Operation
Think ahead and “flow” with the traffic
Frequent acceleration and braking considera-
bly increase fuel consumption. If you think
ahead as you drive and keep a safe distance
from the vehicle in front, it is possible to slow
down by simply lifting your foot off the accel-
erator. This eliminates the need for constant
braking and acceleration.
Calm and steady driving
Constancy is more important than speed: The
more you drive at a constant speed, the lower
the fuel consumption.
When driving on the motorway, it is more effi-
cient to drive at a constant and more moder-
ate speed than to be continuously accelerat-
ing and braking. As a general rule, you will
reach your destination just as quickly when
you drive at a constant speed.
The cruise control function helps you to ach-
ieve a constant style of driving.
Moderate use of additional devices
It is important to travel in comfort, but con-
venience systems should be used ecological-
ly.
Some equipment, when connected, increase
fuel consumption considerably, for example:
● Air conditioning cooling system: If the air
conditioning system is required to cool to
significantly lower temperatures than the true outside temperature, it will require a large
amount of energy from the engine. Therefore,
we recommend that the selected temperature
for the vehicle is not too different to the out-
side temperature. It is a good idea to air the
vehicle before starting your journey and to
drive a short distance with all the windows
open. Only then should you close all the win-
dows and switch on the air conditioning.
Keep windows closed when travelling at high
speeds. Driving with the windows open in-
creases fuel consumption.
●
Switch off the seat heating when the seats
have warmed up.
● Switch off the heated rear window and the
windscreen heating when the windows have
demisted and are free of ice.
● Do not leave the auxiliary heater switched
on when the vehicle is moving ››› page 128.
Avoid short journeys
Fuel consumption is much higher when the
engine is cold, immediately after it has been
started. It takes a few kilometres of driving
for the engine to warm up and to normalise
consumption.
The engine and catalytic converter need to
reach their proper working temperature in or-
der t o minimi
se fuel consumption and emis-
sions. The ambient temperature has a deci-
sive influence. Fig. 133 shows the difference in consump-
tion for the same journey at +20 °C (+68 °F)
and at -10 °C (+14 °F).
Therefore, unnecessary short journeys
should be avoided. Try to combine trips.
The vehicle uses more fuel in winter than in
summer, even when other conditions are the
same.
“Warming” the engine is not only forbidden
in some countries, but in practice it is techni-
cally superfluous as it is a waste of fuel.
Adjusting type pressures.
Having the correct pressure in your tyres
helps to reduce rolling resistance and, as a
result reduces fuel consumption. Increasing
the tyre pressure slightly (+0.2 bar
[2.9 psi/20 kPa]) can help to save fuel.
If you are prepared to accept a slight reduc-
tion in comfort, the tyres may be filled to the
pressures recommended for a fully-loaded
vehicle. This is also valid when driving alone
without luggage.
When you buy new tyres, make sure they are
optimised for minimum rolling resistance.
Use low friction engine oil
The use of low viscosity totally synthetic oils,
known as low friction engine oil, helps to re-
duce fuel consumption. These oils reduce the
resistance caused by friction in the engine,
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