Do you rotate your tires??
I'm not going to do the conversion from Km's to miles, but generally every 3000-4000 miles you want to consider rotating your tires front to back.
The manufacturer doesn't warranty tires at all, at least for tread wear. Tires wear at very different rates depending on how you drive, what you drive on (gravel, asphalt, etc.), air pressure, and alignment. A good performance tire, when properly rotated, and on normal (not gravel) roads with correct air pressure should go about 10,000-15,000 miles or so. You can do the km conversion, of course.
About alignments:
It isn't hard to change an alignment on a vehicle, the hard part is the setup. Typically, a shop will charge for an alignment even if nothing is done. I've found this to be slightly unfair, but also in fairness those machines cost big-time, and the time on them is about the same whether you are within spec, or if you are in need of adjustment. You can determine for yourself if you need an alignment if your steering wheel is slightly crooked from center while driving on a straight flat road, or if your tires are cupping or feathering, or if they are wearing unevenly. Some of these signs will also be because of lack of rotation, too.
