2015 Ford Expedition EL Owner Manual Printing 1 - Page 187

186 Fuel and Refueling • Fuels containing the octane booster additive, methylcyclopentadienyl manganese tricarbonyl (MMT). • Leaded-fuel (The use of leaded fuel is prohibited by law). Note: Use of any fuel other than recommended fuel can cause powertrain damage, impair the emission control system or cause loss of vehicle performance. Any damage to the vehicle that is caused by the use of fuel not recommended will not be covered under warranty. 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 (R+M)/2 METHOD 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. 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. 87 RUNNING OUT OF FUEL Avoid running out of fuel because this situation may have an adverse effect on powertrain components. If you have run out of fuel: • You may need to cycle the ignition from off to on several times after refueling to allow the fuel system to pump the fuel from the tank to the engine. On restarting, cranking time will take a few seconds longer than normal. • Normally, adding 1 gallon (3.8L) of fuel is enough to restart the engine. If the vehicle is out of fuel and on a steep grade, more than 1 gallon (3.8L) may be required. • The service engine soon indicator may come on. For more information on the service engine soon indicator, refer to the Instrument Cluster chapter. See Settings in the Instrument Cluster chapter for information on calculating DTE (Distance to empty).