I think the problem that you have is identifying exactly what "average" driving would be.

Nobody on the forum can really call themselves "average" because they have nothing for comparison.

PEH can get 100K out of a set of pads on the W126.........and he can be considered at the edge of the distribution.........but for everyone else............what's "average"???

You would need about 20-30 posts of folks who have that exact vehicle.........then you can determine an average.