test, with the worst performers 26.4% down on their official numbers, but the best almost 19% up.
WLTP is, however, a lot more accurate than the old NEDC system, which it replaced in September 2018; a previous sample of 159 vehicles type approved to NEDC standards showed an average discrepancy of 20.2% between True MPG and the official results, with the worst performers as much as 40% thirstier than advertised.are conducted in strictly controlled laboratory conditions, but they are based on a real route that takes in town, rural and motorway driving.
As a result, they reflect what's achievable if you’re driving gently and sticking to speed limits but aren’t resorting to any unrealistically slow acceleration or special '
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