rear tires are nearly bald (center to outer edge) Is this normal???

Originally Posted by CoolZ

18500 miles, rear tires are nearly bald center to outer edge. Inquired at dealer and was scolded that I didn't read the owner's manual and get a 4 wheel alignment once a year.
Have owned several sports cars and never had the rear tires wear so poorly.
Recommendations on tires?

Originally Posted by CoolZ

Had the alignment today.
Left rear was -2.4 degrees camber aligned to -1.9 degrees
0.22 degrees toe aligned to 0.17 degrees

right rear was -2.1 degrees camber aligned to -1.8 degrees
0.05 degrees toe aligned to 0.12 degrees

Dealer was very pleasant, had one of their senior mechanics come out and talk to me about issue. He said this is common with this car, get alignment every 12K miles and definitely get harder tires if not going to the track

Ps...front barely needed adjustment
left toe 0.03 to 0.08 degrees