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wprater,
15 minutes of moderate driving is about what it takes mine to get the whole system, tank contents and all, up to temp so yours could still be running a bit cool and not up to steady state conditions at 15 minutes.
Your 30 minute readings appear to have the system warmed up. The temperature difference between the two lines to the front cooler confirm you're getting flow through it. It certainly appears your thermostat is opening around 165F. The gauge confirms that, right.
If you want to see the exact temp at which the thermostat opens, idle the car and record temps at intervals. It should be apparent when the thermostat opens and the lines to the cooler warm up.
Steve
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1978 SC - original owner
1983 SC - D stock "rescue" track car
DECEASED 2015 Cayenne Diesel (rear ended by distracted driver)
2017 Macan (happy wife...)
2016 Cayenne Turbo - tow vehicle and daily drive
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