 Do these drivers and teams have a pretty good feel for what they have now, or is there still a feeling out period as more rubber gets put down on the track and more sunshine beats down? I don't think the rubber and the sunshine is a big deal. Your track position is. So if you're in the back, as you move forward, the balance of your car is going to need to get a little bit tighter. You've got to be freer to run in the dirty air. As we talked about with Brad Keselowski, his car is turning really well right now because he's got clean air.