endurance -
It's normal for me. On my car, if the ECU/PCM sees that I am traveling at highway speeds, it increases the idle RPM using the Idle-Air-Control (IAC) Valve. It also increases the idle RPM when the engine is cold :
How Does an Idle Air Control Valve Work? IAC
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An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The cars computer or ECM (electronic control module) receives information from various sensors and will output signals to adjust the IAC motor in or out to adjust engine idle speed by controlling engine idle air.
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CarloSW2