The tests simply don't match modern real-world driving patterns. For example, apparently real-world drivers tend to accelerate much more rapidly than in the tes

The tests simply don't match modern real-world driving patterns. For example, apparently real-world drivers tend to accelerate much more rapidly than in the test sequence. It doesn't just affect diesel cars either; they tend to over-estimate the fuel efficiency of all cars and presumably under-estimate their pollution levels too.