As they say in dealers across the globe.
"They all do that sir"
"Nothing to worry about"
Except this time, they aren't talking rubbish. Which is a change.
FWIW, the idle speed is generally based on fuel temp, air temp, fuel quality, coolant temp. And a few other parameters, depending on the car.
You'll probably find the idle speed can vary by 6 or 700 rpm. Just try doing a cold start (-30) at 3000m, it'll idle like a bag of spanners but try to hit around 16-1700 rpm. Just to stop it stalling.
