The rear armrest in the center of the rear seatback can be used (no occupant in the center seat) or placed upright.

WARNING
Never put your hands and fingers around the moving parts of the seat and armrest:
Putting your hands and fingers around the moving parts of the seat and armrest is dangerous as they could get injured.
Split Folding
Head RestraintsMazda 6 Owners Manual: Cruise actuator removal/installation
1. Disconnect the negative battery cable.
2. Remove in the order indicated in the table.
3. Install in the reverse order of removal.
Cover Removal Note
Unclamp the clips of the heater hoses at the front of the cover.
...
Mazda 6 Owners Manual: Mounting the Spare Tire
1. Remove dirt and grime from the mounting surfaces of the wheel and hub, including
the hub bolts, with a cloth.
WARNING
Make sure the mounting surfaces of the wheel, hub and lug nuts are clean
before changing or replacing tires: When changing or replacing a tire, not
removing dirt and gri ...