There was a big sales promo @ Ford a while back (late '06, I think) wherein they extended the warranty of Ford cars sold during that promo to 50K miles if I remember right. Expressly EXEMPTED from that extension was the Ford GT. So, I just don't understand how this particular GT was somehow granted 50K 'extension' by Ford.
I'm not saying it WASN'T. I just don't see HOW. ('Dealer screw up, maybe?)
You might want to read the terms of that warranty yourself. If you don't have access to the 'agreement, you might be wise to try to get it and read it for yourself to be sure. (To cover your own butt as it were.)