In the Peugeot I currently have, they last about a year (30000km, swapping fronts-rears at 15000km) but I'm convinced that it's because of the geometry of the front suspension. My brother owns a mk6 GTI and they wear evenly, plus theirs last circa 50000km (swapping them in between). We both never let them with less than 3mm in the tread. I often drive in twisties (motorways are something rare in here) and have fun at the same time. So, I believe in my new one with the proper diff they will last longer, because the fronts won't lose their thread spinning on corners, but just put the power down. Happy times coming!
P.S. I'm stuck with Michelins PS3 as they last longer and have better steering response than ContiSportContacts 3 I had twice. My brother tried them, loved them, now he's on Dunlops RT. We'll see...