When considering the fuel efficiency of a vehicle, Miles Per Gallon (MPG) is the standard metric. This measurement tells you just how far your car can travel on a single gallon of fuel, roughly 4.5 liters. The range in MPG can vary dramatically, from a mere 11 miles per gallon at the lower end to significantly higher figures as technology advances.
Historically, diesel engines have often been lauded for their superior fuel economy compared to their petrol counterparts. However, with the rise in popularity of petrol and hybrid cars among drivers, particularly in the UK, it’s essential to explore the most fuel-efficient options across both categories. This guide will delve into some of the top contenders in fuel economy from both the petrol and diesel worlds.
It’s important to remember that MPG figures can fluctuate based on individual driving habits. A more aggressive driving style will typically result in lower fuel economy compared to a smoother, more measured approach.
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For consistency and comparison, the MPG figures mentioned below are based on official average fuel economy ratings, determined through the Worldwide Harmonised Light-duty Vehicles Test Procedure (WLTP). Let’s explore ten of the most fuel-efficient cars currently available.
- BMW 330e
- Toyota Prius
- Suzuki Swift
- Toyota Corolla Touring Sports
- Hyundai IONIQ
- Mercedes-Benz E300 de
- Peugeot 208
- Vauxhall Corsa
- Skoda Octavia
- Volkswagen Golf
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Top Petrol & Hybrid Cars with High MPG
This section highlights petrol and hybrid models that stand out for their exceptional fuel economy, proving that efficiency doesn’t have to compromise performance or style.
1. BMW 330e – 217.3 mpg
The BMW 330e demonstrates that economical hybrid cars can be both exciting and efficient. This model combines a 2.0-liter petrol engine with an electric motor to deliver both strong acceleration and impressive fuel economy.
According to Sam, a motoring expert, “The 330e plug-in hybrid is often the most talked-about BMW 3 Series variant, largely due to its capability to operate on electric power alone for approximately 30 miles and achieve over 100 mpg in combined cycle testing.”
In line with the rest of the BMW 3 Series range, the 330e boasts a high-quality interior packed with advanced technology. For those considering a used option, used BMW models, including the 330e, can often be found at attractive prices.
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2. Toyota Prius – 67.0 mpg
Toyota’s Prius is available in both self-charging hybrid and plug-in hybrid versions. The plug-in variant offers a superior official economy of 235.4 mpg, provided the battery is regularly charged.
The self-charging Prius, which does not require plugging in, is more budget-friendly on the used car market and still achieves close to 70 mpg, as stated by Toyota. Plug-in hybrid Prius models offer the flexibility of electric-only driving for shorter distances, further enhancing fuel savings.
Inside, the Prius is well-appointed, typical of Toyota’s commitment to high standards and comprehensive equipment levels across their range.
Sam notes, “The Toyota Prius is a common sight as a taxi, and for good reason. It’s known for its exceptional reliability and low running costs, making it a smart choice for economical transportation.”
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3. Suzuki Swift – 64.0 mpg
Every current Suzuki Swift supermini model is equipped with Suzuki’s ‘Boosterjet’ hybrid engine. This mild hybrid system utilizes an electric motor to reduce the load on the petrol engine.
While the ‘mild’ nature of the hybrid system means the car cannot run solely on electric power, it still provides enhanced fuel economy compared to a traditional petrol engine, along with a boost in acceleration.
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4. Toyota Corolla Touring Sports – 63.8 mpg
After a hiatus from the UK market, the Toyota Corolla has returned, now enhanced with hybrid technology. The Touring Sports variant, an estate model, alongside the hatchback version, offers a pleasing driving experience with well-tuned suspension and responsive handling.
Each Corolla model comes with a generous level of standard equipment and a choice of two petrol-hybrid engines: a 1.8-liter or a 2.0-liter, both delivering up to 63.8 mpg.
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5. Hyundai IONIQ – 60.0 mpg
Similar to the Toyota Prius, the Hyundai IONIQ is available as a self-charging hybrid, with the plug-in hybrid version presenting even greater value, especially in the used car market.
This Hyundai combines a 1.6-liter petrol engine with an electric motor, offering an electric-only range of up to 39 miles on a full charge.
