There aren't any concrete answers to that but like I said, many F10 owners have experienced the same thing and I will not be surprised if I go check my i-drive now, it will show rear pads have worn out faster than my front...one common assumption is that it has to do with how the DSC and traction control works, using rear wheel braking for more than we think. The more powerful cars seem to show it up more
One fella in US asked BMW why and this was the answer:
1) If I do mainly city/local traffic driving, BMW has engineered the car to use the rear brakes more than the front (75% more use of the rear) to bring the car to a stop .... by using the rear brakes more, the car comes to a 'smoother' stop without the traditional 'front end diving'
2) In a high speed braking, like driving in the highway, BMW programmed the car to use more of the front brakes as they do have more braking power than the rear.
