fuel consumption Lexus GS430 2006 Scheduled Maintenance Guide / LEXUS 2006 GS430/GS300 FROM JAN. 2005 PROD. OWNER'S MANUAL (OM30649U)

GAUGES, METERS AND SERVICE REMINDER INDICATORS
82
MULTIINFORMATION DISPLAY
G13037
The multiinformation display provides various
information, including your vehicle’s driving condition,
outside temperature, and warning messages if your
vehicle is in trouble.
During ordinary driving, cruise information or graphic
information is displayed. However, if any problem occurs
in your vehicle, the display changes to a warning message
screen.
(a) Cruise information
The following information is shown with the engine switch
in “IGON” mode. Each time you push the “DISP” switch,
the displayed information is changed.
 Outside temperature
 Available driving distance
 Average fuel consumption after being refueled
 Current fuel consumption
 Blank
The displayed cruise information values indicate the general
driving condition and may not always reflect precise and actual
conditions.
 Outside temperature
g13047
The outside temperature is displayed. For details, see
“Outside temperature display” on page 106.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
83
Available driving distance
g13039
The available driving distance is calculated and displayed
depending on the amount of remaining fuel.
Average fuel consumption after refueling
g13046
The average fuel consumption after refueling is
calculated and displayed based on the total driving
distance and the total fuel consumption after refueling.
The value is updated every 10 seconds.
When refueling, be sure to stop your vehicle and turn the
engine switch off.
The average fuel consumption could not be calculated in either
of the following cases:
 Refueled by opening the fuel filler door using the manual
lever in the trunk
 Refueled with a small quantity of gasoline
Current fuel consumption
g13040
The current fuel consumption is calculated and displayed
based on the driving distance and the fuel consumption
at 20 revolutions of the engine.
The value is updated every 0.5 seconds.
If you are driving at low speeds just before stopping, the
accurate figure may not be shown.

TOUCH SCREEN
218
INFORMATION MENU
G18044
Vehicles with Navigation system*
G18045
Vehicles without Navigation system
*For other functions such as Maintenance and Calender, see
“Navigation System Owner’s Manual”. For “Lexus park Assist”, see “Setting the park assist system”\
on page 385. For “Adjust clock”, see “Clock” on page 103.
Trip information
Trip information such as driving time, driving distance,
average vehicle speed, fuel consumption, etc. can be
displayed on the screen.
1. Push the
“INFO” button to display the Information
Menu screen.
G18045
2. Touch the “Trip Info.” switch.

TOUCH SCREEN
219
G18003
Consumption
The consumption is calculated and displayed based on
the driving distance and the fuel consumption for 2
seconds with engine running.
The value is updated every 0.5 seconds.
If you are driving at low speeds just before stopping, the
accurate figure may not be shown.
After Refueling
The consumption after refueling is calculated and
displayed based on the total driving distance and the total
fuel consumption after refueling.
The value is updated every 10 seconds.
When refueling, be sure to stop your vehicle and turn the
engine switch off. Cruising Range
How far you can drive with the remaining fuel is
displayed.
Even though the display indicates sufficient miles to run, if the
fuel level on the fuel gauge approaches “E” or the low fuel level
warning light comes on, fill the fuel tank as soon as possible.
INFORMATION
 When you first start driving your new vehicle, the
correct cruising range may not be shown. One or
more refills of 10 gallons or more may be required for
the system to set its calibration.
 The cruising range displayed is calculated based on
past fuel consumption and may vary according to
your driving style and road condition.

DRIVING TIPS
454
TRAILER TOWING
G32002
Lexus does not recommend towing a trailer with your
vehicle. It is not designed for trailer towing.
HOW TO SAVE FUEL AND MAKEYOUR VEHICLE LAST LONGER
Improving fuel economy is easy − just take it easy. It will help
make your vehicle last longer, too. Here are some specific tips
on how to save money on both fuel and repairs:
 Keep your tires inflated at the correct pressure. Check
the inflation pressure every two weeks, or at least once a
month. Underinflation causes tire wear and wastes fuel.
 Do not carry unneeded weight in your vehicle. Excess
weight puts a heavier load on the engine, causing greater
fuel consumption.
 Avoid lengthy warmup idling. Once the engine is
running smoothly, begin driving − but gently. Remember,
however, that on cold winter days this may take a little
longer.
 Always keep the automatic transmission selector lever
in the “D” position when engine braking is not required.
Driving with the overdrive off will reduce the fuel economy.
(For details, see “Automatic transmission” on page 353.)
 Accelerate slowly and smoothly. Avoid jackrabbit starts.
 Avoid long engine idling. If you have a long wait and you
are not in traffic, it is better to turn off the engine and start
again later.
 Avoid engine overrevving. Use a gear position suitable
for the road on which you are traveling.

