The Retail Prices Index published by the Office for National Statistics is used to measure changes in the costs of motoring.
The total cost of motoring fell by 4 per cent. from January 2005 to April 2008 in real terms. The total includes the cost of buying cars, fuel, maintenance and insurance. This overall fall was driven largely by the falling costs of car purchase—down by 20 per cent. over this period. The real terms cost of tax and insurance fell by 6 per cent., the cost of maintenance rose by 5 per cent., with the cost of petrol and oil rising by 21 per cent.