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post #7 of (permalink) Old 3rd January 2010
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Re: Co2 per kilometre

Intriguing question!

I googled "how is co2 output measured car"

and found the following:

The amount of carbon dioxide (CO2) emitted from a cars exhaust pipe is calculated in grams per kilometre (g/km). Tests on the new cars are conducted in a laboratory on a “rolling road” and the output is based on a “combined cycle” in which a variety of driving conditions are replicated. The CO2 output is then printed on the V5 registration document of all cars registered after February 2001.

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