2010 TOYOTA PRIUS octane

105
1-6. Refueling
1
Before driving
PRIUS_U (OM47668U) U.S.A.
Closing the fuel tank cap
After refueling, turn the fuel tank
cap clockwise until you hear a
click. The cap will revolve slightly
in the opposite direction once
released.
■ Fuel types
Use unleaded gasoline. (Octane Rating 87 [Research Octane Number 91] or
higher)
■ Fuel tank capacity
Approximately 11.9 gal. (45 L, 9.9 Imp. gal.)

558 6-1. Specifications
PRIUS_U (OM47668U) U.S.A.■
Engine number and electric mo tor (traction motor) number
The gasoline engine number and
electric motor (traction motor)
number are stamped as shown.
Gasoline engine number
Electric motor (traction motor)
number
Engine
Fuel
Model2ZR-FXE
Type 4-cylinder in line, 4-cycle, gasoline
Bore and stroke 3.17  3.48 in. (80.5  88.3 mm)
Displacement109.7 cu. in. (1798 cm3)
Valve clearance
(engine cold) Automatic adjustment
Fuel typeUnleaded gasoline only
Octane Rating
87 (Research Octane Number 91) or higher
Fuel tank capacity 11.9 gal. (45 L, 9.9 Imp.gal.)

568
6-1. Specifications
PRIUS_U (OM47668U) U.S.A.
Fuel infor mation
■Fuel tank opening fo r unleaded gasoline
To help prevent incorrect fueling, your Toyota has a fuel tank opening that
only accommodates the special nozzle on unleaded fuel pumps.
■ If your engine knocks
● Consult your Toyota dealer.
● You may occasionally notice light knocking for a short time while acceler-
ating or driving uphill. This is normal and there is no need for concern.
■ Gasoline quality
In very few cases, driveability problems may be caused by the brand of gas-
oline you are using. If driveability problems persist, try changing the brand of
gasoline. If this does not correct the problem, consult your Toyota dealer.
Your vehicle must use only unleaded gasoline. 
Select octane rating 87 (Research Octane Number 91) or higher. Use
of unleaded gasoline with an octane rating lower than 87 may result
in engine knocking. Persistent kno cking can lead to engine damage.
At minimum, the gasoline you use should meet the specifications
of ASTM D4814 in the U.S.A. and CGSB3.5-M93 in Canada.

570 6-1. Specifications
PRIUS_U (OM47668U) U.S.A.
■Toyota does not recomm end blended gasoline
● Toyota allows the use of oxygenate blended gasoline where the oxygen-
ate content is up to 10 % ethanol or 15 % MTBE.
● If you use gasohol in your Toyota, be sure that it has an octane rating no
lower than 87.
● Toyota DOES NOT recommend the use of gasoline containing methanol.
■ Toyota does not recommend gasoline containing MMT
Some gasoline contains octane enhancing additive called MMT (Methylcy
clopentadienyl Manganese Tricarbonyl).
Toyota DOES NOT recommend the use of gasoline that contains MMT. If
fuel containing MMT is used, your emission control system may be
adversely affected.
The malfunction indicator lamp on the instrument cluster may come on. If
this happens, contact your Toyota dealer for service.

571
6-1. Specifications
6
Vehicle specifications
PRIUS_U (OM47668U) U.S.A.
NOTICE
■
Notice on fuel quality
● Do not use improper fuels. If improper fuels are used, the engine will be
damaged.
● Do not use leaded gasoline. 
Leaded gasoline can cause damage to your vehicle’s three-way catalytic
converters causing the emission control system to malfunction.
● Do not use gasohol other than that stated here. 
Other gasohol may cause fuel system damage or vehicle performance
problems.
● Using unleaded gasoline with an octane number or rating lower than that
stated here will cause persistent heavy knocking. 
At worst, this will lead to engine damage.
■ Fuel-related poor driveability
If after using a different type of fuel, poor driveability is encountered (poor
hot starting, vaporization, engine knocking, etc.), discontinue the use of that
type of fuel.
■ When refueling with gasohole
Take care not to spill gasohol. It can damage your vehicle’s paint.