Speed-increase Setting

WARNING: This page is about a different car, the 2004 Mitsubishi Eclipse. However, it is still accessible from the selected car via links, so may be relevant.

Set to the desired speed.
Push the auto-cruise control switch in the direction of arrow.

Fig 1: Identifying Speed-Increase Setting
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Check to be sure that acceleration continues while the switch is held, and that after it is released the constant speed at the time when it was released becomes the driving speed.
NOTE: Acceleration can be continued even if the vehicle speed has passed the high-speed limit [approximately 200 km/h (124 mph)]. But the speed when the auto-cruise control switch is released will be recorded as the high-speed limit.