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: Outside Mirrors
WARNING
Be sure to look over your shoulder before changing lanes: Changing
lanes without taking into account the actual distance of the vehicle in the convex
mirror is dangerous. You could have a serious accident. What you see in the convex
mirror is closer than it appears.
Mirror type
Flat ...
Mazda 6 Owners Manual: Advisory messages
You'll find several Warnings, Cautions, Notes, Specifications and Upper
and Lower Limits in this manual.
Warning
A Warning indicates a situation in which serious injury or death
could result if the warning is ignored.
Caution
A Caution indicates a situation in which damage to ...