Press button h. Each pulse on the button will obtain increase by one unit. Automatic fast increase is obtained by keeping the button pressed for few seconds. When you are near the required value, release the button and complete adjustment with single presses.

See also:
Performance
Top admitted speed after initial car use in km/h.
...
Interiors
Periodically check that water is not trapped under the mats (due to water dripping
off shoes, umbrellas, etc.) which could cause oxidisation of the sheet metal.
CLEANING SEATS AND FABRIC AND VELVET ...
Electronic Speed Control
When engaged, the Electronic Speed Control takes over accelerator operations
at speeds greater than 25 mph (40 km/h).
The Electronic Speed Control buttons are located on the right side of the steer ...


