Mazda 6 Service Manual: No.11 shift point is high or low

No.10 frequent shifting

No.12 torque converter clutch (tcc) non-operation

Other materials:

Mazda 6 Service Manual: Manual Transaxle Shift Pattern
  The shift pattern of the transaxle is conventional, as shown. Depress the clutch pedal all the way down while shifting; then release it slowly. Your vehicle is equipped with a device to prevent shifting to R (reverse) by mistake. Push the shift lever downward and shift to R.   ...

Mazda 6 Service Manual: Replacing a Wheel
WARNING Always use wheels of the correct size on your vehicle: Using a wrong-sized wheel is dangerous. Braking and handling could be affected, leading to loss of control and an accident. CAUTION A wrong-sized wheel may adversely affect: Tire fit Wheel and bearing life Ground clearance ...