Might be. Might not be. Its all according to the agreement between Avis and Costco. You'll need to read the terms of your rental very carefully. Costco should be able to answer this for you.
Enjoy the Avis Experience
One additional driver fee waived and GPS rental from $6.99 (plus tax) per day are offered to Costco members at participating U.S. locations.
We booked Avis using Costco for our December 2015 trip and it was second driver free (not sure if it has changed since then).
Be sure to keep checking back for discounts. I rebooked (same dates/times) when I saw they had a $20 Costco cash card. The cash card arrived in the mail about a month after the trip.
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