[2025 Latest] Top 20 Fuel-Efficient Cars! A Thorough Comparison from Hybrid Cars to Kei Cars

This time, we’ll be researching and ranking the most fuel-efficient passenger cars on sale in Japan as of 2025. As gasoline prices continue to rise, fuel efficiency is becoming an increasingly important factor when choosing a car. Coupled with growing environmental awareness, fuel-efficient, economical cars are attractive to many people.

With gasoline prices continuing to rise, fuel economy is one of the most important factors when choosing a car. In this article, we’ll introduce the top 20 most fuel-efficient cars on the market as of 2025, ranked based on actual fuel economy data and WLTC test cycle fuel economy. From hybrids to minicars, find the fuel-efficient car that best suits your needs.

Basic knowledge of fuel economy: Difference between WLTC mode and actual fuel economy

What is WLTC mode fuel economy?

WLTC mode fuel economy is an international fuel economy measurement method that was introduced in October 2018. It consists of three modes – “urban,” “suburban,” and “highway” – with an average distribution of driving, and is measured under conditions closer to actual driving than the conventional JC08 mode fuel economy.

Difference from actual fuel consumption

Actual fuel economy refers to fuel economy under actual driving conditions. It is common for actual fuel economy to be 20-30% lower than the WLTC mode fuel economy due to factors such as air conditioning use, traffic congestion, and driving style.

Differences between WLTC mode and JC08 mode fuel economy

Test vehicle weight

In the JC08 mode, a uniform 110 kg is added to the vehicle weight to account for the driver and other factors. In the WLTC mode, in addition to the 100 kg assumed for the driver, a portion of the weight that can be carried other than the driver is added. Calculations are based on 15% for passenger cars and 28% for small freight vehicles. The weight of passengers and cargo other than the driver is taken into account.

Increased percentage of time spent running with cold starts

Fuel efficiency varies greatly depending on whether the engine is cold or warm. In the JC08 mode, the ratio was 25% for cold starts and 75% for warm starts, but in the WLTC mode, the measurement was changed to 100% cold starts. This is stricter and closer to realistic fuel efficiency.

Reduced idling time ratio

Idling time has been reduced from 29.7% in the JC08 mode to 15.4% in the WLTC mode, taking into account the increasing popularity of hybrid vehicles and idling stop devices.

WLTC mode measurement in 4 types

 In addition to WLTC mode fuel economy, it is now mandatory to display fuel economy for each driving environment, such as “urban,” “suburban,” and “highway,” in catalogs, etc.

Change average speed and maximum speed

The average speed increases from 24.41 km/h in JC08 mode to 36.57 km/h in WLTC mode, and the top speed increases from 81.6 km/h in JC08 mode to 97.7 km/h in WLTC mode.

The benefits of choosing fuel-efficient domestic cars

Choosing a fuel-efficient vehicle is not only economically beneficial, but also environmentally friendly.

Fuel efficiency ranking criteria

This ranking is based on the “WLTC mode fuel economy” established by the Ministry of Land, Infrastructure, Transport and Tourism. WLTC mode fuel economy is measured under conditions that are closer to real-world driving, such as in urban areas, suburban areas, and on highways.

Why adopt the WLTC mode?

Many people may be wondering what the difference is between this and the “JC08 mode fuel economy” that has been used until now. In addition to the “WLTC mode” fuel economy, an internationally unified fuel economy test method that will be mandatory for new vehicles from October 2018, it will also be mandatory to display fuel economy figures for each driving environment, such as “urban,” “suburban,” and “highway,” in catalogs, etc.

While automobile fuel economy has improved in recent years, it has been pointed out that actual fuel economy is up to 40% lower than that shown in catalogs, etc. This discrepancy is caused by differences in driving environment and driving methods, etc.

Therefore, in order to enable car users to understand fuel economy closer to actual driving conditions depending on their individual usage conditions, it will be made mandatory to  display fuel economy for each driving environment, such as “urban,” “suburban,” and “highway,” in catalogs, etc., in addition to the WLTC mode fuel economy that will be mandatory for new cars from October 2018. This will enable customers to know which cars have good energy-saving performance according to their driving environment.

