Regan Brown
With the high cost of petrol and diesel, fuel economy and efficiency are important factors when choosing a new car. While diesel cars were once the most efficient option, the popularity of diesel has been in decline since 2015, and hybrid and plug-in hybrid cars have become an increasingly popular choice. Hybrid technology has boosted the efficiency of many modern petrol models, and some of the most fuel-efficient cars in the UK in 2025 include the Hyundai IONIQ, the Toyota Corolla, the BMW 330e, and the Toyota Yaris.
| Characteristics | Values |
|---|---|
| Fuel-efficient car models | Toyota Yaris Cross, Toyota Corolla, Mazda 2 Hybrid, Toyota Yaris, Honda Jazz, Citroen C3, Peugeot 208, VW Golf, Suzuki Swift, BMW 330e, Hyundai IONIQ, Mercedes-Benz E300de |
| Fuel-efficient car types | Petrol-electric hybrids, plug-in hybrids, diesel |
| Factors influencing fuel efficiency | Driving style, air-conditioning, driving conditions |
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Hybrid vs. diesel cars
Hybrid and diesel cars have their own advantages and disadvantages. While diesel cars are known for their better fuel economy, hybrids are becoming a popular solution to the UK's pollution problem. Hybrid vehicles use more than one means of propulsion, typically combining an electric motor with a petrol engine. The electric motor is used at lower speeds, making it efficient for driving in stop-start traffic.
Diesel engines, on the other hand, are more fuel-efficient on long-distance drives and provide superior torque for towing or carrying heavy loads. They are also now much smoother and quieter than they used to be, and they tend to feel quicker at low revs due to their high torque. However, diesel fuel tends to be more expensive than petrol, and diesel engines are more costly to produce and maintain due to the additional hardware required to reduce emissions.
Hybrid cars, particularly full hybrids, are fuel-efficient and reliable. Plug-in hybrids (PHEVs) can be extremely cheap to run if charged at home for short journeys. They are also more silent, affordable, and require less maintenance than diesel cars, making them a good choice for those looking for a refined driving experience. However, if you are unable to charge a PHEV at home, it may not be a suitable option.
Some of the most fuel-efficient hybrid cars in the UK include the Hyundai IONIQ, Toyota Corolla, BMW 330e, and the Suzuki Swift. The Mercedes E-Class is also a good choice for a diesel-hybrid car, offering a quiet engine, soft suspension, and excellent electric-only range.
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Plug-in hybrids
One of the most fuel-efficient plug-in hybrids is the BMW 330e, which offers a combined claimed economy of up to 201.8-217.3mpg. It has a 2.0-litre, four-cylinder traditional combustion engine and is mated to an electric motor, offering an output of 288bhp and 420Nm of torque. The Mercedes-Benz E300de is another highly fuel-efficient plug-in hybrid, with a claimed economy of up to 201.8mpg. It has a diesel-electric powertrain and offers an electric-only range of up to 30 miles.
Other notable plug-in hybrids include the Hyundai IONIQ, which has a 1.6-litre petrol engine mated to an electric motor, allowing up to 39 miles on a single charge. The Toyota Prius is also available as a plug-in hybrid, with a claimed economy of 235.4mpg. The Toyota Yaris Hybrid is another efficient option, utilising Toyota's hybrid system to achieve 70mpg-plus fuel economy.
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Turbochargers
A turbocharged engine has a great torque output at lower engine speeds, so it is important to shift to a higher gear early. The higher the engine speed, the higher the fuel consumption. Driving at lower speeds is one of the most effective ways to reduce the fuel consumption of a turbocharged car. Driving at 100 km/h instead of 120 km/h, for example, will only increase your travel time by seven minutes for an average commuting distance of 70 km. Driving at lower RPMs and using cruise control can also help to improve fuel efficiency.
Another way to improve the fuel efficiency of a turbocharged car is to avoid braking and accelerating erratically. Instead of braking at the last moment, it is better to coast and let the engine slow the car down by lifting off the accelerator. This is because the engine does not use any fuel when the throttle is not being applied.
Other factors that can affect the fuel efficiency of turbocharged cars include tyre pressure and aerodynamics. Under-inflated tyres create more rolling resistance and therefore consume more fuel. Cars designed with smoother lines and curves are likely to face less air resistance, improving fuel efficiency.
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Electric cars
When it comes to the most fuel-efficient electric cars in the UK, several models stand out. The Tesla Model 3 is highly efficient, offering a potential range of 436 miles with careful driving. The Fiat 500e is also impressive, achieving 200 miles from its 42kWh battery. The Vauxhall Corsa-e is another efficient option, with a 52kWh battery that provides a boosted range of 251 miles. The Renault 5 is worth considering, with a claimed economy figure of 4.8mpkWh, resulting in a range of 252 miles on a single charge.
