CAP hpi has found that CO2 rises by 10% under NEDC correlated values – but PHEVs by almost three times this amount.
This follows a study of emissions data between September 2017 and 25 May 2018 covering more than 600 models across the range of vehicle sectors.
The data revealed that:
- diesel vehicles increased by 12.6%,
- petrol by 7.3%,
- petrol/plug-in hybrid by 27.3%
- and petrol hybrid 7.8%
NEDC correlated values are derived from WLTP testing but converted back to an NEDC figure. The figures do not include optional equipment.
WLTP in its true form will come into circulation from September 2018, but there will be no fiscal impact to tax until April 2020.
Andrew Mee, senior forecasting editor at cap hpi said:
“The industry is already seeing the impact of WLTP as some models are removed from the market and options are rationalised.
“While we expect to see the fleet mix change over the coming months with drivers shifting away from models with large CO2 and BIK increases, we don’t expect to see a significant spike in overall sales ahead of WLTP changes in September.”
The WLTP legislation is designed to provide consumers with a more realistic view of how a vehicle performs concerning mpg and CO2. The previous NEDC test cycle does not take optional equipment into account and doesn’t offer an accurate representation of driving styles which affect the emissions produced by a vehicle.
cap hpi said it is integrating the additional data needed to handle the expected changes arriving from the new WLTP and RDE emissions tests. The additional information will be added to the company’s New Vehicle Dataset (NVD) over the next few months.