DRIVING TIPS
455

Avoid continuous speeding up and slowing down.
Stop−and−go driving wastes fuel.
 Avoid unnecessary stopping and braking. Maintain a
steady pace. Try to time the traf fic signals so you only need
to stop as little as possible or take advantage of through
streets to avoid traffic lights. Keep a proper distance from
other vehicles to avoid sudden braking. This will also
reduce wear on your brakes.
 Avoid heavy traffic or traffic jams whenever possible.
 Do not rest your foot on the brake pedal. This causes
premature wear, overheating and poor fuel economy.
 Maintain a moderate speed on highways. The faster you
drive, the greater the fuel consumption. By reducing your
speed, you will cut down on fuel consumption.
 Keep the front wheels in proper alignment. Avoid hitting
the curb and slow down on rough roads. Improper
alignment not only causes faster tire wear but also puts an
extra load on the engine, which, in turn, wastes fuel.
 Keep the bottom of your vehicle free from mud, etc.
This not only lessens weight but also helps prevent
corrosion. 
Keep your vehicle tunedup and in top shape. A dirty air
cleaner, improper valve clearance, dirty plugs, dirty oil and
grease, brakes not adjusted, etc. all lower engine
performance and contribute to poor fuel economy. For
longer life of all parts and lower operating costs, keep all
maintenance work on schedule, and if you often drive under
severe conditions, see that your vehicle receives more
frequent maintenance (For scheduled maintenance
information, please refer to the “Owner’s Manual
Supplement / Scheduled Maintenance”.)
CAUTION
Never turn off the engine to coast down hills. Your
power steering and brake booster will not function
without the engine running. Also, the emission control
system operates properly only when the engine is
running.

SECTION 6 – 2
511
SERVICE PROCEDURES AND
SPECIFICATIONS
Engine
Specifications (GS430)512
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications (GS300) 515
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel 518
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . . . . . . . . . . . .
Fuel pump shut off system 520
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Facts about engine oil consumption 520
. . . . . . . . . . . . . . . . . . . . . . . .
Used engine oil 522
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . .
Checking the engine oil level 522
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the engine coolant level 527
. . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the radiator and condenser 529
. . . . . . . . . . . . . . . . . . . . . . .
Spark plugs 529
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . .

ENGINE
520
FUEL PUMP SHUT OFF SYSTEM
The fuel pump shut off system stops supplying fuel to the
engine to minimize the risk of fuel leakage when the engine
stalls or an airbag inflates upon collision. To restart the engine
after the fuel pump shut off system activates, turn the engine
switch off once and start it.
CAUTION
Inspect the ground under the vehicle before restarting
the engine. If you find that liquid has leaked onto the
ground, it is the fuel system that has been damaged and
it is in need of repair. In this case, do not restart the
engine.
FACTS ABOUT ENGINE OILCONSUMPTION
Functions of engine oil
Engine oil has the primary function of lubricating and cooling
the inside of the engine, and plays a major role in maintaining
the engine in proper working order.
Engine oil consumption
It is normal that an engine should consume some engine
oil during normal engine operation. The causes of oil
consumption in a normal engine are as follows.
Oil is used to lubricate pistons, piston rings and cylinders.
A thin film of oil is left on the cylinder wall when a piston
moves downwards in the cylinder. High negative pressure
generated when the vehicle is decelerating sucks some of
this oil into the combustion chamber. This oil as well as
some part of the oil film left on the cylinder wall is burned by
the high temperature combustion gases during the
combustion process.
 Oil is also used to lubricate the stems of the intake valves.
Some of this oil is sucked into the combustion chamber
together with the intake air and is burned along with the fuel.
High temperature exhaust gases also burn the oil used to
lubricate the exhaust valve stems.

ENGINE
521
The amount of engine oil consumed depends on the
viscosity of the oil, the quality of the oil and the way the
vehicle is driven.
More oil is consumed under driving conditions such as high
speeds and frequent acceleration and deceleration.
A new engine consumes more oil, since its pistons, piston rings
and cylinder walls have not become conditioned.
Oil consumption: Max. 1.0 L per 1000 km (1.1 qt./600 miles,
0.9 lmp·qt./600 miles).
When judging the amount of oil consumption, keep in
mind that the oil may have become diluted, making it
difficult to judge the true level accurately.
For example, if a vehicle is used for repeated short trips and
consumes a normal amount of oil, the dipstick may not show
any drop in the oil level at all, even after 1000 km (600 miles)
or more. This is because
the oil is gradually becoming diluted
with fuel or moisture, making it appear that the oil level has not
changed.
The diluting ingredients evaporate out when the vehicle is then
driven at high speeds, as on an expressway, making it appear
that oil is excessively consumed after driving at high speeds.
Importance of engine oil level check
One of the most important points in proper vehicle
maintenance is to keep the engine oil at the optimum level so
that oil function will not be impaired. Therefore, it is essential
that the oil level be checked regularly. Lexus recommends that
the oil level be checked every time you refuel the vehicle.
NOTICE
Failure to check the oil level regularly could lead to
serious engine trouble due to insufficient oil.
For detailed information on oil level check, see ”Checking the
engine oil level” on page 522.