The move will also see the publication of pollutant levels including nitrogen oxides (NOx) with Euro 6 passenger vehicles by spring 2017. 

The procedure will measure real-world fuel economy for each of PSA’s main passenger vehicle models with tests on open public roads near Paris in real driving conditions, with segments to include urban, extra-urban and highway driving.

The procedure will be included in PSA’s quality processes. The process, its correct execution and the tests results' measurement will be audited and validated by an internationally recognised independent third party. Discussions are underway with Bureau Veritas concerning the execution of this programme. 

Carlos Tavares, chairman of PSA’s managing board, said: "This innovative initiative is a clear demonstration that a carmaker and independent NGOs can reach agreement for the benefit of customer information. This will also highlight the advanced technologies that PSA Peugeot Citroën is developing to contribute to fuel efficiency.”

Jos Dings, director at T&E, added: “Real-world measurements of CO2 emissions and fuel economy will help drivers choose the most efficient models benefiting consumers, public health and the environment. We are confident that the work we plan to undertake with PSA can generate transparent robust results that everyone can rely on.”