 Doug, with these high temperatures and the fact that the track is taking on rubber, it's going to change all day. You're going to have to keep up with the racetrack, and that's something we talk about a lot, but it's on steroids today. On a concrete track, taking rubber every single lap from these race cars, not only for the teams to keep up with the racetrack, but the drivers up front to keep the winning speed. They've got to kind of hunt and peck for the best grooves all day long as well.