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

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9-1. Specifications

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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)

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9-1. Specifications

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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

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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

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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

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9-1. Specifications

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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

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9-1. Specifications

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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

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9-1. Specifications

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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.

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9-1. Specifications

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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

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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

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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

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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

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9-1. Specifications

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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

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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

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9-2. Customization

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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

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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

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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