Fuel efficiency is important to reduce both CO2 emissions and the cost of driving. The difference between a category C tyre and a B tyres means a reduction or increase in fuel consumption of between 2.5% - 4.5% for a car and 5%-8% for a truck.

 These results are dependant on correct tyre pressures, driving style and temperature.

The tyre external rolling noise level in decibels is shown along with one to three black sound waves, with one wave being the quietest tyre.

 Wet grip is a critical safety feature and relates to the tyres ability to stop a vehicle quickly on wet roads and can be expressed in tems of stopping distance. The difference in each category shown means a stopping distance of between one and two car lengths (between 3 and 6 metres) when braking from 50mph.

The difference between categories A and F is more than 18 metres stopping distance.

 Measured from the distance travelled by a car after braking at 50mph in the wet, according to regulation EC1222/2009