There was a thread called Hutch and FIP which talked about this earlier in August.
Basically Magits posted this, with a link to a good article:
There is an interesting article here (http://www.beyondtheboxscore.com/201...rperform-their) from 2012 about pitchers underperforming their FIP. It comes to a minor conclusion that perhaps pitchers do have SOME influence over their batted ball profiles, citing Johan Santana, who outperformed his FIP by 20 points over more than 2000 innings.
(because of his change up)
BTS, who loves his advanced stats, responded with this:
Obviously there are situations in which a pitcher's ERA doesn't match his DIPS and there’s something to it. Buehrle's ERA was lower than his FIP, people looked into it, and found that he's an absolute elite defender and that makes up most of the difference. Matt Cain had something going on. Knuckleballers and guys with elite changeups tend to give up fewer runs than DIPS suggests they should.