2005 SAAB 9-3 fuel consumption

88 Instruments and controlsThe number of systems that are displayed
on the SID depends on the car’s equipment
level. The list shown below includes the
systems that can be found in your car.
Trip computer function of the SIDSID contains the following functions:
Park Assistance, page 178.
SPA onSPA off
Clock / Alarm, page 92.
Set ClockSet Alarm 08:30
Rain Sensor, page 101.
HighMediumLow
Climate System, page 117.
Rear DefrosterHeated SeatsFan SettingsAir DistributionA/C ModeDual/Single ZoneDefault Settings
System Settings, page 94.
LanguageUnitSpeed Scale Illum.Service Info
WARNING
It is strongly recommended that the SID
settings be changed only when the car is
stationary. The driver’s attention can
otherwise easily be distracted from the
road.
Te m pOutdoor temperature
D.T.E. Estimated range (distance to
empty fuel tank)
Fuel ØAverage fuel consumption
since function last reset
DateDate
DistDistance to destinations.
Function can also be used as
a trip meter
ArrivEstimated time of arrival
Speed Ø Average speed since func-
tion last reset
Speed WSpeed warning (chime)
ProCarManuals.com

161 Starting and driving
Lock-upThe transmission’s torque converter has a
lock-up function. This can lock the torque
converter, thus reducing the engine speed
and fuel consumption.Kick-downWhen the accelerator is pressed down fully,
a down change is made to optimize acceler-
ation, e.g. for overtaking.
Following this, the next higher gear will be
selected at the optimum engine speed,
unless you ease off the accelerator before
reaching this.
Driving in hilly country with a
heavy loadThe transmission fluid can overheat when
the gearbox is strained, for example, when
driving with a trailer on hilly roads. To avoid
the transmission fluid overheating, always
drive with the selector lever in the D posi-
tion. The adaptive gear change patterns are
then active.
High air temperatures or a faulty oil cooler
can also cause the transmission fluid to
overheat. Overheating reduces the service
life of the fluid.
TowingTowing of cars with automatic transmission,
see page 190.Descending hillsIf the speed of the car increases while
descending a steep hill, despite the acceler-
ator being released, the control module will
change down. If you desire more powerful
engine braking, manually select a lower
gear (see page 164).
WARNING
Remember to use the braking effect of the
engine (1st, 2nd or 3rd gear) when you
are descending long or steep hills to
spare the brakes.
Overheating can cause the brakes to
fade!
ProCarManuals.com

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

180 Starting and drivingengine wear is at its greatest during this
period. Drive off as soon as possible after
starting the engine and avoid high engine
speeds.
 Drive as smoothly and thoughtfully as
possible. Match your driving to the
prevailing traffic conditions.
 Driving in a low gear gives rise to higher
fuel consumption than driving in a high
gear because of the higher engine speed
for any given road speed. Always shift up
as soon as traffic conditions allow and
drive in the highest gear as much as
possible.
 Check the tire pressure once a month.
Incorrect tire pressure increases tire
wear. It is preferable for the tire pressure
to be slightly high than too low. Under-
pressure increases fuel consumption. Check the fuel consumption regularly.
Increased fuel consumption can indicate
that something is wrong and that the car
needs to be checked at a Saab dealer.
Practical road tests have demonstrated that
substantial savings in fuel consumption can
be made if the above advice is followed.
Road conditionsWet roads increase fuel consumption, as do
unpaved roads and driving in hilly country
(the amount of fuel saved driving downhill is
less than the additional amount required to
climb the hill).
Engine block heater (standard equipment in Canada, acces-
sory in U.S.)
The following are just some of the benefits
to the car and the environment of using an
engine block heater:
 Lower fuel consumption.
 Reduced wear on the engine.
 Inside of car warms up faster.
 Exhaust emissions substantially reduced
over short runs.
The engine heater is effective at outside
temperatures up to 60–70°F (+15–+20°C).
The warmer it is outside, the shorter the time
the engine heater needs to be connected.
Longer than 1.5 hours is unnecessary.
If the car is equipped with a removable,
electric cabin heater that is not in use, store
this in the trunk.
WARNING
Never switch off the engine while driving
as the effect of the brakes and power
steering will be greatly reduced.
ProCarManuals.com

