Mitsubishi Lancer 2009: Ralliart wearing tyres quickly

My 2009 Mitsubishi Lancer Ralliart wear tyres very quickly on the front. I have had them balanced aligned and rotated etc., and I?ve been told that because the car is heavy it will go through tyres. It has just ticked over 13,000 km; I?ve never had to replace tyres within such a short space of time. The dealer referred me back to Mitsubishi, but they told me that it was not a manufacturer?s issue, but was an owner responsibility. What can I do to rectify the situation?