I know in australia it used to be parts per million, but now with the 'euro' titled regulations it is parts per km. But that's only for factory cars.
Anything that tests your personal car will only be able to check parts per million, so that's what they use. Testing overall fuel consumption and emissions in an annual check would be... Difficult
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Originally Posted by Crazyrabbit
In God we trust. All others: bring data
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