No real problems with the Avons, but wouldn't have chosen them myself! (I had Toyos before).
A year on both my front tyres have worn at the outside edges and need changing. Not sure if my tracking is out or if this is just a common failure mode with quattro. (Will get the alignment checked whatever I end up doing).
Don't really want to replace them with Avons, but not sure about mixing another brand with the Avons at the back.
Don't really want to replace all 4 tyres and chuck away the rears which have pleanty of tread. Conserving cash as waiting for the "final" bill for my recent house extension.
I know ideally you should replace all 4 tyres at once, but how important is this in practice. After all as it is my worn tyres at the front probably have quite a different characteristic to my rears.
Have had some mixed advice.
Local dealer said I should replace all 4 with Michelin PS2 for £139 each!
Elite Reading said OK to change just the fronts.
Toyos for £105.16 all in and PS2s for £120.44
Micheldelver said OK to change just the fronts, but that it was important that the rolling diameters as close as possible with similar amounts of tread front and rear.
Toyos £95.23 all in, PS2s £115.28 and the joker in the pack Goodyear F1s for £98.15. Quite fancy the F1s for that price and they're what the guy recommended.
Last year Elite beat Micheldever on price, so maybe they will match (plus I live in Reading and wouldn't have to sit in such a queue!).
My car has 75K miles, with cambelt change and 80K service approaching quickly, so I'm keen to save money if I can.
Don't want to break the car or dangerously affect the handling though either. I normally drive like your gran if that helps!

Any real world experience out there?
David