200 Car careSaab Trionic engine
management systemThe Saab Trionic engine management
system is a unique Saab development that
combines sequential multiport fuel injection,
electronic distributorless ignition and turbo-
charger boost pressure control into one sys-
tem.
The Trionic engine control module (ECM)
monitors many different engine parameters
such as:
 Intake manifold pressure.
 Intake air temperature.
 Crankshaft position.
 Engine coolant temperature.
 Throttle position.
 The oxygen content of the exhaust gases.
The ECM receives information regarding
engine knocking from a sophisticated feed-
back function in the ignition discharge unit.
By processing all of this information, the Tri-
onic system can control fuel injector open-
ing duration, ignition timing and turbo-
charger boost pressure to provide excellent
engine performance while maintaining low
emissions and fuel consumption.
ORVR (Onboard Refueling Vapor
Recovery)All hydrocarbons formed when refueling will
be recovered by the car and not released
into the atmosphere. The hydrocarbons are
absorbed in an evaporative emission canis-
ter. When the engine is subsequently
started, the evaporative emission canister is
gradually purged as air is sucked into it
through a shut-off valve. The hydrocar-
bon/air mixture passes through the evap
canister purge valve and into the engine
where it is burned. “Refueling”, see
page 153.
When refueling, make sure you screw the
filler cap on and keep turning until it has
clicked 3 times.
NOTICEThe Trionic engine management system
continuously monitors the operation of
these systems and has on-board diag-
nostic capabilities (OBD II). If the Engine
malfunction (CHECK ENGINE) light in
the main instrument illuminates, the
Trionic ECM has detected a problem. The
car will continue to operate, but perfor-
mance may be diminished. You should
have your car checked by a Saab dealer
as soon as possible.
ProCarManuals.com

284 IndexDriving techniques
______________ 179
Driving with a heavy load on hilly
roads
________________________ 161
Driving with a load
_______________ 189
Driving with a roof load
___________ 188
Driving with the compact spare wheel
193
Driving with the trunk lid open
______ 189
EEDR (Event Data Recorders)
______ 266
ESP, anti-skid system
____________ 171
Easy entry, Convertible ____________ 67
Economical motoring
____________ 179
Electric engine heater ____________ 180
Electric heating, front seats
____ 107
, 116
Electric windows
________________ 123
Electric windows, Convertible
_______ 71
Electrical system, technical data ____ 272
Electrically adjustable seats
________ 19
Electronic Stability Program (ESP)
__ 171
Electronic steering wheel lock
______ 148
Emergency opening of the narrow
backrest
_____________________ 144
Emergency operation of the sunroof
_ 128
Engine bay, cleaning
_____________ 252
Engine heater
__________________ 180
Engine immobilizer
_______________ 49
Engine number
_________________ 278
Engine oil, checking
_____________ 202
Engine oil, grade
________________ 270Engine oil, volume
_______________ 271
Engine temperature gauge
_________ 84
Engine, description
______________ 199
Engine, technical data ____________ 270
Engines
_______________________ 271
Event Data Recorders (EDR)
______ 266
Extra electrical socket
____________ 132
FFacilitating entry to rear seat,
Convertible
____________________ 67
Factors affecting fuel consumption
__ 179
Filler cap
______________________ 154
Filling a portable fuel container
_____ 155
Filling up
______________________ 153
Flat spots, tires
_________________ 235
Floor jack
______________________ 249
Folding down the rear seat
________ 140
Front fog lights
__________________ 98
Front towing eye ________________ 190
Fuel container
__________________ 155
Fuel gauge
_____________________ 85
Fuel grade _____________________ 271
Fuel information
________________ 155
Functions, car alarm ______________ 53
Fuse panel in luggage compartment
_230
Fuse table
_____________________ 229
Fuses
________________________ 227
GGDO, garage door opener
_________ 136
Gear selector indicator, automatic trans-
mission
_______________________ 86
Gearbox number
________________ 278
General safety instructions, Convertible
56
Glovebox
______________________ 132
Glovebox lighting
________________ 224
HHandbrake
_____________________ 173
Hazard warning lights
_____________ 99
Head restraint, Convertible
_________ 68
Head restraints
__________________ 21
Headlight flasher _________________ 97
Headlight levelling ________________ 96
Headlights
______________________ 96
Heated door mirrors
_____________ 107
Hood
_________________________ 198
Horn __________________________ 122
Horn button
____________________ 122
IIf a tire goes flat
_________________ 240
Ignition switch
__________________ 146
Immobilizer
_____________________ 49
Important considerations for driving
_ 150
ProCarManuals.com