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> Unless I've really messed up my math,

You have.

The chart is in (g per 100 kcal)

>"magic math" and change them from 42 g/km to 229g/km.

42 is for production of the car 229 is for ‘well to wheel' emissions (i.e. exhaust-pipe plus those emitted to produce the petrol).

No "magic" required.



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