Mazda 6 Service Manual: No.14 poor fuel economy

No.13 knocking/pinging-acceleration/cruise

No.15 emission compliance

Other materials:

Mazda 6 Service Manual: Intermittent concern troubleshooting
  Vibration Method 1. If malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the steps below. Note There are several reasons vehicle or engine vibration could cause an electrical malfunction. Some of the things to check for are: ...

Mazda 6 Service Manual: Height Adjustment
Adjust the head restraint so that the center is even with the top of the passenger's ears. To raise a head restraint, pull it up to the desired position. To lower the head restraint, press the stopcatch release, then push the head restraint down. Front outboard seat Rear outboard seat ...