you can experiment a bit with your tyre pressures. I would have thought you should have nearer 32 in the front and 34-35 in the back by the sound if it. but if you add 3-4psi, you will not be over inlfating the tyre, but you will stiffen the tyre wall a bit, this adds an element to your road holding and loses and element of comfort. best not to go below the tyre pressure recommended, and never exceed the maxmum tyre pressure stated on the tyre.
i tend to run mine 3psi above normal to increase the road holding.
your car will naturally increase its pressures by more than 3psi when driving on a motorway anyway so it wont make them wear out wrong. in theory it will reduce the rolling resistance a small amount so you benefit from better MPG. but its tiny. to see a difference you need to inflate them to almost the maximum, and then you would need to allow them chance to cool when on motorways at regular intervals, and you would be best to avoid any long high speed runs if you do that.
i tend to run mine 3psi above normal to increase the road holding.
your car will naturally increase its pressures by more than 3psi when driving on a motorway anyway so it wont make them wear out wrong. in theory it will reduce the rolling resistance a small amount so you benefit from better MPG. but its tiny. to see a difference you need to inflate them to almost the maximum, and then you would need to allow them chance to cool when on motorways at regular intervals, and you would be best to avoid any long high speed runs if you do that.