Join Date: Dec 2012
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Tax is calculated on CO2 emissions. Even on the same car with the same engine, different levels of trim will affect the weight, and, yes, tyres can make a difference. The tax bands are quite narrow so it doesn't take much to tip it over the edge into the next band.
Currently in kernewek's garage:
2005 Clio dCi100, Land Rover S2A SWB