* These figures have been calculated from actual use tests using sponge application on regular used tyres. Applying with a brush will waste product and therefore reduce economy. Old, cracked and porous tyres will require more product and therefore reduce economy. We have included the majority of tyre sizes and profiles. If yours is not shown, please contact us and we will add it into the calculator. The calculator is only configured for European standard vehicle tyre sizes in the format width / aspect ratio / rim size, eg 225/55/16.