Can someone tell me why the emissions for the automatic versions are so much higher than on the manual versions.
As the only difference is the auto box the raising of the VED catorgory by 2 levels in most cases seems a large increase.
I guess the same thing applies to petrol as well but what causes the emissions to be so much higher, particularly as we now have tiptronic boxes which are surely similar to manual boxes.
please enlighten me.
Keith
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I would guess at inefficiencies in the engine due to transmission losses.
An auto-box takes a large amount of power from the engine to run, even today, and this is bound to increase engine loading.
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