Auto-Cruise Control Setting

Switch the "ON/OFF" switch to "ON".
Drive at the desired speed, above approximately 40 km/h (25 mph).
Push the "COAST/SET" switch.
Check to be sure that when the "COAST/SET" switch is released the speed is the constant speed.
NOTE: If the vehicle speed decreases to approximately 15 km/h (9 mph) below the set speed because of climbing a hill for example, it is normal for the auto-cruise control to be cancelled. When the vehicle speed becomes approximately 40 km/h (25 mph) or less, driving at constant speed will be cancelled even if the vehicle speed does not decrease 15 km/h (9 mph) or more.

Fig 1: Identifying Auto-Cruise Control Switch - COAST/SET
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.