What is the link between the CO2 emissions and fuel consumption of my car?

The amount of CO2 a car emits is directly related to the amount of fuel it consumes. For instance, a diesel car emitting 95g CO2 per kilometre consumes around 3.7 litres of fuel per 100km, while a petrol car consumes around 4 litres/100km for the same CO2 emissions.

Fuel efficiency, sometimes referred to as fuel economy, is the relationship between the distance travelled and the fuel consumed.

Consumer information – Policy recommendations

What is WLTP and how does it work?

What is the purpose of the WLTP lab test?

What are the benefits of WLTP?

From NEDC to WLTP: What will change?

When will the WLTP changes take place?

How to ensure a smooth transition to WLTP?

FAQ

The NEDC value of a car suddenly increased, what happened?
The same car suddenly has two different CO2 values, why is this?
Will my fuel consumption increase under WLTP?
Will the WLTP test affect CO2 targets?
Will WLTP affect how much car tax I pay?
Will WLTP end the discrepancy between the laboratory and on-road performance of cars?

Policy Recommendations

Consumer information
Revision of the Car Labelling Directive
Taxation

Transition Timeline: From NEDC to WLTP

  • Cars type approved using NEDC before September 2017 can still be sold.
  • WLTP type approval testing will be introduced for new car types.
  • Some cars will have ‘old’ NEDC values, while others will already be certified under the new WLTP conditions.
  • The industry would like to start using WLTP-based results for general consumer information (eg sales brochures and websites).
  • During the period of transition (up until the end of 2018), only NEDC values should be used on labels and information in dealerships to enable consumers to compare different cars.
  • It is expected that national tax regulations will continue to be based on NEDC values.

The same car suddenly has two different CO2 values, why is this?

The NEDC value of a car suddenly increased, what happened?

  • All new cars must be certified according to the WLTP test procedure, and no longer on NEDC.
  • An exception should be made for end-of-series vehicles to allow for a limited number of unsold vehicles in stock that were approved under the old NEDC test to be sold for one more year.

Will my fuel consumption increase under WLTP?

  • All cars in dealerships should have WLTP-CO2 values only to avoid any confusion among consumers, in the view of the automobile industry.
  • National governments should adjust vehicle taxation and fiscal incentives to WLTP values, respecting the principle that WLTP should not have a negative impact on consumers.

Will WLTP affect how much car tax I pay?

The same car suddenly has two different CO2 values, why is this?

  • The European Commission will convert today’s (NEDC-based) CO2 targets to specific WLTP-CO2 targets of comparable stringency. These new WLTP targets will apply for monitoring car fleet compliance.

Will the new WLTP test affect CO2 targets?

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