About 20 per cent of a car’s fuel consumption is caused by rolling resistance. The lower the resistance, the lower the consumption.
Since 2012, tyres have been marked with energy efficiency classes, from A (green) to G (red).
A car fitted with four A-rated tyres driving at 50mph – uses 7.5% less fuel than with G-rated tyres. That means a saving of up to £110 or 80 litres of fuel over the life of the tyres.
Results can vary with type of car or climatic conditions but the performance gaps are proven.