European Union green tranpsort policies NGO, Transport and Environment, published a report that they claim provides new evidence and understanding on why there is a growing gap between the official fuel consumption and CO2 emissions of new passenger cars and vans and that which is achieved by the same vehicles on the road. They claim that the report demonstrates that the current (NEDC) test is outdated and unrepresentative of real-world driving and current vehicles, and that lax testing procedures are allowing car-makers to manipulate the official tests to produce unrealistically low results.
The report also claims that the current supervision of testing and checks on production vehicles (to ensure these are equivalent to tested vehicles) are inconsistent and inadequate, with manufacturers paying the organisations undertaking and certifying the tests. They conclude that the current system for measuring car and van fuel economy and CO2 emissions is not fit for purpose and is in need to urgent updating.
http://www.transportenvironment.org/publications/mind-gap-why-official-car-fuel-economy-figures-don%E2%80%99t-match-reality
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