[2025 Latest] Top 20 Fuel-Efficient Cars

Based on actual fuel consumption data and the latest WLTC mode fuel consumption, we will introduce the top 20 most fuel-efficient cars currently on sale in 2025.

Fuel-efficient car rankings

Ranking	Manufacturer	Car name	grade	WLTC mode fuel economy	Actual fuel consumption estimate	Body Type
1st place	Toyota	Yaris	Hybrid X 2WD	36.0km/L	31.4km/L	compact
2nd place	Toyota	Aqua	X 2WD	34.6km/L	26.0km/L	compact
3rd place	Toyota	Prius	U 2WD	32.6km/L	24.5km/L	sedan
4th place	Toyota	Yaris Cross	Hybrid X 2WD	30.8km/L	23.8km/L	SUV
5th place	Toyota	Corolla	Hybrid G ​​2WD	30.2km/L	23.6km/L	sedan
5th place	Honda	fit	e:HEV Basic 2WD	30.2km/L	23.5km/L	compact
7th place	Toyota	Corolla Sport	Hybrid G”X” 2WD	30.0km/L	23.2km/L	hatchback
8th place	Toyota	Corolla Touring	Hybrid X 2WD	29.5km/L	22.8km/L	wagon
9th place	Toyota	Sienta	Hybrid X 2WD	28.8km/L	22.5km/L	minivan
10th place	Nissan	Notes	X 2WD	28.4km/L	22.2km/L	compact
11th place	Suzuki	Alto	Hybrid X 2WD	27.7km/L	25.8km/L	Light vehicle
12th place	Toyota	Rise	Hybrid X 2WD	28.0km/L	24.1km/L	SUV
13th place	Daihatsu	Rocky	Hybrid X 2WD	28.0km/L	27.0km/L	SUV
14th place	Lexus	LBX	AWD	27.7km/L	21.5km/L	SUV
15th place	Suzuki	Alto Lapin	2WD all cars	26.2km/L	24.1km/L	Light vehicle
16th place	Lexus	UX	UX250h 2WD	26.3km/L	20.8km/L	SUV
17th place	Honda	Vezel	e:HEV X 2WD	26.0km/L	20.5km/L	SUV
18th place	Suzuki	Wagon R	Hybrid FX-S 2WD	25.2km/L	23.8km/L	Light vehicle
19th place	Honda	Freed	e:HEV G 2WD	25.6km/L	20.2km/L	minivan
20th place	Daihatsu	Mira e:s	2WD all cars	25.0km/L	22.5km/L	Light vehicle

Ranking Analysis

1. Toyota’s strength : Toyota accounts for 10 of the top 20 models
2. The advantages of hybrids : Many of the top models are hybrids
3. Light vehicles perform well : High fuel efficiency thanks to light weight
4. Advances in SUVs : Even SUVs, which were previously considered to have poor fuel economy, now achieve high fuel economy

Fuel efficiency ranking by body type

Light Car Division TOP 5

Ranking	Manufacturer	Car name	WLTC mode fuel economy	Features
1st place	Suzuki	Alto	27.7km/L	Mild hybrid
2nd place	Suzuki	Alto Lapin	26.2km/L	Stylish design popular with women
3rd place	Suzuki	Wagon R	25.2km/L	Combining practicality and design
4th place	Suzuki	Spacia	25.1km/L	A representative super height wagon
5th place	Daihatsu	Mira e:s	25.0km/L	Achieving high fuel efficiency at a low price

Alto/Carol

Coming in at number one in the ranking of light vehicles with the best fuel economy is the Alto. With a fuel economy of 25.0km/L, it’s one of the best for a light vehicle, while also keeping the base price low, making it a truly eco-friendly car. It’s equipped with a mild hybrid system, which uses deceleration energy to generate electricity to power the motor during acceleration and assist the engine. The second-placed Carol is an OEM version of the Alto.

