I think your math gives a pretty good estimate of what they might be looking at. I believe that in most, if not all of the previous years they listed "insufficient data" for the Boxsters. I still think that it gives a pretty good indication of the Boxsters reliability, putting it about equal to the M3 and much better than the Mercedes SLK or the Corvette.
I was actually relieved to see the "average" reliability rating because in nearly every other area it beat the competition.
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