I have asked this before - as I understand it "When an XL tyre is run at the pressure recommended by the vehicle manufacturer, it will last longer. These tyres are considered to have greater grip and better traction. Because they are more rigid, they will corner better and maintain stability. They also transmit power from the engine to the road more quickly, which may be an important feature in performance cars. In addition, XL tyres can provide better resistance to the extra load from acceleration and braking, and the centrifugal force from cornering. On the other hand, these tyres are usually slightly noisier than standard load tyres." They do tend to be used on SUV's and performance cars - cars that are heavier and/or put significant loads on the tyre when driven hard. Judging by the mainly positive comments on here they seem ok on a 7