The energy lost when a tyre is moving is described as 'rolling resistance'.  This has a direct impact on fuel consumption of a vehicle as well as the environment.  The lower the rolling resistance, the tyre less energy is lost, reducing both fuel consumption and emissions.  To help you make an informed decision, PitstopArabia.com makes the rolling resistance of every tyre, where possible, available to you.  Rolling resistance is expressed in grades, ranging from A to G. A is the highest performing tyre in its category; G is least performing.   To put these scores in perspective:  fitting the worst scoring tyres in this category, you could end up using 6 litres more fuel for every 1,000 kms travelled, than if you fitted 'A' rated tyres.  There’s approximately at + 7.5% difference in rolling resistance between Grade A and G.'A' rated tyres could actually save you enough in petrol cost to buy a new set of tyres and more!These grades are neither applicable nor available for professional off-road tyres, temporary-use spare tyres, studded tyres, tyres used only for racing, tyres whose speed rating is less than 80 km/h and tyres whose nominal diameter is smaller than 254 mm or bigger than 635 mm.