Is 2cc of fat transfer to cheek bilaterally average?

There is no permanent reversal to fat grafting unless its surgically or liposuction removal.  You can try steroids + 5FU + hyaliuronidase with or without RF treatments like venus legacy and exilis ultra to get improvement. I suggest you see an expert for an evaluation.  if you are getting fat grafting, 2 cc is minimal amount and likely you will need more significant filling with fillers, Sculptra or Bellafill long term.Best, Dr. Emer.

Hello and thank you for your questions.
Every patient is different and requires a personalized treatment plan. It may be that 2 cc of fat will correct your volume loss. In general about 70% of transferred fat survives and it may be even higher in the face. 
I recommend that you seek consultation with a board-eligible or board-certified plastic surgeon who specializes in aesthetic plastic surgery and be sure they address all your concerns including the risks and benefits of the procedures, recovery time and postoperative course. Above all you should clearly express your desired aesthetic goals so that the plastic surgeon can develop a personalized treatment plan for you. 
I believe a key component of the consultation is to establish a good connection with your plastic surgeon. If you don’t feel you have a good connection after your consultation then they may not be the best surgeon for you. 
Best wishes!
Olivier A. Deigni, MD, MPH
Houston Plastic Surgeon