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All those miles are recorded, fuzzed and replayed in simulation, where they've driven over 5 billion miles. I assume they retest all the miles + fuzzed versions on every version release.

It’s past 10 million miles and it’s driving more than 500k mi per month. If the last version of the software was in August that it’s more than 2 million miles by now. The miles per month figure will only increase.

And how many of those miles are up and down 101 after midnight on weekdays?