Just catching up to this thread. It should be noted that the DMV report only covers disengagements on public CA roads. Tesla tests in other places, including non-public tracks where such reporting is not required. For example, substantial testing is done by them and others at Moffett Field in Mountain View on the runway and taxiways. (I've shared the runway with them during testing, so can state this with certainty.) To use that report as a measure of Tesla's (or any other manufacturer's) testing program would be highly misleading.