I recently rented a car from AVIS at Frankfurt for travel to Dagstuhl. We drove to Dagstuhl, left it parked for 5 days, and returned without incident. On return, the attendant -- very pleasant, btw -- found 'damage' to the front driver's side rim and wanted to know details about the 'accident' . There was no accident while the car was in my hands. I related such to the attendant, but didn't make any progress. AVIS tacked an additional 147€ change on my corporate credit card. This was immediately after the Paris Hebdo incident, so we knew security lines would be long and slow, so even though we arrived 3 hours before the flight, we didn't have any spare time to argue the point.
Interestingly, there was no outbound inspection by AVIS when I rented the car. Below is a picture of the rim after the attendant pointed out the issue. There's certainly something on the rim at about the 6:00 and 3:30 positions, but it didn't happen while I had the car. The photographic quality is bad, as the return area was very poorly lit. I took a quick look around the car when I rented it, but didn't spot the supposedly damaged area.
Hopefully this isn't systemic behavior or practice
on the part of AVIS.
I suppose the lesson is (a) take a walk-around video when your rent the car -- hopefully there's enough light -- or (b) perhaps use a different vendor.
A subsequent letter from AVIS detailing the damage charge ended as follows :
If you would like to exclude this risk in your next rental, you can purchase an excess-waiver for a small additional charge.