Manual Saab 9-5 - 2003 (page 178 of 288) (English)

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178 Starting and driving

Economical motoring

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.

Breaking-in

Fuel consumption may be somewhat higher

during the break-in period (the first 3,000–

4,000 miles (5,000–7,000 km) than stated.

Weather conditions

Fuel consumption can be as much as 10 %

lower in summer than in winter. The higher

consumption in cold weather is explained by

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 3–

5 miles (5–8 km) do not give the engine

enough time to reach normal temperature.

Strong winds can also affect fuel consump-

tion.

How to read the graph above:

If fuel consumption with the engine at

normal temperature is 28 mpg

(10l/100 km), the actual fuel consumption 3

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

by the car and the outside temperature have

a major impact on fuel consumption after

the engine has started from cold. Thus, if the

car is mainly used for short journeys of

3–5 miles (5–8 km), the fuel consumption

will be 60–80 % higher than normal.

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,

heavy braking and much low 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.

• 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.

IB311

Percentage increase in fuel consumption

of engine starting from cold compared to

engine at normal temperature.

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Saab 9-5 - 2003 Manual

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