I have looked at the health report from todays bargain service at Audi, it states the following tread depth etc. Front Left 5 Front right 5 Rear Left 5 Rear right 2 They were all replaced at the same time about 16 months and 13,000 miles ago with Goodyear Eagle F1 Aysm. I also had the fronts and rears swapped about 7,000 miles ago. Dont understand why these reading would occur. I did question it and they said they could check the drive train, I was on a while you wait service and due in a meeting so couldnt wait at the time, thought the technician might of thought this was off and looked further. I will check with my guage to ensure it was not a sausage finger mistake but a little worrying.