Some other efficient electric cars include the Peugeot e-208, which has a range of up to 224 miles, and the Mini Electric, which has a smaller battery offering a range of 145 miles but benefits from being small and lightweight. The Kia Niro EV is a good choice, with a 64.9kWh battery that provides a range of 285 miles. The Citroen e-C4, with its 54kWh battery and a range of 257 miles, is another option.
It is important to consider various factors when assessing the efficiency of an electric car. Efficiency is influenced by battery size, driving style, weight, and outside temperature. Larger, SUV-style electric cars, for example, may be more affected by drag, reducing their range compared to sleeker, more aerodynamic designs. Warmer temperatures can also improve range, as colder weather requires more energy. Driving habits, such as speed and use of climate control, can significantly impact the range of an electric car.
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Real-world MPG
While official MPG figures are a useful starting point, they don't always reflect real-world fuel efficiency. Plug-in hybrids, for example, often struggle to match their impressive official MPG figures in the real world, especially on longer journeys where they rely on their internal combustion engines. However, if they are charged regularly and used for shorter trips, they can be extremely fuel-efficient.
The Toyota Yaris Cross, for instance, is a highly efficient hybrid car, combining a 1.5-litre petrol engine with an electric motor. It offers excellent fuel efficiency, a comfortable interior, and a lofty driving position. It can run purely on electric power at low speeds, and there's also a four-wheel-drive option.
The Mazda 2 Hybrid is another efficient option, achieving 70 mpg or more. It is the result of a partnership with Toyota and uses Toyota's hybrid system.
The Honda Jazz is a small, petrol-electric hybrid that is incredibly frugal while also being one of the more comfortable cars on the market. It offers excellent interior storage, and its 'magic' rear seats fold up, theatre-style, allowing you to carry tall items with ease.
The Suzuki Swace, which is essentially a Toyota Corolla Touring Sports, is another efficient option. It is described as a "self-charging hybrid", which means it can top up its battery without needing to be plugged in. It offers a comfortable ride and fantastic standard features, making it a great choice for families.
For those seeking a diesel option, the Peugeot 208 with the diesel BlueHDi 100 engine is an efficient choice, offering 72.2 mpg. It has a 41-litre fuel tank and provides a theoretical range of 650 miles.
The VW Golf with the 2.0-litre TDI engine is also an efficient diesel option, offering almost 70 mpg. The latest Golf offers various powertrains, including petrol and plug-in hybrid options. Even the 1.0-litre and 1.5-litre petrol engines return over 50 mpg.
The Citroen C3 is another efficient diesel option, offering a comfortable and refined driving experience.
For those seeking a luxury vehicle, the Mercedes-Benz E300de is a plug-in hybrid with a diesel-electric powertrain, offering a combined fuel economy of 176.6-201.8 mpg. It comes in both saloon and estate body types and offers an impressive array of safety, driver assistance, and in-car entertainment features.
Finally, the BMW 330e is a plug-in hybrid that offers a combined claimed economy of up to 201.8-217.3 mpg. It features a 2.0-litre, four-cylinder traditional combustion engine mated to an electric motor, offering an output of 288 bhp and 420 Nm of torque. It can go from 0-62 mph in 5.8 seconds.
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Frequently asked questions
The most fuel-efficient cars in the UK include the Toyota Yaris Cross, the BMW 330e, the Toyota Corolla, the Hyundai IONIQ, the Suzuki Swace, the Kia Picanto, the Mazda 2 Hybrid, the Citroen C3, the Honda Jazz, and the Mercedes-Benz E300de.
In the past, diesel cars were considered the most fuel-efficient. However, diesel has fallen out of favour in recent years due to the Volkswagen emissions scandal. Modern petrol engines with hybrid assistance and some newer diesel engines are now the most fuel-efficient, especially on longer journeys. Plug-in hybrids are also a good option for shorter trips if they are charged regularly.
The fuel efficiency of a car is measured in miles per gallon (MPG) ratings. The higher the MPG rating, the more fuel-efficient the car is. You can also refer to the official average fuel economy rating provided by the worldwide harmonised light-duty vehicles test procedure (WLTP).
You can improve the fuel efficiency of your car by turning off your air conditioning and making changes to your driving style. For example, heavy traffic and frequent stopping and starting can negatively impact your fuel economy.
The Toyota Yaris Cross is a fuel-efficient car that is also fun to drive. It offers a comfortable interior and a lofty driving position. The Mazda 2 Hybrid is another option that is described as "not boring" and "entertaining to drive."
