CO2 Emissions and Efficiency

Efficiency whilst driving is essential, not only to prevent pollution to the environment, but also to save you money.

Recent legislation now requires all cars to follow an extensive test procedure for efficiency and CO2 emissions. The new test is called The Worldwide Harmonised Light Vehicle Test Procedure (WLTP).

What is WLTP?

The Worldwide Harmonised Light Vehicle Test Procedure (WLTP) test is used to measure fuel consumption, CO2 emissions and pollutant emissions from passenger cars.


This test replaces the previous New European Driving Cycle test which was created in the 1980s and has become outdated. The new emissions test is based on real driving data and gives a much more accurate reflection of real driving profiles and emissions.

The WLTP comprises of 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 powertrain 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 world regions, so pollutant and CO2 emissions as well as fuel consumption values would be comparable worldwide.

Benefits of WLTP

WLTP will introduce much more realistic testing conditions which will provide a more accurate basis for calculating a car’s fuel consumption and emissions. These include:

  • More realistic driving behaviour
  • A greater range of driving situations (urban, suburban, main road, motorway)
  • Longer test distances
  • Higher average and maximum speeds
  • More accurate accelerations and decelerations
  • Shorter stops
  • Stricter car set-up and measurement conditions

What happens next?

From September 2018

All new cars must be certified according to the WLTP test procedure.

From January 2019

All cars being sold should have WLTP-CO2 values only to avoid any confusion.

National governments should adjust vehicle taxation to WLTP values.

From 2020 onwards

The European Commission will convert today’s (NEDC-based) CO2 targets to comparable WLTP-CO2 targets.

How to keep your car running efficiently

There are several ways in which you can ensure that your vehicle is efficient, from checking that your tyres are correctly inflated, to managing the oil levels in your engine. Every Lookers Service department will gladly check your brakes, exhaust, oil levels, wheels and tyres, as part of a complimentary Vehicle Health Check when your vehicle is serviced. To book your Vehicle Health Check, select your brand below and book online. Alternatively, you can call your nearest Lookers Service department here.



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