Subaru BRZ 2017 Owner's Manual page 226

2-4. Using other driving systems
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Adjusting the set speed
To change the set speed, operate the lever until the desired set
speed is obtained.
The set speed will be increased or decreased as follows:
Fine adjustment (vehicles with a km/h odometer display): By approxi-
mately 1 km/h (0.6 mph) each time the lever is operated.
Fine adjustment (vehicles with an mph odometer display): By approxi-
mately 1 mph (1.6 km/h) each time the lever is operated.
Large adjustment: The vehicle speed can be increased or decreased
continually until the lever is released. Then, release the lever. The vehi-
cle speed at that moment will be memorized and treated as the new set
speed.
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Increases the speed
Decreases the speed
Fine adjustment: Momentarily
move the lever in the desired
direction.
Large adjustment: Hold the
lever in the desired direction.