Here's a couple of laps at a recently opened track in Hitchcock, Texas. It's only 1.3 miles with a planned expansion to 2.4 miles. This is the best surface I've ever run on. Very smooth but decent grip. One of the local BMW dealers set up this track day.
http://videos.streetfire.net/video/63e6ec1d-587c-4f11-bcf2-9a7f000971d2.htm