Water pump longevity ????

[kk2002s]

Before low temp thermo, hwy cruising was right around 194 degrees, summer time.
With low temp, my summer temps run around 176 degrees. In the winter it runs 172 degrees. This is using the Torque app for water temp.
Now in stop and go the temp will move up in the 212-215 and the fans come on same as reg thermo. But cruising 50+ mph the temp definitely runs cooler.
Cooler is better