What are the top 10 most fuel-efficient cars of 2024?

Most fuel-efficient cars of 2024 - Our criteria

Over the years, cars have become more economical and fuel-efficient. This is due to carmakers prioritising the use of hybrid and electric technology. Fuel efficiency is an important factor for many people when choosing a new car.

So, we have put together a list of our top 10 most economical cars for you to pick from. We chose these cars based on the following criteria:

• Must have an internal combustion engine
• Use WLTP figures
• Generates more than 50mpg

Firstly, we wanted to discuss how fuel economy is measured. There are different measures which you will see being used. You can also jump straight to our list of the most fuel-efficient cars.

Measuring fuel economy

The primary measure for fuel economy is the New European Driving Cycle (NEDC) fuel-economy testing method. This measure was introduced in 1980 and measures fuel consumption of a vehicle driving in varying test cycles, for example:

• Urban driving
• Extra urban
• Combined

However, NEDC testing measures and processes had not been updated since 1997. NEDC testing is also conducted in laboratories and not in the real world on real roads. As such, the credibility and accuracy of the measure has been questioned. Subsequently, NEDC testing has been superseded by the World Harmonised Light Vehicle Test Procedure (WLTP). This came into effect in the UK for all new cars sold as of September 2019.

WLTP testing is carried out on actual roads. Tests are over longer distances, at higher speeds and with shorter stops. WLTP testing provides us with a more accurate representation of fuel economy figures. In this article, we will utilise both WLTP and NEDC figures. WLTP provides a more credible measure of fuel efficiency so will be used where possible.

Keep in mind that hybrid cars have a combined WLTP figure which considers both the battery and engine’s performance. This is often why they seem so much higher than non-hybrid vehicles.

Our top 10 most fuel efficient cars of 2024

1. BMW 330e (2019 – onwards) - 201.8-217.mpg

   

   A used BMW 3 Series, manufactured post-2019, is one of the most economical cars available on the market. The 330e offers a combined claimed economy of up to 201.8-217.3mpg*. This model features a 2.0-litre, four-cylinder traditional combustion engine. Being a hybrid, it is mated to an electric motor. This offers an output of 288bhp and 420Nm of torque, reaching 0-62mph in an impressive 5.8 seconds. This means you won’t have to forego performance for fuel efficiency, the 330e offers it all!

   The 330e is also equipped with an array of driver convenience systems, industry-leading infotainment technology and a luxurious and modern cabin. Additionally, BMW have their EfficientDyanmics strategy which encompasses every vehicle in their line-up. The strategy aims to minimise fuel consumption and CO2 emissions, adding to BMW’s commitment to offering some of the most fuel-efficient models on the market.

   Find a used BMW 330e for sale

2. Mercedes-Benz E300de (2016 – onwards) – 176.6-201.8mpg

   

   A Mercedes-Benz E300de is another one of the most fuel-efficient cars in the UK in 2024. It offers a combined fuel economy of 176.6-201.8mpg*. The E300de comes in both saloon and estate body types. The E-Class offers drivers an impressive array of safety and driver assist technology, alongside innovative in-car entertainment solutions. The model is a plug-in hybrid with a diesel-electric powertrain. It offers a claimed economy of up to 201.8mpg. A four-cylinder, 2.0-litre diesel engine outputs 311bhp and 700Nm of combined torque.

   Although the claimed economy range of the Mercedes-Benz E300de is slightly lower than the BMW 330e, you benefit from a slight increase in 0-62mph time of 0.1 seconds. The E300de goes from 0-62mph in 5.7 seconds. If you keep the plug-in hybrid battery fully charged, you can enjoy an electric-only range of up to 30 miles. A used E300de is an economical car to consider if you are looking for luxury in your next vehicle.

   Find a used Mercedes-Benz E300 de for sale

3. Vauxhall Corsa (2019 – onwards) – 70.6mpg

   

   Looking for fuel-efficient cars but don’t want a hybrid? Look no further than the humble Vauxhall Corsa hatchback. 2019 brought a completely new look for the model as new company owners, PSA Group, took over the brand. If you opt for a Corsa F 1.5-litre, four-cylinder turbo diesel engine, you can expect fuel economy of up to 70.6mpg*. As this version of the Corsa was manufactured post-2019, it does not have an NEDC figure. It’s one of the most fuel-efficient diesel cars on the market. The Corsa will take you from 0-62mph in 9.6 seconds, generating 100bhp and 250Nm of torque.

