2014 MERCEDES-BENZ C-CLASS SALOON fuel consumption

R
you have switched on the turn signals. In
this event, the warnings are suppressed
for a certain period of time.
R a driving safety system intervenes, such
as ABS, BAS or ESP ®
.
R you accelerate hard, e.g. kickdown.
R you brake hard.
R you steer actively, e.g. swerve to avoid an
obstacle or change lane quickly.
R you cut the corner on a sharp bend.
In order that you are warned only when nec-
essary and in good time if you cross the lane marking, the system recognises certain con-
ditions and warns you accordingly.
The warning vibration occurs earlier if:
R you approach the outer lane marking on a
bend.
R the road has very wide lanes, e.g. a motor-
way.
R the system recognises solid lane markings.
The warning vibration occurs later if:
R the road has narrow lanes.
R you cut the corner on a bend.
Towing a trailer
If you couple up a trailer, make sure that you have correctly established the electrical con-
nection. This can be accomplished by check- ing the trailer lighting. Hybrid operation
Points to remember
General notes Hybrid technology combines a fuel efficient
internal combustion engine with a powerful
electric motor. The hybrid system automati-
cally selects the most efficient operating
mode for every driving situation. Drive the
vehicle in the usual manner.
To save fuel, the hybrid system switches off
the combustion engine as often as possible
during the journey when power output requirements are low. When power output
requirements are low, the electric motor pow-
ers the vehicle. When power output require-
ments are high, the combustion engine is
switched on, even during a journey. When the vehicle is stationary, the combustion engine
is usually switched off. Consequently, there is
usually no engine idling as with combustion
engine vehicles.
For pulling away and accelerating, the electric motor supports the internal combustion
engine using the power stored in the high-
voltage battery. In addition, the power is used
for partially electric driving, operation of the
electric coolant compressor and to support
the 12 V on-board electrical system. In this
way the hybrid drive helps to reduce your
vehicle's fuel consumption.
Observe the driving tips on hybrid operation
(Y page 278).
RBS (Recuperative Brake System) If you release the accelerator pedal when the
vehicle is in motion, overrun recuperation is
initiated. The electric motor is operated as a
generator when in overrun mode and when
you brake. Hybrid technology converts the
kinetic energy of the vehicle into electricity
and stores it in the high-voltage battery. Important safety notes
All of the vehicle's systems remain active, if: R the vehicle is stationary,
R the combustion engine is switched off and
R the READY-indicator in the instrument clus-
ter is lit.
If you remove your foot from the brake pedal
while in transmission position D or R, the
vehicle could pull away automatically.
Observe the notes on the READY display of
the ECO start/stop function (Y page 279).
Vehicles with an electric motor generate sig-
nificantly less noise than vehicles with inter-
nal combustion engines. As a result, in certain Hybrid operation
269Driving and parking Z

This shows the electric output from the
electric motor, e.g. when driving using the
electric motor or in boost mode.
When the motor is switched on, the display is at :. When driving solely on electricity,
the display fills up from :to; depending
on the power output demanded as a result
of pressing the accelerator pedal.
If the display has reached limit ;, addi-
tional power output can only be provided by
the combustion engine. The combustion
engine starts. If the display is approaching
limit ;and you remove your foot from the
accelerator pedal, the display empties
again. The combustion engine is not
switched on. At low speeds, you can
thereby control the electric drive usage so
that you only drive in electric mode.
R Area =to? (CHARGE):
This shows the recuperated energy which is
stored in the high-voltage battery as elec-
trical energy.
When the display reaches limit ?, the max-
imum recuperative braking power has been exhausted. The conventional brakes are
activated.
Operating the on-board computer You can display the current operating condi-
tion of the hybrid system in the multifunction
display and the COMAND display
(Y page 273).
You can display the current operating condi-
tion of the hybrid system in the multifunction display and the Audio 20/COMAND Online
display (Y page 273).
In the Audio 20/COMAND Online display, you
can also call up a graphic display of the fuel
consumption and generated electricity
(Y page 276). Menus and submenus
Selecting messages in the Audio 20/
COMAND Online display X
Press the Øbutton on the controller.
The vehicle menu appears.
X To select Energy Energyflow
flow: turn and press the
controller.
The energy flow is displayed.
X To select Consumption Consumption: turn and press the
controller.
Fuel consumption and the electric energy
generated are displayed.
X To exit the display: press the %button
on the controller.
Selecting the energy flow display in the multifunction display X
Use Ñ on the steering wheel to call up
the list of menus.
X Press the :or9 button on the steer-
ing wheel to select the Trip Tripmenu.
X Confirm by pressing aon the steering
wheel.
X Use : or9 to select Energy flow
Energy flow .
The energy flow is displayed.
Energy flow display Overview
:
Internal combustion engine
; Electric motor
= Charge status of the high-voltage battery Hybrid operation
273Driving and parking Z

