Starting and driving
153
Economical motoring
theenginehasstartedfromcold.Thus,ifthe
car is mainly used for short journeys of
3–5 miles (5–8 km), the fuel consumption
will be 60–80 % higher than normal.
Factors affecting fuel consumption
Fuel consumption is greatly affected by the
general driving conditions, the way in which
the car is driven and at what speeds, the
weather, the state of the road, the condition
of the car, etc.
Driving technique
•
•
•
To obtain the best running economy, not
only regarding fuel consumption but gen-
eral wear also, regular service is required.
High speed, unnecessary acceleration,
heavybrakingand muchlow gear work all
gives rise to higher fuel consumption.
Frequent gear changing in traffic, starting
in cold weather, the use of studded tires
and roof racks, and towing a trailer all
increase fuel consumption.
Breaking-in
Fuelconsumptionmaybe somewhathigher
during the break-in period (the first 3,000–
4,000
miles (5,000–7,000 km) than stated
under ”Technical data”.
Weather conditions
Fuel consumption can be as much as 10 %
lower in summer than in winter. The higher
consumptionincoldweatherisexplainedby
the longer time it takes for the engine to
reach normal operating temperature, and
for the transmission and wheel bearings to
warm up. Fuel economy is also affected by
the distance driven: short journeys of
Percentage increase in fuel consumption
of engine starting from cold compared to
engine at normal temperature
• Do not run the engine when the car is sta-
tionary.
If idling, it will take much longer before the
engine becomes hot. Engine wear is
greatest during this warming-up phase.
Therefore drive away as soon as possible
after the engine is started and avoid high
revving.
How to read the graph:
If fuel consumption with the engine at
normal temperature is 28 mpg
3-5
miles (5-8 km) do not give the engine
(10l/100
km), the actual fuel consumption 3
enough time to reach normal temperature.
Strong winds can also affect fuel consump-
tion.
miles (5 km) after the engine has started
from cold will be:
–
–
–
23.5 mpg (12l/100 km) at outside temp.
of 68°F (20°C) (increase of 20%)
17.7 mpg (16l/100 km) at outside temp.
of 32°F (0°C) (increase of 60%)
14 mpg (20l/100 km)) at outside temp. of
–4°F
(–20°C) (increase of 100%)
As can be seen, both the distance travelled
bythecarandtheoutsidetemperaturehave
a major impact on fuel consumption after
| Categories | Saab 9-3 Manuals, Saab Manuals |
|---|---|
| Tags | Saab 9-3 M2000 |
| Model Year | 2000 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(0 votes, average: 0 out of 5)