Not to hijack this thread, but last week I stopped by Sebring and one of the Audi LMP cars were practicing. They had a compound setup like you wouldn't believe. There was a tent (more like a temporary building) about the size of my house, two Audi rigs, two Michelin rigs, several RV's, etc., etc., etc. all for one car that will never race at this track.
And it was fast, somewhere around seven seconds quicker than last years pole winner's speed in a Corvette DP. They brought in all nine drivers. Read about it here:
Audi encouraged by Sebring test | WEC news | Motorsport.com
The test sessions were closed to the public but I was able to shoot a couple of pics on the outside of the track before security ran me off. Here is the best...