If you look at this forum you will see many, many instances with posters telling you what is required to use the Avis Employee code..including Avis identification and in some cases a letter from your supervisor AT AVIS.

by some of the posts it would appear that people believe that Avis Employees will not question you if you use the Avis Employee code.
It is a benefit to Avis employees so they probably do not take kindly to others using THEIR benefit.

As others on this forum have stated IF YOU ARE PLANING TO USE THIS CODE
BE SURE TO HAVE A BACK UP WITH ANOTHER COMPANY.

Should you want to believe some have used the code with no problem
that is your call. Any thing is possible depending on the individual person behind the counter renting you the car. BUT I would not want to be asked for AVIS ID and when I cant provide it have to rent that car WITH NO DISCOUNT.

Many companies with codes posted on this site do not have employee IDs
and many have rental cars booked by their corporate travel department
so it is better to use them rather than the code from the company you are renting the car from.