Driving using the electric motor and
charging the high-voltage battery The electric motor is being operated as an
alternator, e.g. in overrun mode and when
braking. The kinetic energy of the vehicle is
converted into electrical energy. The high-
voltage battery is charging.
The arrows for the energy flow are shown in
green. The combustion engine is shown in
dark grey.
Displaying the total range The approximate range is based on the cur-
rent driving style.
X Use Ñ on the steering wheel to call up
the list of menus.
X Press the :or9 button on the steer-
ing wheel to select the Trip
Trip menu.
X Confirm by pressing aon the steering
wheel.
X Press :or9 to select the approxi-
mate total range. Displaying fuel consumption and gen-
erated electrical energy
:
Fuel consumption
; Electrical energy generated
Every bar of the graph displays the average
value for one minute.
Fuel consumption indicator :may differ
from the indicator in the From start
From start trip
computer in the Trip Tripmenu.
To reset values: the values are reset along
with the From start
From start trip computer
(Y page 299).
X To select Consumption
Consumption: turn and press the
controller.
The Audio 20/COMAND Online display
shows fuel consumption :and electrical
energy generated ;for the last
15 minutes driven. Starting the engine
READY indicator X
Switch the ignition on.
X Depress the brake pedal. 276
Hybrid operationDriving and pa
rking

S
Sport R
Sporty driving style with
boost mode
R Electric-only drive is not
possible
R The ECO start/stop
function is not available C
Comfort R
Comfortable, economi-
cal driving style
R Electric-only drive is
possible
R The ECO start/stop
function is available E
Eco R
Particularly economical
driving style
R Electric operation mode
is used as often as pos-
sible
R The ECO start/stop
function is available Additional information for drive programs
(Y page 197).
Using the steering wheel gearshift paddles,
you can temporarily change gear yourself.
Further information on the manual drive pro-
gram (Y page 278).
Manual gearshifting
Using the steering wheel gearshift paddles,
you can temporarily change gear yourself.
The transmission must be in position D. Elec-
tric-only operation is not possible when man-
ually changing gear.
Activating when driving with the electric
motor:
X Pull the left-hand steering wheel gearshift
paddle (Y page 198).
The combustion engine is switched on.
Manual gearshifting is activated tempora-
rily. The selected gear and Mappear in the
multifunction display.
Pulling on the right-hand steering wheel
gearshift paddle when manual gear chang- ing is not active switches to overrun mode
(Y page 280).
Activating when driving with the combustion
engine:
X Pull the left-hand steering wheel gearshift
paddle (Y page 198).
Manual gearshifting is activated tempora-
rily. The selected gear and Mappear in the
multifunction display.
The ECO start/stop function is not available
when manually changing gear.
Further information on the manual drive pro-
gram (Y page 198).
Driving tips General driving tips
Drive carefully and maintain a suitable dis-
tance from the vehicle in front. Avoid frequent
and sudden acceleration as well as abrupt
braking.
During partially electric driving, pulling away
and acceleration, the electric motor supports the internal combustion engine.
During overrun in transmission position Dand
braking, the electric motor operates as an
alternator.
To reduce fuel consumption, use:
R recuperative braking (Y page 269)
R overrun mode (Y page 280) or extended
overrun mode (Y page 280)
For further information on the ECO start/stop
function; see (Y page 279).
Additional driving tips (Y page 211).
Stationary vehicle
If the vehicle is stopped, the combustion
engine is, for the most part, switched off.
Automatic climate control continues to func-
tion. The electro-mechanically assisted steer-
ing gear allows use of the power steering
without loss of comfort. 278
Hybrid operationDriving and parking

