I have just purchased an Audi A3 8V 2.0 ltr Turbo S Line 2015. The tyres on it are 225/40 R 18 92Y. The recomended tyre pressures on the vehicle label state: 2.9 bar/42 psi front and 2.7 bar/39 psi rear, these pressures seem a little high, can anyone help?