I know nothing about a PCU computer, but I've been doing this since June and so far have noticed no ill affects.
I think that it seems to shift a little harder or at least some different for the initial warmup..... but it seems just like a warmup period for a mike or two.
and my guess, if you are correct, is that the worst that would happen would be less than optimal efficiency for a few miles...
and likely no different than you would see if the next start up was in different weather conditions.... like say if it was last run in the winter, then stored through most of the spring to more summer like conditions..... seems to me that any such computer would have to "learn" the new conditions....
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