I do this all the time with various car rentals, although Ive not used avis too much. You have to wait for Avis / budget/ travelocity, etc. to post that you actually purchased (rather than made reservation and cancelled.). Since your purchase is typically done in advance and it takes time for avis to confirm you went through with the transaction, the bonus points dont post immediately upon your rental return. I don't monitor daily, just check over a month at a time. I have not had any issues in six months for car rentals. Only issue I've ever had was with Kohls and so I don't shop there.