I just signed up for free Avis First Status and free National Car Emerald Status, which you can do as well with your MasterCard credit card. All you have to do is follow the link below and complete the steps to receive free status! Also, many readers  have received emails with a free weekend 2-day rental from Avis. So be on the lookout to receive one of those! I haven’t yet, but I’ll continue to monitor for it.
So, this is only supposed to work for those who have World Elite Mastercards (the premium ones) but it’s been confirmed to work with any MasterCard. 
Good luck and let us know if you received that free weekend 2 day rental!