ECONOMICAL DRIVING
Your fuel economy is affected by severalthings, such as how you drive, theconditions you drive under, and how youmaintain your vehicle.
You may improve your fuel economy bykeeping these things in mind:
•Accelerate and slow down in a smooth,moderate fashion.
•Drive at steady speeds withoutstopping.
•Anticipate stops; slowing down mayeliminate the need to stop.
•Close the windows for high-speeddriving.
•Drive at reasonable speeds. Travelingat 55 mph (90 km/h) uses 15% lessfuel than traveling at 65 mph(105 km/h).
•Keep the tires properly inflated and useonly the recommended size.
•Use the recommended engine oil.
•Perform all regularly scheduledmaintenance.
Avoid these actions; they reduce your fueleconomy:
•Sudden accelerations or hardaccelerations.
•Warm up your vehicle on coldmornings.
•Use the air conditioner.
•Use the speed control in hilly terrain.
•Rest your foot on the brake pedal whiledriving.
•Carry unnecessary weight.Approximately 1 mpg [0.4 km/L] is lostfor every 400 lb (180 kg) of weightcarried.
•Driving with the wheels out ofalignment.
Conditions
•Adding certain accessories to yourvehicle may reduce fuel economy. Forexample bug deflectors, rollbars, lightbars, running boards, ski racks orluggage racks.
•Using fuel blended with alcohol maylower fuel economy.
•Fuel economy may decrease with lowertemperatures during the first 5–10 mi(12–16 km) of driving.
•Driving on flat terrain offers improvedfuel economy as compared to drivingon hilly terrain.
•Transmissions give their best fueleconomy when operated in the topcruise gear and with steady pressureon the gas pedal.
COLD WEATHER
PRECAUTIONS - 6.7L DIESEL
Winter Grille Cover (If Equipped)
The winter grille cover enhances heaterperformance and will reduce the amountof time it takes to warm the inside of yourvehicle in extremely cold conditions below-0.4°F (-18°C).
The winter grille cover installs over theoutside of the front grille and restricts theair flowing to the engine compartment bycovering the radiator grille openings.
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Note:The grille cover must be installed inextremely cold conditions below 10.4°F(-12°C) to prevent possible engine damage.
Usage Guidelines
The winter grille cover should only be usedwhile operating your vehicle in extremelycold temperatures or in heavy snow forextended periods of time. In thesetemperatures, the vehicle does not needa large amount of air to properly cool theengine. During periods of operation whenmore airflow is required to cool the vehicle,the winter grille cover should not be used.
The following usage guidelines will allowadequate airflow for proper radiator andair cooler performance:
•Do not use the cover whentemperatures are above 50.0°F (10°C).Use of the cover in these conditionscould cause your vehicle to overheat.Remove the cover if the vehicleoverheats.
•Do not use the cover above 32.0°F(0°C) if towing a trailer. Your vehiclemay overheat if the cover is used whiletowing a trailer.
•Do not modify the cover.
Installation Instructions
Installation and removal instructions areincluded in the winter grille cover package.Refer to the usage guidelines tounderstand when to use the cover.
The cover will seem undersized during thefirst installation, which is normal. The coverstretches during installation to ensure atight fit. The first installation is bestperformed when the grille cover is warm.
COLD WEATHER
PRECAUTIONS - 7.3L
The functional operation of somecomponents and systems can be affectedat temperatures below approximately-13°F (-25°C).
BREAKING-IN
You need to break in new tires forapproximately 300 mi (480 km). Duringthis time, your vehicle may exhibit someunusual driving characteristics.
Avoid driving too fast during the first1,000 mi (1,600 km). Vary your speedfrequently and change up through thegears early. Do not labor the engine.
Drive your new vehicle at least 1,000 mi(1,600 km) before towing a trailer. Makesure you use the specified engine oil. SeeEngine Oil Capacity and Specification(page 296).
Do not add friction modifier compoundsor special break-in oils during the first fewthousand miles (kilometers) of operation.These additives may prevent piston ringseating.
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