Originally Posted by ZAHANMA
I had a 2007 Base Coupe with the same problem. I actually had it replaced under warranty shortly after I purchased the vehicle new in April 2008 (it has since been replaced with a SRT6

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A good buddy of mine in Houston has a 2006 Base Coupe and it is also faded.
I do not believe it is limited to the year of the car...as it may be a post-2005 issue. Not sure though.
A lot of '06s were re-branded as '07s, however. Maybe those of us with this problem are part of that '06/'07 batch.
I also posted this question to the facebook fan page for the XF. Hopefully we get a handful of responses.