Might not necessarily be pertinent to your situation but is it a turbo engine?
Also, this mileage thing about coils dying around 100k I'd have to disagree with. My Tundra has 230k, factory coils. My wife's Forester, 128k. In all the vehicles I've owned that were well over 100k, I've replaced a total of 5 coils........4 of them were replaced because, as I mentioned, I bought non factory coils and two died within a year.
Also, in my opinion, your vehicle is new enough that if there were a misfire related to a coil your ECU would almost certainly have seen a constant CEL or perhaps a flashing CEL during the misfires.
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