Choosing The Right Fuel; Octane Recommendations - Ford Vehicle Owner's Manual

Choosing the Right Fuel

NOTE: Read the 7.3L Diesel Engine Owner
Guide Supplement for information
regarding correct fuel requirements for
your diesel-powered vehicle.
Use only UNLEADED FUEL in your vehicle.
Using leaded fuel is prohibited by federal law.
Your warranty may not apply if your vehicle is
damaged because you used the wrong fuel.
Vehicle inspection programs may detect
misfueling. Under these circumstances, you may
be required by law to make costly repairs at
your own expense.

Octane recommendations

Your vehicle is designed to use regular
unleaded fuel with an octane rating of 87. In
most cases, it is not necessary to use a fuel with
an octane rating higher than 87. At service
stations, the octane rating is displayed on a label
on the pumps.
Typical octane rating label
In some parts of the country, "regular" grade
fuels are sold with octane ratings of 86 or even
less, especially in high altitude areas. We
recommend that you do not use these fuels.
Always use a fuel with an octane rating of 87,
even if it is sold as a "midgrade" or "premium."
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