Related reading

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Compact Car Category Top 5

Ranking	Manufacturer	Car name	WLTC mode fuel economy	Features
1st place	Toyota	Yaris	36.0km/L	Best fuel economy of all models
2nd place	Toyota	Aqua	34.6km/L	A representative hybrid-only vehicle
3rd place	Honda	fit	30.2km/L	Equipped with e:HEV system
4th place	Nissan	Notes	28.4km/L	The e-POWER system is a distinctive feature
5th place	Suzuki	Swift	25.4km/L	Achieving both driving pleasure and fuel economy

Toyota Yaris

Coming in at number one in the ranking of fuel-efficient cars is the Yaris. This popular compact car boasts top-level fuel economy for a hybrid vehicle, at 36.0km/L, while also offering a nimble ride. The wide range of body colors and dynamic styling are also part of the appeal of the Yaris. Another recommended feature of the Yaris is that it comes standard with an advanced preventative safety package on most grades, helping to keep you safe on highways and in parking lots.

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SUV category TOP5

Ranking	Manufacturer	Car name	WLTC mode fuel economy	Features
1st place	Toyota	Yaris Cross	30.8km/L	The fuel-efficient compact SUV
2nd place	Toyota	Rise	28.0km/L	Joint development with Daihatsu
2nd place	Daihatsu	Rocky	28.0km/L	Sister car of the Raize
4th place	Lexus	LBX	27.7km/L	Lexus’ first compact SUV
5th place	Lexus	UX	26.3km/L	Premium compact SUV

Minivan category TOP 5

Ranking	Manufacturer	Car name	WLTC mode fuel economy	Features
1st place	Toyota	Sienta	28.8km/L	A classic compact minivan
2nd place	Honda	Freed	25.6km/L	High fuel economy despite three rows of seats
3rd place	Toyota	Noah	23.4km/L	Equipped with the latest hybrid system
4th place	Toyota	Voxy	23.0km/L	Noah’s sister car
5th place	Nissan	Serena	20.6km/L	Adopts e-POWER system

Sedan category TOP 5

Ranking	Manufacturer	Car name	WLTC mode fuel economy	Features
1st place	Toyota	Prius	32.6km/L	Synonymous with hybrid cars
2nd place	Toyota	Corolla	30.2km/L	The world’s best-selling model
3rd place	Toyota	Corolla Axio	27.8km/L	A classic compact sedan
4th place	Honda	Accord	23.8km/L	High fuel economy despite being a high-end sedan
5th place	Lexus	ES	22.3km/L	Premium Sedan

Toyota Prius

The Prius, ranked third in Toyota’s fuel-efficient car rankings, boasts a fuel efficiency of 32.6km/L. This low fuel consumption is achieved through a variety of innovations. The Prius is equipped with numerous features to improve fuel efficiency, including an efficient engine, a design that reduces air resistance, and selectable driving modes. In addition to its low fuel consumption, the car also offers a comfortable ride. Its lightweight body, low center of gravity, and reduced shock during driving all contribute to increased stability and ease of driving.

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How to choose a fuel-efficient car

1. Consider the environment

City-center use

• Hybrid cars are the most effective
• The motor assists when stopping and starting at traffic lights
• Recommended vehicles: Yaris, Aqua, Prius

Mainly highway use

• Even with gasoline vehicles, there may be little difference in fuel economy.
• Diesel cars are also an option
• Recommended vehicles: Corolla Touring, Mazda CX-30

Using both

• Hybrid cars are all-purpose
• Recommended car models: Fit, Note

2. Balance between body size and purpose

Living alone/Couple

• Light cars and compact cars
• Recommended car models: Alto, Yaris

Family

• Minivans and SUVs
• Recommended vehicles: Sienta, Yaris Cross

3. Balance between price and fuel efficiency

Emphasis on initial cost

• Lightweight gasoline-powered vehicles
• Daihatsu Mira e:S, Suzuki Alto

Emphasis on long-term costs

• Hybrid car
• Toyota Yaris, Aqua

Explanation of fuel efficiency improvement technologies

Hybrid system

Toyota Hybrid System (THS)

