I can’t think of a location within the bodywork of a car that would provide accurate data considering wind-chill when it’s moving, excessive heat from either the engine, or stationary in the sun.
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Newer cars get the temp from the Air Mass Sensor. It’s part of your air intake system. It provides information about the air coming into the engine so that it can give the ideal amount of gas for combustion. Hot air is less dense, so less gas.
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