Unless the prices have changed its $30 for 3 laps and a Winners Circle photo for $10 more. The pace car goes 70+ miles per hour. If you stay tight as a group and don't swerve and drive like idiots then they will go slightly faster. Some have lagged back a little to get a run in the corner or off the corner. Those with high horsepower have gone over 100.
It is single file and there is no passing. They have very powerful trucks that will come escort you off the track and out the door.
Yes that is a bit of a price to drive 70, but the key word is Charity. Its not about you, its about the kids they are trying to raise money for.
You getting to drive on one of the nations most popular tracks is a bonus.