A tyre is constantly deformed by the loads it is exposed to during driving. Depending on the bearing surface and the tyre air pressure, this deformation has a cost in terms of energy and therefore of fuel. Through the use of special heat-resistant and deformation-resistant materials in the tread and sidewall, deformation of the tyre is reduced and energy losses are minimized. Reduced rolling resistance tyres also possess special rubber blends, thus increasing ride comfort and helping to reduce the fuel consumption and emissions of the car.