Bridgestone Turanzas - had 9/32" at 62,300, now at 4/32" at 95,400. Don't know how many more miles these tires are good for. Does it make sense to rotate tires at 4/32", or just wait until new ones put on. Don't have the mileage when last rotation was done, but definitely not done in the last 10K of '09 Jetta. Thank you in advance.