Acceleration
Depending on the operating mode, pulling
away and driving under low load conditions
are performed:
R entirely by electric propulsion
R in combination with the internal combus-
tion engine
When accelerating at an increased or full
load, boost mode is utilised. The electric
motor supports the internal combustion
engine by providing additional torque when
the accelerator is depressed rapidly.
Overrun mode or braking
There are three possible operating modes
when the hybrid vehicle is decelerating: R When coasting and decelerating, energy
recuperation is already taking place
(Y page 269). The electric motor functions
as an alternator and stores the recuperated
energy in the high-voltage battery.
R When braking gently, the electric motor
increases the deceleration of the vehicle.
Energy recuperation is increased
(Y page 269). The electric motor functions
as an alternator and stores the recuperated energy in the high-voltage battery.
R During heavy braking, the service brake is
also used to slow down the vehicle. Both
systems work together.
Driving in the city
Energy is recuperated during frequent decel-
eration and stopping in city traffic.
The vehicle can be driven by the electric
motor alone up to a speed of approximately
35 km/h, e.g.:
R while approaching a traffic light
R in stop-and-start traffic
The vehicle is driven by the electric motor
alone only when all conditions for the auto-
matic engine switch-off are fulfilled.
Further information on the automatic engine
switch-off (Y page 280). Driving on inter-urban roads
Three phases are possible when driving on
inter-urban roads:
R rapid acceleration (boost mode)
R constant energy consumption
R energy recuperation
Depending on the characteristics of the
route, there may be a lot of recuperated
energy available. This reduces consumption
and emissions.
Driving on the motorway
When driving on a motorway, the following
have a particularly positive effect on fuel con- sumption and emissions:
R the decrease in wasted power when using
recuperative braking
R the decrease in wasted power in overrun
mode when the combustion engine is
switched off
Manoeuvring and turning
The hybrid drive makes it possible to manoeu- vre and turn solely using the electric motor.
ECO start/stop function General notes
The ECO start/stop function switches the
internal combustion engine off automatically
when the vehicle stops moving and at high
speeds (Y page 280).
All vehicle systems remain active, e.g. the
automatic climate control.
The ECO start/stop function is only available in drive programs C,Eand I. Electric-only
operation is only possible in drive programs C
and E. Hybrid operation
279Driving and parking Z

Trip menu
Standard display X
Press and hold the %button on the
steering wheel until the Trip
Tripmenu with
trip meter :and total distance
recorder ;is shown.
Displaying the range and current fuel
consumption X
Use ò on the steering wheel to call up
the list of menus.
X Press the :or9 button on the steer-
ing wheel to select the Trip
Tripmenu.
X Confirm by pressing aon the steering
wheel.
X Press the :or9 button to select
approximate range :and current fuel con-
sumption ;.
Approximate range :that can be covered is
calculated according to your current driving
style and the amount of fuel in the tank. If
there is only a small amount of fuel left in the fuel tank, the display shows a vehicle being refuelled
Cinstead of approximate
range :.
Recuperation display =shows you if energy
has been recuperated from the kinetic energy
in overrun mode and saved in the battery.
Recuperation display =depends on the
engine installed and is therefore not available
in all vehicles.
Information on the total electric range in
hybrid vehicles can be found in the "Hybrid
drive" section (Y page 276).
ECO display X
Use ò on the steering wheel to call up
the list of menus.
X Press the :or9 button on the steer-
ing wheel to select the Trip Tripmenu.
X Confirm by pressing aon the steering
wheel.
X Use the :or9 button to select ECO
DISPLAY.
If the ignition remains switched off for longer than four hours, the ECO display will be auto-
matically reset.
For further information on the ECO display,
see (Y page 211). 298
Menus and submenusOn-board computer and displays