• Optimal control of engine and motor
• Representative models: Prius, Yaris, Aqua

Honda e:HEV

• Motor-based driving system
• Representative models: Fit, Vezel

Nissan e-POWER

• The engine is used only for generating electricity, and the drive is 100% motorized
• Representative models: Note, Serena

mild hybrid

structure

• A small motor assists the engine
• Equipped with ISG (generator with motor function)
• Representative models: Suzuki Alto, Wagon R

Other fuel efficiency improvement technologies

CVT (Continuously Variable Transmission)

• Always maintains optimum engine speed
• Greatly contributes to improved fuel efficiency

Idling stop

• Automatically shuts off the engine when the vehicle is stopped
• Reduce fuel consumption

Lightweight Technology

• Use of high-tensile steel plates
• Use of resin parts

Improved aerodynamic performance

• Improved Cd value (air resistance coefficient)
• Installing the under cover

Fuel-efficient driving techniques

The basics of eco-driving

1. Slow starting and acceleration

• Step on the accelerator slowly
• Don’t increase engine speed too much

1. Driving at a constant speed

• Using Cruise Control
• Avoid sudden acceleration and deceleration

1. Early braking

• Utilizing engine braking
• Regenerative braking is effective in hybrid vehicles

Maintenance points

Regular inspection

• Engine oil change
• Air filter cleaning and replacement
• Spark plug replacement

Tire maintenance

• Maintaining proper tire pressure
• Choosing eco-friendly tires

Vehicle weight reduction

• Removal of unnecessary baggage
• Fill up with fuel only as needed

Summary of choosing a fuel-efficient car

Recommended car models by purpose

Anyway, fuel efficiency is the priority

• 1st place: Toyota Yaris (36.0km/L)
• 2nd place: Toyota Aqua (34.6km/L)

Cost-effectiveness

• 1st place: Suzuki Alto
• 2nd place: Daihatsu Mira e:S

Family-friendly

• 1. Toyota Sienta (minivan)
• 2nd place: Toyota Yaris Cross (SUV)

Luxury-oriented

• 1st place: Lexus LBX (SUV)
• 2nd place: Lexus UX (SUV)

The pros and cons of fuel-efficient cars

merit

• Significant reduction in fuel costs
• Environmental Considerations
• tax incentives
• Extended range

Disadvantages

• The vehicle price is high
• High maintenance costs
• Battery replacement cost

Five types of taxes on cars: Is it more economical to have a good fuel economy?

Currently, there are five main types of taxes levied on cars . The tax system underwent major revisions in 2019, with the “Automobile Acquisition Tax” being abolished and replaced by an “Environmental Performance Tax.”

Among these, the “gasoline tax,” “environmental performance tax,” and “automobile weight tax” are tax benefits that are given to cars with good fuel economy. The “environmental performance tax” and “automobile weight tax” in particular offer significant benefits.

car weight tax

Standard car: When purchasing a new car (3 years) Automobile weight tax

When purchasing a new car, the first year is three years.

Eco-car tax reduction (automobile weight tax) for standard automobiles

For vehicles that were exempt from the eco-car tax reduction on automobile weight tax when newly registered between May 1, 2021 and April 30, 2023, the exemption will also be applied at the time of the first renewal inspection. When conducting renewal inspections or registering new used cars, the standard tax rate will be applied to cars that meet the current requirements for the eco-car tax reduction.

Vehicle weight	Vehicles eligible for eco-car tax reductions , such as electric vehicles and fuel cell vehicles	Vehicles eligible for the 25% eco-car tax reduction include gasoline and hybrid vehicles.	Vehicles eligible for a 50% eco-car tax reduction: Gasoline and hybrid vehicles	No eco-car tax reduction
Less than 500kg	duty free	5,600 yen	3,700 yen	12,300 yen
1,000kg or less	duty free	11,200 yen	7,500 yen	24,600 yen
1,500kg or less	duty free	16,800 yen	11,200 yen	36,900 yen
2,000kg or less	duty free	22,500 yen	15,000 yen	49,200 yen
2.500kg or less	duty free	28,100 yen	18,700 yen	61,500 yen
3,000kg or less	duty free	33,700 yen	22,500 yen	73,800 yen

Environmental performance

From October 1, 2019, automobile acquisition tax will be abolished and an environmental performance tax will be introduced. Hybrid cars will be exempt, but if you purchase a gasoline-powered car, you can expect to incur a fee.

