Toyota Prius Prime (2020 year). Owner's manual - part 46

728

9-1. Specifications

■

Recommendation of the use of low emissions gasoline
Gasolines  containing  oxygenates  such  as  ethers  and  ethanol,  as  well  as
reformulated gasolines, are available in some cities. These fuels are typically
acceptable for use, providing they meet other fuel requirements.
Toyota  recommends  these  fuels,  since  the  formulations  allow  for  reduced
vehicle emissions.

■

Non-recommendation of the use of blended gasoline

●

If you use gasohol in your vehicle, be sure that it has an octane rating no
lower than 87.

●

Toyota does not recommend the use of gasoline containing methanol.

■

Non-recommendation of the use of gasoline containing MMT
Some  gasoline  contains  an  octane  enhancing  additive  called  MMT
(Methylcyclopentadienyl 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.

■

If your engine knocks

●

Consult your Toyota dealer.

●

You may occasionally notice light knocking for a short time while accelerat-
ing or driving uphill. This is normal and there is no need for concern.

●

Use only gasoline containing up to 15%
ethanol.
DO  NOT  use  any  flex-fuel  or  gasoline
that could contain more than 15% etha-
nol,  including  from  any  pump  labeled
E30,  E50,  E85  (which  are  only  some
examples  of  fuel  containing  more  than
15% ethanol).

DO NOT use gasoline 
containing more than 
15% ethanol.

(30% ethanol)

(50% ethanol)

(85% ethanol)

729

9-1. Specifications

9

Vehi

cl

e specificatio

ns

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 the type previously stated.
Other  gasohol  may  cause  fuel  system  damage  or  vehicle  performance
problems.

●

Using unleaded gasoline with an octane number or rating lower than the
level previously stated will cause persistent heavy knocking.
At worst, this will lead to engine damage.

■

Fuel-related poor driveability
If poor driveability (poor hot starting, vaporization, engine knocking, etc.) is
encountered after using a different type of fuel, discontinue the use of that
type of fuel.

■

When refueling with gasohol
Take care not to spill gasohol. It can damage your vehicle’s paint.

■

Notice about fuel
P. 104

730

9-1. Specifications

Tire information

Tire size

(

P. 731)

DOT and Tire Identification Number (TIN)

(

P. 731)

Location of treadwear indicators 

(

P. 602)

Tire ply composition and materials

Plies are layers of rubber-coated parallel cords. Cords are the strands

which form the plies in a tire.

Summer tires or all season tires

 (

P. 606)

An all season tire has “M+S” on the sidewall. A tire not marked “M+S”

is a summer tire.

Radial tires or bias-ply tires

A radial tire has “RADIAL” on the sidewall. A tire not marked “RADIAL”

is a bias-ply tire.

TUBELESS or TUBE TYPE

A tubeless tire does not have a tube and air is directly put into the tire.

A tube type tire has a tube inside the tire and the tube maintains the air

pressure.

Load limit at maximum cold tire inflation pressure 

(

P. 605)

Maximum cold tire inflation pressure 

(

P. 725)

This means the pressure to which a tire may be inflated.

Uniform tire quality grading

For details, see “Uniform Tire Quality Grading” that follows.

Typical tire symbols

1
2
3
4

5

6

7

8
9

10

731

9-1. Specifications

9

Vehi

cl

e specificatio

ns

DOT symbol

*

Tire Identification Number (TIN)
Tire manufacturer’s identification mark
Tire size code
Manufacturer’s optional tire type code (3 or 4 letters)
Manufacturing week
Manufacturing year
Manufacturer’s code

*

: The DOT symbol certifies that the tire conforms to applicable Federal

Motor Vehicle Safety Standards.

■

Typical tire size information
The illustration indicates typical
tire size.

Tire use
(P = Passenger car, 
T = Temporary use)
Section width (millimeters)
Aspect ratio
(tire height to section width)
Tire construction code (R = Radial, D = Diagonal)
Wheel diameter (inches)
Load index (2 digits or 3 digits)
Speed symbol (alphabet with one letter)

Typical DOT and Tire Identification Number (TIN)



Type A



Type B

Tire size

1
2
3
4
5
6
7
8

1

2
3

4
5
6
7

732

9-1. Specifications

■

Tire dimensions

Section width
Tire height
Wheel diameter

Bead
Sidewall
Shoulder
Tread
Belt
Inner liner
Reinforcing rubber
Carcass
Rim lines
Bead wires
Chafer

1
2
3

Tire section names

1
2
3
4
5
6
7
8
9

10
11

733

9-1. Specifications

9

Vehi

cl

e specificatio

ns

This  information  has  been  prepared  in  accordance  with  regulations
issued  by  the  National  Highway  Traffic  Safety Administration  of  the
U.S. Department of Transportation.
It  provides  the  purchasers  and/or  prospective  purchasers  of  Toyota
vehicles with information on uniform tire quality grading.

