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post #3 of (permalink) Old 19th April 2006
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I'm not sure how the g/km scale is calculated,but I would think that fuel consumption and engine size must be taken into effect too.Any catalytic converter equipped car can achieve almost perfect emissions,but obviously not all have the same mpg.

Just to clarify;

CO is carbon monoxide(given as a percentage)
HC is HydroCarbons(unburnt fuels,given as PPM or Parts Per Million)
Lambda (often a symbol like a small L with a tail) is air to fuel ratio(Lambda 1 being a perfect ratio,below one being rich,above one being lean).

I'd rather push my Alfa than drive a BMW....
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