Mazda 2012 MX-5 Owner's Manual page 170

For cruising
5-speed
Gear
transmission
1 to 2 15 km/h (9 mph) 18 km/h (11 mph)
2 to 3 29 km/h (18 mph) 32 km/h (20 mph)
3 to 4 47 km/h (29 mph) 44 km/h (27 mph)
4 to 5 61 km/h (38 mph) 56 km/h (35 mph)
―
5 to 6
Downshifting
When you must slow down in heavy
traffic or on a steep upgrade, downshift
before the engine starts to overwork. This
reduces the chance of stalling and gives
better acceleration when you need more
speed.
On a steep downgrade, downshifting
helps maintain safe speed and prolongs
brake life.
6-speed
transmission
68 km/h (42 mph)
Driving Your Mazda
Starting and Driving
5-13