Sam highlights the IONIQ’s comprehensive cost-effectiveness, noting, “Beyond just fuel savings, the IONIQ typically benefits from lower insurance premiums and reduced maintenance costs, making it an economically sound choice overall.”
The IONIQ is well-equipped as standard, offers a larger boot space than the Prius, and maintains a strong official fuel economy rating, even if marginally less than the Toyota.
The Most Fuel-Efficient Diesel Cars Available
Diesel cars, particularly modern iterations, still hold a strong position in fuel efficiency, especially for those who frequently undertake longer journeys. Here are some of the top diesel models known for their impressive MPG.
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1. Mercedes-Benz E300 de – 217.3 mpg
It’s not an error – the Mercedes-Benz E300 de is indeed a plug-in hybrid diesel, achieving an astonishing official MPG figure. This model is engineered to maximize mileage, but to reach its peak efficiency, regular battery charging is crucial.
Mercedes claims that with a fully charged battery, the E300 de can travel up to 33 miles on electric power alone – sufficient for daily commutes in urban environments.
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2. Peugeot 208 1.5 Blue HDi – 71.4 mpg
Introduced in 2019, the Peugeot 208 diesel hybrid is notable for its stylish design in the supermini category. This five-door model features distinctive LED lighting and a 1.5-liter diesel engine that officially delivers over 70 mpg.
The interior of the baby Peugeot is equally appealing, featuring a modern dashboard design where the instrument panel is viewed above, rather than through, the steering wheel.
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3. Vauxhall Corsa 1.5 Turbo D – 70.6 mpg
The visual similarities between the Vauxhall Corsa and Peugeot 208 are no coincidence, as both brands are part of the Stellantis group. They share many underlying components, including the engine and mechanical elements, which explains the similar fuel economy figures. The Vauxhall Corsa offers comparable efficiency and performance to its Peugeot counterpart.
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4. Skoda Octavia 2.0 TDI SE – 68.9 mpg
The Skoda Octavia is recognized as a practical family car, offering substantial interior space, especially the Estate model with its large boot. This particular version enhances its appeal with excellent fuel economy.
The Skoda Octavia 2.0-litre TDI engine, producing 150hp, prioritizes torque over outright power. This allows for relaxed motorway driving, maintaining high gear and cruising speed without frequent gear changes.
Sam praises the Octavia for its value proposition: “It combines outstanding fuel economy with class-leading reliability, all at a price point that is accessible, making it a smart choice for budget-conscious buyers seeking efficiency and practicality.”
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5. Volkswagen Golf 2.0 TDI – 68.9 mpg
Mirroring the relationship between Peugeot and Vauxhall, Skoda and Volkswagen also share engineering platforms. This Mk8 Golf model utilizes the same 150hp diesel engine and six-speed manual gearbox as the Octavia.
While the Golf may not offer the same level of spaciousness as the Octavia, it presents a more premium feel, particularly with digital instruments and a large infotainment screen in most trims. Used VW Golf models, including the diesel variants, are often available at competitive prices.
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Maximizing Your Car’s MPG: Driving Habits Matter
Choosing a fuel-efficient car is a significant step towards saving money on fuel and reducing your environmental footprint. Modern petrol engines, especially those with hybrid assistance, and newer diesel engines are designed for optimal fuel consumption, particularly on longer journeys.
However, even with a fuel-efficient vehicle, driving habits play a crucial role in achieving the highest possible MPG. Here are some key adjustments you can make to your driving style to enhance fuel economy.
1. Reduce Air Conditioning Use
Switching off your air-conditioning can noticeably improve fuel efficiency. The air conditioning system places a significant load on the engine, requiring extra power to operate, which in turn increases fuel consumption.
2. Drive Smoothly
Adopting a smooth driving technique is highly effective in reducing fuel consumption. Maintaining a steady speed and avoiding sudden acceleration and braking, especially on the motorway, helps to keep engine revolutions and fuel use consistent and economical. Gentle starts and smooth transitions are also beneficial in urban driving.
3. Combine Short Trips
Whenever possible, combine multiple short journeys into one longer trip. Engines operate most efficiently once they have reached their optimal operating temperature. Short trips prevent the engine from fully warming up, leading to increased fuel consumption as the engine works harder to reach efficiency. Allowing your engine to warm up properly on longer trips ensures fluids circulate effectively, optimizing performance and economy.
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