I had a customer spend £1800 changing from a 24,000 mile Fabia to a Citroen C1 or Peugeot 107 I forget which it was now, just so that he could pay £30 a year road tax as his Fabia was £130 a year. As he's only done 1,000 miles in the last 3 years the saving on fuel is negligible, but in about 16 years time he should start saving money on his road tax!!