Hi everyone. I'm new here and could do with some advice. First off I have 306 hdi lx with 195/55/15 tyres what's best pressure to put in for a smooth ride. Also I have noticed are these cars known for loud road noise. I have dunlop sport bluresponse tyres on. One other thing too. When the car is idle it's rpm is around 800 to 850 rpm but the steering wheel vibrates and buzzes with the engine. Is this common or could there be a problem. Thanks all. Any advice is appreciated.