higher gear to bring engine rpm
within the optimum speed range.
• When driving downhill: shift to a
lower gear, use the engine brake (if
so equipped), and use the service
brake, keeping the engine speed
below 2,100 rpm.
When the engine speed reaches its
maximum governed speed, the injection
pump governor cuts off fuel to the engine.
However, the governor has no control over
the engine rpm when it is being driven by
the vehicle's transmission, for example, on
steep downgrades. Apply service brakes or
shift to a higher gear. Fuel economy and
engine performance are also directly
related to driving habits:
• The best results in trip time and
fuel economy are obtained while
driving the vehicle at a steady
speed.
• Shift into higher or lower gears (or
apply the service brake) to keep
engine rpm near the lower end of
the optimum operating range.
• Avoid rapid acceleration and
braking.
WARNING
DO NOT look at the Digital Display for
prolonged periods while the vehicle is
moving. The Digital Display should be
referenced only briefly and should not
be used as a substitute for observing
actual road and traffic conditions. Fail-
ure to pay attention to the vehicle’s
road position or situation can lead to
an accident and possibly result in
property damage, personal injury, or
death.
Fuel Consumption
The vehicle's fuel consumption is
connected to five important factors:
maintenance, driving habits, general
condition of the road, traffic conditions, and
vehicle load.
Proper maintenance will keep the vehicle
running like new even after long periods of
use. The driver must perform daily and
weekly checks of the vehicle.
Maintenance factors affecting fuel
consumption:
• air and/or fuel filters partially
clogged
• engine valves out of adjustment
• injection pump improperly
synchronized
• injection nozzles defective or
uncalibrated
• improperly inflated tires
• wheel bearings improperly adjusted
• clutch improperly adjusted or worn
(slipping)
• fuel leaks
Wrong driving habits must be corrected
and the recommendations on economic
driving should be followed. Driving factors
affecting fuel consumption:
• excessive speed and unnecessary
fast acceleration
• long periods of idling
• driving with foot resting on the
(manual transmission) clutch pedal
General Condition Other factors affecting
fuel consumption are related to loads and
type of roads on which the vehicle
operates. It is not always possible to
choose the most adequate road, but it
must be kept in mind that the ideal road is
the one that allows a steady speed in high
gear, without requiring frequent braking
and acceleration. The following general
conditions can affect fuel consumption:
• overload
DRIVING - Driving Tips and Techniques
160 Y53-6076-1D1 (09/20)
4
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