In stead of spending a million to get to Sebring or someplace like that, you could just get a bunch of friends together and go at it yourself for the next 24 hours. I'll bet you the police will think it looks odd, seeing the same dozen cars going by every 20 minutes, in the same direction. Here is the idea: You plan out a looping course in your area, using the local freeways and highways, from say, 5 to 12 miles (the Circuit de La Sarthe is about 8 miles) and you get some scorekeepers to keep count. Maybe you need scorekeepers in two places, so people can't cut the course. You could also setup basic rules, like you need 3 or 4 drivers on a team, and a driver can be in a car for up to 3 hours at a time. You could have different classes, like economy cars that only get say, 25 gallons for the whole 24 hours.