Octane recommendations

“Regular” unleaded gasoline with a pump (R+M)/2 octane rating of 87 is recommended. Some stations offer fuels posted as “Regular” with an octane rating below 87, particularly in high altitude areas. Fuels with octane levels below 87 are not recommended.

Do not be concerned if your engine sometimes knocks lightly. However, if it knocks heavily under most driving conditions while you are using fuel with the recommended octane rating, see your authorized dealer to prevent any engine damage.
See also:
Disengaging adaptive cruise control
Press the brake pedal or press CNCL to disengage the adaptive cruise
control. The last set speed will be displayed with a strikethrough.
Disengaging the adaptive cruise control will not erase you ...
Safety
The MKX has the standard slate of six airbags, stability control and, as part
of some option packages, blindspot monitoring.
The 2011 MKX earned the top score, Good, in frontal, side and rear cras ...
Reaking-in your vehicle
Your vehicle does not need an extensive break-in. Try not to drive
continuously at the same speed for the first 1,000 miles (1,600 km) of
new vehicle operation. Vary your speed frequently in order ...