Trip computer "From start" or "From
reset" :
Distance
; Duration
= Average speed
? Average fuel consumption
X Use ò on the steering wheel to call up
the list of menus.
X Press the :or9 button on the steer-
ing wheel to select the Trip
Tripmenu.
X Confirm by pressing aon the steering
wheel.
X Press the :or9 button to select
From start
From start orFrom reset
From reset.
The values in the From start
From startsubmenu are
calculated from the start of a journey whilst
the values in the From reset
From reset submenu are
calculated from the last time the submenu
was reset (Y page 299).
The From start
From start trip computer is automati-
cally reset if:
R the ignition has been switched off for more
than four hours.
R 999 hours have been exceeded.
R 9,999 kilometres have been exceeded.
The From reset
From reset trip computer is automati-
cally reset if the value exceeds 9,999 hours or
99,999 kilometres. Digital speedometer
X
Use ò on the steering wheel to call up
the list of menus.
X Press the :or9 button on the steer-
ing wheel to select the Trip
Tripmenu.
X Confirm by pressing aon the steering
wheel.
X Press the :or9 button to select the
digital speedometer.
Resetting values X
Use ò on the steering wheel to call up
the list of menus.
X Press the :or9 button on the steer-
ing wheel to select the Trip
Tripmenu.
X Confirm by pressing aon the steering
wheel.
X Press the :or9 button to select the
function that you wish to reset.
X Press the abutton.
X Press the :button to select Yes
Yesand
press the abutton to confirm. Menus and submenus
299On-board computer and displays Z

Use a suitable pressure gauge to check the
tyre pressure. The outer appearance of a tyre does not permit any reliable conclusion aboutthe tyre pressure. On vehicles fitted with the
electronic tyre pressure monitor, the tyre
pressure can be checked using the on-board
computer.
If possible, only correct tyre pressures when
the tyres are cold.
The tyres are cold:
R if the vehicle has been parked with the tyres
out of direct sunlight for at least three
hours and
R if the vehicle has not been driven further
than 1.6 km
Depending on the ambient temperature, the
speed at which you are driving and the load on the tyres, the tyre temperature and thus the
tyre pressure changes by approximately
10 kPa (0.1 bar/1.5 psi) per 10 †. Take this
into account when checking the pressure of
warm tyres. Only correct the tyre pressure if it
is too low for the current operating condi-
tions.
Driving with tyre pressure that is too high or
too low can:
R shorten the service life of the tyres
R cause increased tyre damage
R have a negative effect on handling charac-
teristics and thus driving safety (e.g. aqua-
planing)
The tyre pressure values given for low loads
are minimum values which offer you good ride
comfort characteristics.
However, you can also use the values given
for higher loads. These are permissible and
will not adversely affect the running of the
vehicle. For Saloons at speeds of up to 210 km/h
(does not apply to AMG vehicles, AMG
Sport models): despite what is stated on the
tyre pressure information label (fuel filler
flap), at speeds of up to 210 km/h the values stated can be reduced as follows, without a
reduction in safety:
R Saloons (except Eco models): Ò30 kPa
(Ò0.3 bar/ Ò4 psi)
R Saloons (Eco models with 16 or 17 in
tyres on both axles): Ò60 kPa (Ò0.6 bar/
Ò9 psi)
This does not apply to vehicles towing a
trailer.
This improves the ride comfort of your vehi-
cle; however, fuel consumption may increase slightly. Tyre pressure monitor
General notes If a tyre pressure monitor system is fitted, the
vehicle's wheels have sensors fitted that
monitor the tyre pressures in all four tyres.
The tyre pressure monitor warns you if the
pressure drops in one or more of the tyres.
The tyre pressure monitor only functions if
the corresponding sensors are fitted to all
wheels.
Information on tyre pressures is shown in the multifunction display. After a few minutes of
driving, the current tyre pressure of each tyre
is shown in the Service Servicemenu of the multi-
function display, see illustration (example). Tyre pressure
433Wheels and tyres Z