Your Toyota  dealer  will  help  answer  any  questions  you  may  have  as

you read this information.

■

DOT quality grades
All passenger vehicle tires must conform to Federal Safety Require-
ments  in  addition  to  these  grades.  Quality  grades  can  be  found
where applicable on the tire sidewall between tread shoulder and
maximum section width.

For example: Treadwear 200 Traction AA Temperature A

■

Treadwear
The  treadwear  grade  is  a  comparative  rating  based  on  the  wear
rate of the tire when tested under controlled conditions on a speci-
fied government test course.

For example, a tire graded 150 would wear one and a half (1 - 1/2)

times as well on the government course as a tire graded 100.

The  relative  performance  of  tires  depends  upon  the  actual  condi-

tions of their use. Performance may differ significantly from the norm

due to variations in driving habits, service practices and differences

in road characteristics and climate.

■

Traction AA, A, B, C
The  traction  grades,  from  highest  to  lowest,  are AA, A,  B  and  C,
and  they  represent  the  tire’s  ability  to  stop  on  wet  pavement  as
measured under controlled conditions on specified government test
surfaces of asphalt and concrete.

A tire marked C may have poor traction performance.
Warning: The traction grade assigned to this tire is based on braking

(straight ahead) traction tests and does not include cornering (turn-

ing) traction.

Uniform Tire Quality Grading

734

9-1. Specifications

■

Temperature A, B, C
The temperature grades are A (the highest), B, and C, representing
the tire’s resistance to the generation of heat and its ability to dissi-
pate  heat  when  tested  under  controlled  conditions  on  a  specified
indoor laboratory test wheel.

Sustained  high  temperature  can  cause  the  material  of  the  tire  to

degenerate and reduce tire life, and excessive temperature can lead

to sudden tire failure.
Grade C corresponds to a level of performance which all passenger

car  tires  must  meet  under  the  Federal  Motor  Vehicle  Safety  Stan-

dard No. 109.
Grades B and A represent higher levels of performance on the labo-

ratory test wheel than the minimum required by law.
Warning: The temperature grades of a tire assume that it is properly

inflated and not overloaded.

Excessive speed, underinflation, or excessive loading, either sepa-

rately  or  in  combination,  can  cause  heat  buildup  and  possible  tire

failure.

735

9-1. Specifications

9

Vehi

cl

e specificatio

ns

Glossary of tire terminology

Tire related term

Meaning

Cold tire inflation 

pressure

Tire  pressure  when  the  vehicle  has  been

parked  for  three  hours  or  more,  or  has  not

been driven more than 1 mile or 1.5 km under

that condition

Maximum inflation 

pressure

The maximum cold inflated pressure to which

a tire may be inflated, shown on the sidewall

of the tire

Recommended 

inflation pressure

Cold tire inflation pressure recommended by a

manufacturer

Accessory weight

The combined weight (in excess of those stan-

dard  items  which  may  be  replaced)  of  hybrid

transmission,  power  steering,  power  brakes,

power  windows,  power  seats,  radio  and

heater, to the extent that these items are avail-

able  as  factory-installed  equipment  (whether

installed or not)

Curb weight

The  weight  of  a  motor  vehicle  with  standard

equipment, including the maximum capacity of

fuel,  oil  and  coolant,  and  if  so  equipped,  air

conditioning  and  additional  weight  optional

engine

Maximum loaded 

vehicle weight

The sum of:

(a) Curb weight

(b) Accessory weight

(c) Vehicle capacity weight

(d) Production options weight

Normal occupant 

weight

150 lb. (68 kg) times the number of occupants

specified  in  the  second  column  of  Table  1

*

that follows

Occupant distribution

Distribution of occupants in a vehicle as speci-

fied in the third column of Table 1

*

 below

736

9-1. Specifications

Production options 

weight

The combined weight of installed regular pro-

duction options weighing over 5 lb. (2.3 kg) in

excess  of  the  standard  items  which  they

replace,  not  previously  considered  in  curb

weight  or  accessory  weight,  including  heavy

duty  brakes,  ride  levelers,  roof  rack,  heavy

duty 12-volt battery, and special trim

Rim

A  metal  support  for  a  tire  or  a  tire  and  tube

assembly  upon  which  the  tire  beads  are

seated

Rim diameter

(Wheel diameter)

Nominal diameter of the bead seat

Rim size designation

Rim diameter and width

Rim type designation

The industry manufacturer’s designation for a

rim by style or code

Rim width

Nominal distance between rim flanges

Vehicle capacity 

weight 

(Total load capacity)

The rated cargo and luggage load plus 150 lb.

