Mazda 3 2019 Owner's Manual page 180

When Driving
Automatic Transmission
▼ Recommendations for Shifting
Upshifting
For normal acceleration and cruising, Mazda recommends these shift points:
(U.S.A. and Canada)
Gear
M1 to M2
M2 to M3
M3 to M4
M4 to M5
M5 to M6
*
1 Always observe local speed limit regulations.
Downshifting
When you must slow down in heavy traffic or on a steep upgrade, downshift before the
engine starts to overwork. This gives better acceleration when you need more speed.
On a steep downgrade, downshifting helps maintain safe speed and prolongs brake life.
4-40
24 km/h (15 mph)
40 km/h (25 mph)
65 km/h (40 mph)
73 km/h (45 mph)
81 km/h (50 mph)
*1
Vehicle speed