   Inside you can expect a variety of high-tech features and gadgets to make your driving experience more convenient and enjoyable. The model even incorporates a heated steering wheel. This makes those cold winter mornings a little easier. You will also find a touchscreen infotainment system for all your in-car entertainment needs. The Corsa is an edgy, economical and fun all-rounder!

   Find a used Vauxhall Corsa for sale

4. Škoda Octavia (2020 – onwards) – 67.3mpg

   

   A Mk4 Škoda Octavia is another economical car you should consider. The model shares a platform with the Volkswagen Golf. It’s often referred to as offering Volkswagen Passat-like space at Golf-like prices. By choosing an Octavia, you can prioritise versatility, performance and efficiency without a hefty price tag at point of sale or when you’re at the pumps.

   Choose the four-cylinder, 2.0-litre TDI diesel engine option for fuel economy of up to 67.3mpg*. This model offers 116bhp and 300Nm of torque, allowing it to reach 0-62mph in 10.3 seconds. An Octavia is available in hatchback and estate body types.

   Find a used Škoda Octavia for sale

5. Volkswagen Golf (2020 – onwards) – 60.9-63.1mpg

   

   Looking for fuel-efficient cars but still want something which can hold its own on the roads? The Volkswagen Golf is an iconic and timeless model which has been on our roads since 1974. The model has evolved over eight generations since but is still one of the most popular cars in the world. As the Mk8 Golf launched post-2020, it does not undergo NEDC testing.

   It has a four-cylinder, turbocharged direct injection diesel engine. This version of the Golf can generate 115bhp and 300Nm of torque, achieving 0-62mph in 10.2 seconds. And it is frugal, offering up to 63.1mpg*. Inside, you can expect a spacious, modern cabin packed with advanced driver equipment. A Mk8 2.0-litre Volkswagen Golf TDI is a fantastic example of the most economical cars and of German automotive engineering excellence.

   Find a used VW Golf for sale

6. Hyundai IONIQ (2019) - 62.8mpg

   

   Another hybrid which you need to consider when looking out for the best economical cars on the market is the Hyundai IONIQ. A used 2019 1.6-litre IONIQ in the Premium trim will offer a combined economy of up to 68.2mpg*. The NEDC figure for the IONIQ is higher at 78.5mpg. The four-cylinder petrol mild-hybrid engine offers 141bhp and 265Nm of torque. It will take you from 0-62mph in 10.8 seconds. This is slightly faster than the Toyota Corolla. The IONIQ’s top speed is 115mph. The plug-in hybrid version will cover 32 miles on electric power only due to its 8.9Wh battery.

   The facelift in 2019 brought with it a new ‘cascading’ grille. The grille provides the model with active air slips. These open and close to enhance the model’s fuel efficiency. Active air vents boost fuel economy at high speeds. They achieve this by lessening the amount of aerodynamic drag through the reduction of unnecessary air intake. All these features combine to make the IONIQ another great example of one the most fuel-efficient cars in the UK.

   Find a used Hyundai IONIQ for sale

7. Toyota Corolla (2019 – onwards) - 57.6-62.8mpg

   

   A 2020 Toyota Corolla hybrid is also considered one of the most economical cars on the roads today. The model is available in both estate and hatchback body types. Choose a 1.8-litre VVT-I Hybrid Icon estate version and you’ll get economy of up to 62.8mpg*. The NEDC figure is higher, claiming 85.6mpg. Meanwhile, the four-cylinder petrol engine is mated to an electric battery. With an output of 122bhp and 142Nm of torque, this iteration will do 0-62mph in 10.9 seconds.

   An exciting feature is the Toyota’s MyT app which can be used to remotely control the car’s functions. You can use the app to turn on the car’s climate control before you even get in – definitely handy for those cold winter mornings. In 2020, What Car? awarded this model the title of ‘Best Hybrid Car’. The Corolla is well-equipped, practical, fuel-efficient and affordable!

   Find a used Toyota Corolla for sale

8. Renault Clio (2020 – onwards) – 67.2mpg

   

   Another one of the most fuel-efficient diesel cars available is the Renault Clio. There have been five generations of the Clio since its debut in 1990, but choose the 1.5 dCi 85 engine for up to 67.2mpg*. It’s also worth noting that this is a great car for those who hit the motorways often.

