It's probably down to perception, when the car is hot I put it on 16 to cool down and then 19.5-20.5 when it has cooled down, if it's cold and I put it on 20.5 then it feels effing freezing!!
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Current: G20 320d xDrive F22 M240i
Previous: Many, many boring BMWs, 116d (F20), 220d, M240i (F22), 318d (F30), 320d (F30 and G20), 330e (G20), 420i (F32), 420d (F32), 435d GC (F36)
