None of that really matters. The tstat rating is the set-point or regulation point. It is the system operating design point. It is the temperature at which the cooling system water is designed to operate at, given adequate cooling system capacity. Running above that temp is an indication of inadequate cooling capacity.
To prove it, take the car out on a freezing azz winter day, like -10 deg F. Observe what the temp gauge reads. It will be no more than the t-stat rating, within measurement accuracy. And why is that? On such a cold day, there is excess cooling capacity and the system will run as designed. It should NOT be any different on a boiling hot day, as long as the cooling system is up to the task.
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