owners manual Saab 9-3

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Starting and driving179 Economical driving How to read the diagram: If fuel consumption with the engine at Factors affecting fuel normal temperature is 28 mpg (10 l/ consumption 100km), the actual fuel consumption The fuel consumption of a car is greatly 3 miles (5 km) after the engine has started affected by driving conditions, climate, road from cold will be: conditions, speed, driving technique, etc.– 23.5 mpg (12 l/100 km) at outside temp. of 68°F (+20°C) (increase of 20%). Breaking-in – 17.7 mpg (16 l/100 km) at outside temp. Fuel consumption may be somewhat of 32°F (0°C) (increase of 60%). higher during the break-in period (the – 14 mpg (20 l/100 km) at outside temp. first 3,000–4,000 miles (5,000–7,000 km)).of –4°F (–20°C) (increase of 100%). It is clear from the diagram that both dis- Weather conditions tance driven and outside temperature have Percentage increase in fuel consumption Summer temperatures give better fuel a significant impact on fuel consumption, of engine starting from cold compared to economy than winter ones. The difference after a cold start.engine at normal temperature. can be as much as about 10%. Consump-If the car is normally driven on short jour- tion increases in cold weather because the neys, 3–5 miles (5–8 km), for example to engine takes longer to reach its normal and from work, the average consumption operating temperature. The transmission will be 60–80% above the normal level.Driving techniques and wheel bearings also take longer to warm up. Even distance affects consump- • To obtain the best running economy, with tion: short journeys of 3–5 miles (5–8 km) regard to fuel consumption and general do not give the engine enough time to wear, the car must be serviced regularly. reach its optimum temperature. Wind con- • High speed, unnecessary acceleration, ditions also have a marked effect on fuel frequent braking and much changing consumption. down all give higher fuel consumption. • Frequent gear changing in traffic, starting in cold weather, the use of studded tires and roof racks, and towing a camper all increase fuel consumption. • Do not warm up the engine while the car is stationary. If idling, the engine will take much longer to reach its optimum temperature, and

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