulations, in certain, standardised conditions. The standardised testing procedure allows the comparison of emissions between different vehicle models.

7. What are some of the limitations of the current NEDC test?

The NEDC test has been in place for a long time. Since it launched, the advancement of vehicle technology has progressed drastically. Vehicles today come equipped with an increasing amount of technologies, some of which that impact the fuel efficiency and emissions performance of the vehicle. These include heated seats, air conditioning, four wheel drive, rear window heaters to name a few.

8. When will SEAT begin to communicate WLTP values?

We are underway with testing vehicles under the WLTP testing procedure for new to market vehicles. Once a vehicle has been tested under WLTP and the type approval has been issued, customers will be informed of the WLTP values for that vehicle.

9. What is the impact of WLTP on vehicle tax?

NEDC CO2 values will be used for taxation purposes during the 2017/2018 tax-year, and will continue to be until further notice from the HMRC. We will update customers as further information is shared by HMRC.