Had 4 Michelin PS4 225/40/18 tyres fitted to my 245 yesterday with the pressure set at 35 psi.  What a difference it's made to the car, less road noise, better turn in, super super grip, improved braking and generally improved the ride. These replaced the OE Bridgestone tyres fitted from the factory.  I'm actually surprised how big the improvement is.   That is all.    AG