Hi -My own personal experience is that I have a 2010Mk2 1.6TDCi manual with16" Michelin Primacy HP. At the 12,500 service recently the fronts were measured at 6mm of tread remaining, so potentially I could achieve 37,500 miles of use(with 2mm remaining). I have to assume that type & style of driving will have an impact. I personally do about 80-90% of my driving on dual carriageways and motorways, so little braking or corners.
2010 1.6TDCi Titanium, Panther Black, Sony 6CD DAB, USB/BT, Privacy Glass, F&R Parking Sensors