With all of the current debate about road tax - I think I have a better solution.
Basically, it doesn't matter how much your car pollutes per mile what is important is how much CO2 you create in total.
If you have a 300g CO2/mile car and do 5000 miles per year, you produce the same CO2 as a 100g CO2/mile car that does 15000 miles per year (1500 kgs of CO2 in total). The amount of CO2 you produce is linked directly to the amount of petrol/diesel that you use.
If we abolish road tax (which in 2006/7 brought in £5.1 billion) we could increase the price of petrol and diesel (which brought in £23.6 billion and at least another £4 billion in VAT) to make up the short fall - about 10p per litre.
Now, whilst that may sound terrible, it does mean that we could also abolish the part of the DVLA that runs the whole road-tax system. The disc would be replaced by an insurance disc that your insurer issues with your policy. It also means that foreign drivers are being charged...
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