Didn't realise you were running 255's on 9J wheels. I had that for a while and it destroys the shoulders (back on my 8.5J wheels now), that may also be a cause of your tyre wear as the tyres are wider at the wheel, flexing the main tread down a little resulting in heavier shoulder wear.
275/30/20 is the best option on 9J for tyre life.
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2010 Jag XF 3.0D Portfolio S
I know.. I know..
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