Some summer tires around 300 treadwear only last about 15000 miles, and if a tire cannot be rotated they say to expect about half the rating for rear tires.
There are no mileage guarantees on the Bridgestones, so I doubt contacting them will do much. I can check mine tomorrow and see how much tread is left. I am around 5500 miles (IIRC, haven't driven much since March)
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