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I don't know the answer to your question or have experience claiming a treadwear warranty, but I also don't want to be the bad guy here but it needs to be asked:
1. What car is this? (Make/model)
2. How is the car used? (i.e. daily driver / track car / commercial use with heavy loads etc.)
3. Was the vehicle ever in any accidents?
4. Is your alignment up to date or has it been checked regularly?
5. Do you rotate your tires/wheels regularly?
Answering these questions might help us and help you understand what's up with your tires. That's a bit abnormal in my experience with those tires. We have them on my parents' Toyota Sienna (or was it Lexus RX300 - doesn't matter I guess) with over 100,000km and there's plenty of tread left, likely enough to last another 3 or 4 years.
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