thats really a long life for the tyres!
i've been terribly unfortunate - had to get all the 4 tyres replaced by 24k kms. It was largely due to overspeeding with a full load, I guess. Moreover, I ended up driving close to 5-6k without proper alignment. the alignment was lost after a minor accident and i missed the point about the alignment not being correct which my service fellow told me about
. only when i saw the tires getting worn-out from the insides, it struck me that i had forgotten to get the alignment done!