Ford Mystique Owner's Manual page 208

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Maintenance and Care
Octane recommendation
Your vehicle is designed to use regular gasoline with an
(R+M)/2 octane rating of 87. We do not recommend gasolines
labeled as "regular" in high altitude areas that are sold with
octane ratings of 86 or even less.
Typical octane rating label
Do not be concerned if your vehicle sometimes knocks lightly.
However, if it knocks heavily under most driving conditions on
the recommended octane fuel, see your dealer or a qualified
service technician to prevent any engine damage.
209

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