...then I guess I better not mention hitting 173 in the Vette on a nice early Sunday morning a few years back, since the saftey police seem to be out in force...
If asphalt, a divider, and empty lanes qualifies as a track, then yes, I was on one.

I wouldn't do it again, as at that speed the front-end starts lifting just a touch, especially over slight rises. It's never a good thing when you can crank the steering wheel left and right and still have no problems going straight...