Could be that your struts and springs are starting to sag. Honestly though, 22,000 miles out of a 180 AA A tire is about normal and maybe even a little better. There's guys on this forum that have worn out KDW's in that amount of mileage and they're 300 AA A.
I think you must drive fairly gently and the way the camber sits on Tours the insides will wear faster. I like to corner and usually wear out the outsides first.
How much tread was left on the outsides?
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96LX/ATX/A4 repeaters/SVT exhaust/KKM/E1 suspension/SE rockers/BAT swaybar/urethane bushings/Kenwood 7 speaker syst./
Soon: SVT brakes/E0 rims/225 50 16 XGTV4's........
96LX/24V/ATX/Midnight Red/A4 repeaters/SVT exhaust/KKM/65mm throttlebody/SVTsprings and ST200 struts/SE rockers and BAT spoiler/BAT 19mm swaybar/urethane bushings/Kenwood 7 speaker syst./E1 SVT brakes w Powerslot rotors/9005 lowbeams/885 fogs/50% tint/Michelin XM+S 130's for winter/E1's with gForces for summer...and now "New Paint!!"
87 Renault GTA convertible/2.0l/mtx/Sony sound/otherwise stock
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