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: Clutch pedal adjustment
Clutch Pedal Height Measure the distance from the upper surface of the pedal pad to the carpet. If not as specified, adjust the pedal height by turning adjustment bolt B and locknut A. Pedal height(with carpet) L.H.D.: 210-216 mm {8.27-8.50 in} R.H.D.: 209-215 mm {8.23-8.46 in} ...

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: ...