2009 Cadillac CTS-V - Track test (http://www.dpccars.com/car-videos-08/12-10-08page-2009-Cadillac-CTS-V-Track-test.htm) I though it would have a better mph at the end of the quarter mile.

I am guessing that the location of this testing had high elevation or horrible driver in a 6-speed car. If you noticed it also only got a 4.3 0-60:( .I am guessing high elevation if you notice the mountains in the background.