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From what I've read around various places, running a thermostat below 190 or especially below 180 is inefficient, and anything above 200 is risky unless you monitor coolant temps. As long as the thermostat has fully opened before the radiator fan comes on you should be good.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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