Ford Vehicle Owner's Manual page 370

To make sure that the catalytic converter and the
other emission control parts 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 the Maintenance
Schedule and Record booklet performed
according to the specified schedule. The
scheduled maintenance services are required
because they are considered essential to the
life and performance of your vehicle and to
its emissions system.
In general, maintenance, replacement, or service
of the emissions control devices or systems in
your new Ford Motor Company vehicle or
engine may be performed at your expense by
any automotive repair establishment or
individual using automotive parts equivalent to
those which your vehicle or engine was
originally equipped.
Do not park, idle, or drive your vehicle in
dry grass or other dry ground cover. The
emission system heats up the engine
compartment and exhaust system, which
can start a fire.
On vehicles without original equipment
floor covering or insulation, do not let
passengers ride in your truck in a manner
that allows contact between skin and the
metal floor.
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