Environmental performance

Fuel efficiency, etc.	Registered vehicle	Light vehicle
Electric vehicles, etc.	Tax exemption	Tax exemption
★★★★ and meets 2020 fuel economy standards + 30%	Tax exemption	Tax exemption
★★★★ and meets 2020 fuel economy standards + 20%	Tax exemption	Tax exemption
★★★★ and meets 2020 fuel economy standards + 10%	1.0%	Tax exemption
★★★★ and meets 2020 fuel economy standards	2.0%	1.0%
★★★★ and meets 2015 fuel economy standards + 10%	3.0%	2.0%
Other than the above	3.0%	2.0%

*Based on the latest automobile information

Hybrid system types

Parallel system (mild hybrid)

The engine is always running, and the motor is used to assist. Generally, the motor output is low, and a small battery is used. The advantage is that fuel efficiency is improved without increasing the unit price too much. It is often used in light vehicles.

Split system/series-parallel system (strong hybrid, hybrid, PHEV)

The engine is used for both power generation and driving. Basically, the motor drives the vehicle when it starts moving, and the engine starts at a certain speed, reducing engine power and improving fuel efficiency. The base price is higher than that of gasoline models.

The engine is used for both power generation and driving. It was first adopted by Toyota’s Prius. Toyota vehicles generally use the split system.

Series system (range extender, different names used by different companies)

The engine is used solely to generate electricity and the vehicle is driven solely by the motor. When electricity is insufficient, the engine generates electricity. In other words, it can be said to be an electric vehicle (BEV) that does not require charging. The driving sensation is that of an electric vehicle itself, with distinctive driving characteristics and the ability to accelerate and decelerate using only the accelerator pedal. It is also possible to derive it from an electric vehicle (BEV).

The engine is used solely for generating electricity and the vehicle is driven solely by the motor. Examples include Nissan’s “e-POWER” and Daihatsu’s “e-SMART HYBRID.”

How to choose a car model

We’ve explained the three types of hybrids, and while choosing a hybrid car does mean the vehicle will be more expensive , it also comes with many benefits, such as government tax incentives, loan interest rates, insurance, resale value, and fuel economy. If you’re looking for a model closer to a futuristic EV, choose the series system, or the established and time-tested split system. If you’re looking for a more affordable option, go for the parallel system. As we move toward a carbon-neutral era, choosing a hybrid car over a gasoline model offers many long-term benefits, including better resale value and fuel economy. We hope this information will be helpful when making your purchase.

A word from the editorial department

Fuel efficiency trends in 2025

Automakers will continue to develop fuel-efficient technologies, with progress expected in the following areas:

When choosing a fuel-efficient car, it’s important to consider not only the catalog fuel economy but also the actual fuel economy, and to choose a model that suits your usage environment and budget. Use the rankings and selection tips introduced in this article as a reference to find the fuel-efficient car that’s best for you.

Among standard cars, hybrid vehicles boast overwhelmingly low fuel consumption. Toyota cars, in particular, dominate the rankings due to their advanced technology. Recently, the number of cars that are not only fuel-efficient but also good to drive has increased, and the evolution of cars shows no signs of stopping. Fuel efficiency is improving year by year for both minicars and standard cars as a whole, and the options are expanding. In addition to fuel efficiency, it is important to compare and consider various factors such as design, price, and performance to choose the car that is best for you.

Nowadays, many companies have a wide range of hybrid models in their lineup, but even the term “hybrid” can mean a variety of different systems. We’ve put together a detailed summary of the differences between them. We hope that this information will help you understand the differences and advantages before making your purchase.