   The four-cylinder diesel engine offers 90bhp and 220Nm of torque, taking you from 0-62mph in 12 seconds. Some used models may be equipped with Renault’s Traffic & Motorway Assistance Pack – this innovative technology enables the car to automatically accelerate, brake and steer when travelling in low-speed traffic – helping you enhance your economy out on the roads. Overall, the Clio is an extremely reliable, affordable and economical supermini car.

   Find a used Renault Clio for sale

9. Kia Niro (2020) - 53.3-61.4mpg

   

   The Kia Niro was introduced to the ever-competitive crossover market in 2016. It was the first of its kind to come equipped with an efficient 1.6-litre petrol hybrid engine, making it a trailblazer in its vehicle class. A used Kia Niro 2 1.6 GDi Hybrid offers a combined fuel economy of up to 61.4mpg*. The NEDC figures are higher at 64.2-76.3mpg. This model has a four-cylinder petrol engine mated to a 32kW electric motor, and it does not require plugging in for charging.

   The Niro 2 is the entry-level trim in the line-up and will take you from 0-62mph in 11.5 seconds, offering 139bhp and 147Nm of torque. Despite being entry-level, the Niro 2 is well-equipped. It includes lots of convenient driver-assist technology, safety equipment and in-car entertainment solutions. The Niro is practical, versatile and fuel-efficient.

   Find a used Kia Niro for sale

10. Peugeot 108 (2014 - 2022) – 58.9mpg

    

    Launched in March 2014 at the Geneva Motor Show, a Peugeot 108 is a charming city car which was introduced to replace the 107, and it makes a great option for new drivers. The entry-level 1.0-litre petrol engine version of a used Peugeot 108 is one of the most fuel-efficient petrol cars on the market. This model has a three-cylinder engine, generating 72bhp and 93Nm of torque, accelerating from 0-62mph in 13.8 seconds. The 108 offers up to 58.9mpg (WLTP), NEDC figures claim 68.9-74.3mpg*.

    Production of the model ceased in 2021, with no successor announced. You will still find many used Peugeot 108 cars for sale when you browse our stock. With an array of practical yet peppy interior features, this model offers drivers affordability and efficiency all in one.

    Find a used Peugeot 108 for sale

How to improve fuel economy

You can improve your fuel economy a number of ways. The best place to start is by choosing a car, like the ones on this list, which are already capable of achieving a high mpg figure. You should also consider choosing a car with a mild hybrid or full-hybrid powertrain for great fuel economy. However, it’s also important to remember that when you’re out on the road, there are some tips and tricks which you can implement yourself.

Smooth driving

Avoid harsh acceleration and braking and drive at a consistent speed. By doing so, you put less strain on the engine and use less fuel. Harsh acceleration results in the engine having to burn through more fuel to generate more power. Harsh braking also dissipates kinetic energy as waste heat. Taking it smooth and steady out on the roads means that you will benefit from improved fuel efficiency.

Avoid short trips

Short trips in the car aren’t great if you are looking to improve your fuel economy. This is because traditional combustion engines need time to heat up and get fuel pumping round the engine. Taking the car on a journey that would take you five or ten minutes to walk is not the way to increase your fuel efficiency.

Regular maintenance

Keeping your car regularly maintained is another thing that you can do. Regular oil changes, filter replacements and servicing will contribute to better fuel efficiency. For example, a clogged air filter restricts airflow to the engine, causing it to work harder and consume more fuel. Additionally, ensuring your tyres are at the correct air pressure level is another way to improve fuel efficiency. As you naturally lose PSI by around one or two units per month, it’s important to carry out regular pressure checks. If your tyre is underinflated by 20%, fuel consumption increases by 4%.

Reduce unnecessary weight

Extra weight in a car increases your fuel consumption. This is because the engine needs to work harder to move more weight, especially during acceleration. It’s therefore a good idea to remove any unnecessary weight from your car. For example, driving around with unloaded roof racks increases your fuel consumption, so if you’re not using them, take them off the car.

Use cruise control

Many modern cars are fitted with cruise control. Using cruise control can be a good way to increase your fuel economy as you can set the car to travel at a consistent and steady speed. If you do a lot of motorway driving, you should definitely look to take advantage of your cruise control system.

Use your air conditioning sparingly

Air conditioning can increase fuel consumption, especially when travelling at higher speeds. Use it sparingly and consider opening windows when driving at lower speeds instead of using the air con. The air conditioning system places an additional load on the engine, especially during hot weather. Minimising its use reduces the engine's workload and conserves fuel.