FORD 1998 Expedition - Manual (Page 183)

3. After at least three to five fuel
tank fill-ups, fill the fuel tank and
record the current mileage
reading.
4. Use one of the following
equations to calculate fuel
economy.
Liters used x 100
Ϭ Total
kilometers traveled
Total miles traveled
Ϭ Total
gallons used
Keep a record for at least one
month. This will provide an
accurate estimate of the vehicle’s
fuel economy.
EMISSION CONTROL SYSTEM
Your vehicle is equipped with
various emission control
components and a catalytic
converter which will enable your
vehicle to comply with applicable
exhaust emission standards. To
make sure that the catalytic
converter and other emission
control components continue to
work properly:
• Use only unleaded fuel.
• Avoid running out of fuel.
• Do not turn off the ignition
while your vehicle is moving,
especially at high speeds.
• Have the services listed in your
“Service Guide” performed
according to the specified
schedule.
The Scheduled Maintenance
Services listed in the “Service
Maintenance and care
183