G/km (grams per kilometre) is a measure that tells us how many grams of carbon dioxide a car generates per kilometre driven. The average g/km rate is 138g/km.
Why does it matter?
Well, aside from the environmental benefits of having a car that generates less pollution, you’ll also save money as you’ll be taxed less!
For a full table for how this applies to the tax when you first register a vehicle, please see below (taken from the UK government website)
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