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I too would be more worried about why 1 tire wore faster than it's mate on the same axle. Unless your daily commute is in circles that would indicate a problem with alignment and/or tire pressure.
If I ever have to replace a tire that is more the 1/2 way worn out I replace the other on the same axle too. This hasn't been a problem for me much since my tires generally only last 10-18k.
If you elect to only replace one, do this test after: Get up to 60 on a straight flat road and do a full ABS panic stop with your hands off the wheel (brace using your left leg on the dead pedal). If the car doesn't track perfectly straight you have problem (tires/alignment/brake/suspension).
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