Car Manufacturers have been accused of manipulating the official emissions testing methods to acquire lower figures than they actually do by the European Commission. The recent published report by the European Commissions claimed that the emissions tests could have been doctored, which would result in CO2 figures appearing to be as much as 11% lower than they would be when it came to driving conditions of the real world.
Tweaks with emissions testing?
Some of the tweaks that could be used when it came to the emissions testing methods to portray lower emission figures could be, using smaller wheels which would optimise the rolling resistance of a vehicle and fuel economy. Also, emissions testing a car with a battery that is fully charged would also lead to a lower emissions reading. The report has also stated that some manufacturers use the same track in Spain to test vehicles on a regular basis, rather than their own test track, as it had optimum conditions with regards to testing coasting data, like downward slope, minimal aerodynamic drag and ambient conditions.
The report could also have some implications on the car industry due to the fact it points out where some regulations allow discrepancies. It mentions that tests have to be carried out in two opposite directions, though it does not say they have to be carried out on the same road, therefore both directions could easily be downhill. It was also said that some manufacturers would allow their cars to precondition before testing was carried out, which would ensure that certain parts were completely warmed up and also sealing gaps in between body parts by taping them, which would help to lower the resistance of the vehicle.
No manufacturers in particular were highlighted with regards to the emissions testing
The report does not single out a car manufacturer in particular, though it is hinted that these sort of tactics are being carried out throughout the whole car industry.