I believe these published averages are arithmetic mean and may be skewed by long-distance drivers and multi-car households. As reported, it seems to be just total fleet mileage divided by number of drivers.
For this kind of question about maintenance, I wish I could find a histogram or at least quartile summaries of per-vehicle distances per year.
For this kind of question about maintenance, I wish I could find a histogram or at least quartile summaries of per-vehicle distances per year.