Fuel And Refueling; Fuel Quality - Ford Fiesta ST Supplement Manual

Fuel and Refueling

FUEL QUALITY

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. Premium fuel will provide
improved performance and is
recommended for severe duty usage such
as trailer tow.
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Fiesta (CCT)