(68 kg) times the vehicle’s designated seating

capacity

Vehicle maximum load

on the tire

The  load  on  an  individual  tire  that  is  deter-

mined by distributing to each axle its share of

the  maximum  loaded  vehicle  weight,  and

dividing by two

Vehicle normal load on

the tire

The  load  on  an  individual  tire  that  is  deter-

mined by distributing to each axle its share of

curb  weight,  accessory  weight,  and  normal

occupant  weight  (distributed  in  accordance

with Table 1

*

 below), and dividing by two

Weather side

The surface area of the rim not covered by the

inflated tire

Bead

The part of the tire that is made of steel wires,

wrapped or reinforced by ply cords and that is

shaped to fit the rim

Tire related term

Meaning

737

9-1. Specifications

9

Vehi

cl

e specificatio

ns

Bead separation

A  breakdown  of  the  bond  between  compo-

nents in the bead

Bias ply tire

A  pneumatic  tire  in  which  the  ply  cords  that

extend  to  the  beads  are  laid  at  alternate

angles  substantially  less  than  90  degrees  to

the centerline of the tread

Carcass

The  tire  structure,  except  tread  and  sidewall

rubber which, when inflated, bears the load

Chunking

The  breaking  away  of  pieces  of  the  tread  or

sidewall

Cord

The strands forming the plies in the tire

Cord separation

The  parting  of  cords  from  adjacent  rubber

compounds

Cracking

Any parting within the tread, sidewall, or inner-

liner of the tire extending to cord material

CT

A  pneumatic  tire  with  an  inverted  flange  tire

and  rim  system  in  which  the  rim  is  designed

with  rim  flanges  pointed  radially  inward  and

the  tire  is  designed  to  fit  on  the  underside  of

the  rim  in  a  manner  that  encloses  the  rim

flanges inside the air cavity of the tire

Extra load tire

A tire designed to operate at higher loads and

at  higher  inflation  pressures  than  the  corre-

sponding standard tire

Groove

The space between two adjacent tread ribs

Innerliner

The  layer(s)  forming  the  inside  surface  of  a

tubeless tire that contains the inflating medium

within the tire

Innerliner separation

The parting of the innerliner from cord material

in the carcass

Tire related term

Meaning

738

9-1. Specifications

Intended outboard 

sidewall

(a) The  sidewall  that  contains  a  whitewall,

bears  white  lettering,  or  bears  manufac-

turer,  brand,  and/or  model  name  molding

that  is  higher  or  deeper  than  the  same

molding on the other sidewall of the tire, or

(b) The  outward  facing  sidewall  of  an  asym-

metrical tire that has a particular side that

must  always  face  outward  when  mounted

on a vehicle

Light truck (LT) tire

A  tire  designated  by  its  manufacturer  as  pri-

marily  intended  for  use  on  lightweight  trucks

or multipurpose passenger vehicles

Load rating

The maximum load that a tire is rated to carry

for a given inflation pressure

Maximum load rating

The load rating for a tire at the maximum per-

missible inflation pressure for that tire

Maximum permissible 

inflation pressure

The maximum cold inflation pressure to which

a tire may be inflated

Measuring rim

The  rim  on  which  a  tire  is  fitted  for  physical

dimension requirements

Open splice

Any parting at any junction of tread, sidewall,

or innerliner that extends to cord material

Outer diameter

The overall diameter of an inflated new tire

Overall width

The  linear  distance  between  the  exteriors  of

the sidewalls of an inflated tire, including ele-

vations due to labeling, decorations, or protec-

tive bands or ribs

Passenger car tire

A  tire  intended  for  use  on  passenger  cars,

multipurpose passenger vehicles, and trucks,

that  have  a  gross  vehicle  weight  rating

(GVWR) of 10,000 lb. or less.

