According to the truck tire dealer I dealt with, Michelin actually has numerous fleet programs, all with different criteria, but I don't recall which or how many were called "Advantage". I do recall that payment was made (or supposed to be made) via FMCA. The gal in the office was confused by the different programs, and erroneously ran my credit card before the manager could correct/stop her.
Edit: Hoping to save some driving time, I stopped at one Less Schwab tire dealership and asked if participated in the program. The guy made a phone call and was told that they're not allowed to participate in the program. I don't know if this was Schwab corporate ruling or a Michelin one.