I replaced my Jaguar XF 3.0 D with a Jaguar XF 2.2 D in January this year and originally thought that the much 'harsher' ride was due to the 'newness'. 5000 miles later I don't think it is. I can see that the lighter, smaller engine may play a part, but from reading your advice column it is clear that the wheel and tyre size may be the main culprit. The current tyres are Pirelli 245/45 ZR18 DOT XT 4J J759 1212. Can I get back to the degree of comfort I had before just by changing tyres, and if so, to what? Or will it have to be the wheels as well, and is there anything else that the dealers could do by 'tweaking' the suspension?