Your car guzzles much more fuel and money than you think.
Fuel consumption results obtained in the laboratory and on the road, in real-world driving conditions, were compared by the International Council on Clean Transportation (ICCT).
Here is what they found:
And this gap is growing bigger and bigger:
How is it possible?
Before the emission tests in the laboratory, carmakers optimise their cars in a way that is not representative of real-driving conditions. By doing so, they manage to reduce, on paper, fuel consumption and CO2 emissions.
For example, they:
- use so-called “fuel saving” technologies, like stop-start systems ⓘ, that makes cars more efficient during the test in the lab, but not on the road.
- make the most of test loopholes, including defeat devices ⓘ, to reduce emissions on paper.
- switch off part of the car equipment, such as air conditioning and lights, during the test.
Here is an overview of the ways the official data can be manipulated:
This picture shows how manufacturers have manipulated official fuel consumption data of passenger cars under the NEDC (New European Driving Cycle) certification procedure. As of September 1, 2017, new car models have to pass a newly developed lab test procedure, the WLTP (Worldwide Harmonized Light Vehicle Test Procedure), before they can be driven on EU roads. While the WLTP reduces some of the loopholes available in the NEDC, it has the potential for manipulation and exploitation of flexibilities, as does any lab test procedure. Unless effective surveillance mechanisms are introduced, carmakers will be able to exploit the loopholes in the WLTP and the discrepancy between official and real-world fuel consumption values will continue to increase.
What does it imply?
This fraud has huge consequences for the consumer, the economy and the environment.
We must close the gap
Consumers must be able to buy cleaner and cheaper vehicles, with fuel consumption figures they can trust.
Carmakers have been able to achieve, on paper, good fuel economy results. But this is only due to optimisations, flawed tests, the absence of spot checks on cars already sold, and the difficulties for consumers in taking action against unrealistic fuel consumption figures.
To tackle global warming, save consumers money, keep European carmakers competitive and reduce the EU's dependency on imported oil, we must close the gap between official and real fuel consumption figures.
The work is related to the emissions testing on three vehicles of different technology, all of which Euro6d-temp compliant, and under various driving conditions, both in laboratory and on-road.
Get Real testing campaign: why new laboratory tests will do little to improve real-world fuel economy
The report shows that the CO2 emissions gap between the independently performed WLTP and NEDC tests is small, and suggests the new WLTP test procedure is likely not sufficient to reduce or close the gap between official and real-world CO2 emissions. The report also stresses the lack of transparency about vehicle data, which complicates the analysis of independent tests and makes possible cheating harder to detect.
The new Worldwide Harmonised Light Vehicle Test Procedure (WLTP), designed to improve cars CO2 emissions testing in laboratory, will not stop carmaker manipulation of test results and will not close the gap between official and real world figures a new report by Transport & Environment shows.