Ply

A layer of rubber-coated parallel cords

Ply separation

A  parting  of  rubber  compound  between  adja-

cent plies

Tire related term

Meaning

739

9-1. Specifications

9

Vehi

cl

e specificatio

ns

Pneumatic tire

A  mechanical  device  made  of  rubber,  chemi-

cals, fabric and steel or other materials, that,

when  mounted  on  an  automotive  wheel,  pro-

vides the traction and contains the gas or fluid

that sustains the load

Radial ply tire

A  pneumatic  tire  in  which  the  ply  cords  that

extend to the beads are laid at substantially 90

degrees to the centerline of the tread

Reinforced tire 

A tire designed to operate at higher loads and

at  higher  inflation  pressures  than  the  corre-

sponding standard tire

Section width

The  linear  distance  between  the  exteriors  of

the sidewalls of an inflated tire, excluding ele-

vations due to labeling, decoration, or protec-

tive bands

Sidewall

That  portion  of  a  tire  between  the  tread  and

bead

Sidewall separation

The parting of the rubber compound from the

cord material in the sidewall

Snow tire

A tire that attains a traction index equal to or

greater  than  110,  compared  to  the ASTM  E-

1136  Standard  Reference  Test  Tire,  when

using  the  snow  traction  test  as  described  in

ASTM  F-1805-00,  Standard  Test  Method  for

Single  Wheel  Driving  Traction  in  a  Straight

Line on Snow-and Ice-Covered Surfaces, and
which is marked with an Alpine Symbol (

)

on at least one sidewall

Test rim

The rim on which a tire is fitted for testing, and

may  be  any  rim  listed  as  appropriate  for  use

with that tire

Tread

That  portion  of  a  tire  that  comes  into  contact

with the road

Tread rib

A  tread  section  running  circumferentially

around a tire

Tire related term

Meaning

740

9-1. Specifications

*

: Table 1 

 Occupant loading and distribution for vehicle normal load for

various designated seating capacities

Tread separation

Pulling away of the tread from the tire carcass

Treadwear indicators 

(TWI)

The  projections  within  the  principal  grooves

designed  to  give  a  visual  indication  of  the

degrees of wear of the tread

Wheel-holding fixture

The  fixture  used  to  hold  the  wheel  and  tire

assembly securely during testing

Tire related term

Meaning

Designated seating 

capacity, Number of 

occupants

Vehicle normal load, 

Number of occupants

Occupant distribution 

in a normally loaded 

vehicle

2 through 4

2

2 in front

5 through 10

3

2 in front, 1 in second 

seat

11 through 15

5

2 in front, 1 in second 

seat, 1 in third seat, 1 

in fourth seat

16 through 20

7

2 in front, 2 in second 

seat, 2 in third seat, 1 

in fourth seat

741

9-2. Customization

9

Vehi

cl

e specificatio

ns

Customizable features

When customizing vehicle features, ensure that the vehicle is parked
in a safe place with the parking brake set and the shift position in P.

■

Changing using the multi-information display

Press 

 or 

 of the meter control switches, select 

.

Press 

 or 

 of the meter control switches, select 

(“Vehicle Settings”), and then press 

.

Press 

 or 

 of the meter control switches, select the item,

and then press 

.

Press 

 or 

 of the meter control switches, select the desired

setting, and then press 

.

To  go  back  to  the  previous  screen  or  exit  the  customize  mode,

press 

.

Your vehicle includes a variety of electronic features that can be
personalized to suit your preferences. The settings of these fea-
tures  can  be  changed  using  the  multi-information  display,  the
navigation  system,  the  multimedia  system,  or  at  your  Toyota
dealer.

Some function settings are changed simultaneously with other func-
tions  being  customized.  Contact  your  Toyota  dealer  for  further
details.

Customizing vehicle features

1

2

3

4

742

9-2. Customization

■

Changing using the navigation system or the multimedia sys-
tem



Vehicles with the navigation system
Press the “MENU” button on the navigation system.
Select “Settings”.
Select “Vehicle” on the “Setup” screen and select “Vehicle Cus-
tomization”.

Various settings can be changed. Refer to the list of settings that
can be changed for details.



Vehicles with the multimedia system
Press the “MENU” button on the multimedia system.
Select “Setup”.
Select “Vehicle” on the “Setup” screen and select “Vehicle Cus-
tomization”.

Various settings can be changed. Refer to the list of settings that
can be changed for details.

1

2

3

1

2

3

743

9-2. Customization

9

Vehi

cl

e specificatio

ns

Settings that can be changed using the multi-information display
Settings  that  can  be  changed  using  the  navigation  system  or  the
multimedia system
Settings that can be changed by your Toyota dealer

Definition of symbols: O = Available, – = Not available

■

Hybrid system (

P. 93)

■

Instrument cluster (

P. 192)

Customizable features

1
2

3

Function

Default 

setting

Customized 

setting

Vehicle  proximity  notification
system (volume of sound)

Level 1

Level 2

–

–

O

Level 3

1

2

3

Function

Default 

setting

Customized 

setting

Sensor  sensitivity  for  darken-
ing  the  brightness  of  the
instrument  cluster  depending
on the outside brightness

Standard

-2 to 2

–

–

O

Sensor sensitivity for returning
the  brightness  of  the  instru-
ment  cluster  to  the  original
level depending on the outside
brightness

Standard

-2 to 2

–

–

O

1

2

3