Have a 2003 Corolla at 30k miles with original tires of Goodyear Integrity
P195/65R15 89s. The tires were rotated twice in the past at 10k and 20k.
Saw excessive tire wear, especially in the front, compared to other cars
at 30k. At 30k service, dealer suggested alignment after rotating the
tires for the 3rd time. After alignment was done, I can read from the
alignment report that everything except toes were in spec range and now
stay the same.

The front toes were +0.11 left and -0.11 right, compared to the spec range
of -/+0.10. The rear toes were 0.14 left and -0.11 right, compared to the
spec range of 0 to 0.27.

After the alignment, the front toes are now at -0.01 left and +0.01 right.
The rear toes are 0.13 left and -0.12 right. The right rear toe is still
out of spec range.

The dealer said the rear toes on 2003 Corollas are not adjustable, and it
would need a spacer to correct the out-of-range right toe. BUT there
should not be as much tire wear since the front toes were corrected.

My questions are these.

1) Since the front toes were so ever slightly out of spec range (+/-0.11
compared to spec of +/-0.10), how could the tires be worn out that much?
could it be the tires themselves that are of cheap types or quality?

2) With rear right toe still out of spec range, -0.12 compared to 0 to
0.27, is it worthwhile having a spacer put in to correct it?

3) The alignment report shows the thrust angle to be 0.12 before alignment
and 0.13 after alignment, while there is no spec range. I have the
impression that the thrust angle should be 0. Could the non-zero thrust
angle have caused the excessive tire wear?

I realize that this is a long post. Thank you for your patience and your
answer.