Since we have undersized radiators, I like to have mine @ 100% before 180 during the summer. It gets around 105-110f here during the summer.
In the winter, you can run stock settings (what's pictured there) or bump it up to 100% @ 190-200. If the fans come on too soon in the winter, the car might take longer than optimal to come up to temp. That can cause poor gas mileage and over a long time, even cause uneven wear or damage to the engine.
I would just run one setting in summer and another in winter. Not hard to change and flash.
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