Comfort and Convenience
Cabin temperature divides people more than almost anything else. One passenger wants a steady flow of cool air, another finds the same setting draughty, which is why longer trips usually involve some negotiation over the vents.
Safety and Driver Assistance
Preparation includes the small habits: adjusting mirrors, checking that you can read the instruments at a glance, and learning which switch does what. Doing this while parked means less fumbling later, when your attention belongs elsewhere.
Multimedia and Connectivity
Calls are the awkward part of a long drive. Where a hands-free arrangement is available, it removes the need to hold anything; otherwise the sensible plan is to return calls at a stop, separately from music or charging.