mercedes c230 tire wear

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I've been using my car for like 10 years now..Within two years, I've experienced replacing my tires THREE TIMES already!!!! Usually, I would use the tires more than a year before eplacing them, but now,they seem to only last for just a few months. What seems to be the problem? My tires seem to rapidly wear out..Are tires produced nowadays give so much headache or is it my car that has the problem? Please help...