It's dependant on what you want. If you live in a hotter climate, select a lower temperature thermostat; that causes the thermostat to open sooner, keeping the engine a little cooler... hopefully. If you live in a climate that is either normally cooler or seasonably cooler, a hotter thermostat can help the heater work better. A hotter thermostat has been demonstrated to be SLIGHTLY (almost insignificantly) at helping the engine run more efficietly.
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