Comfort and Convenience
Cabin temperature is the classic point of disagreement: build, clothing and where sunlight falls all change how warm a seat feels, so two people in the same car rarely want the same setting.
Safety and Driver Assistance
Before setting off with others aboard, it is worth locating the hazard lights, demister and mirror adjusters while stationary. Learning them in a quiet moment means not searching for them when the road already needs attention.
Multimedia and Connectivity
Long trips drain phone batteries, and whoever is handling navigation notices first. If a car provides a charging point, keeping a suitable cable aboard matters more than the call handling or audio features alongside it.