You were also asking about tyre wear with positive camber e.g. top of the tyre further out than bottom. I have the standard grove gear and wheels with 8" Air Trac tyres on my S5 Outback. After a little more than 400 landings, almost all of those on tarmac, there is very little tread on the outside of the tyres and plenty remaining on the inside. This weekend I will swap the tyres around and start wearing the other side.

Does my experience match others with this set-up?