[defrost]

4 million miles is proportionally less than the width of a gnat against the history of driver miles in the US across all cities, less than a rounding error.

More crucially, these are 4 million entry level service rollout miles .. a time when the company has highly paid engineers paying scrupulous detailed attention to the condition of the cars and the tuning of the automated responses, with jobs dedicated to the avoidance of PR incidents.

comte7092 has pointed out other factors - but these are not "typical miles" these are the miles before typical sets in - who can say if the stats will be maintained as sensors age and maintainence becomes an after tought in the manner typical of human driven cars.

I hope the figure holds up, I'm commenting here on the apples to oranges issues in the comparison at present.