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I dunno, I get the theory of thermostat keeping it that way..But my rig did the same with an old and a new thermostat. Going on a long downhill run it'd cool down a bit. My old Hilux did the same. They'd do the same if I just left them idling for ages, they'd just keep cooling down slowly. I don't know if once open, they don't close fully until a certain point or what, but it hasn't worried me.
What I have noticed now is that the auto choke (which I've had issues with previously, but thought i'd adjusted it enough to sort it) I believe is coming back on after a drive in cold weather, as it idles high for a bit when I come back to a standstill until the carby seemingly warms up a bit again and the idle lowers. Might wind the auto choke off a bit further.