Regan Brown
Choosing the right fuel type for your car can be a tricky decision, with many factors to consider. The most suitable fuel type for your car depends on your driving habits, such as the distance and type of roads you drive on. For example, if you drive less than 60 miles and only in the city, a short-range electric car or plug-in hybrid may be the best option. On the other hand, if you frequently drive long distances on the motorway, a diesel or long-range electric car could be more efficient. Running costs are another key consideration, as fuel prices continue to rise. Other options to consider include bi-fuel cars, which can run on petrol and liquified petroleum gas (LPG), and mild hybrids, which are similar to conventional petrol cars but with additional technology to reduce fuel consumption.
| Characteristics | Values |
|---|---|
| Fuel types | Diesel, electric, hybrid, petrol, plug-in hybrid |
| Fuel economy | MPG (miles per gallon) |
| Fuel costs | Diesel is more expensive than petrol |
| Bi-fuel cars | Runs on two fuels, usually petrol and liquified petroleum gas (LPG) |
| Hybrid cars | Uses more than one type of power, combines petrol/diesel with an electric motor |
| Mild hybrid cars | Similar to a conventional petrol car, with additional technology to reduce fuel consumption |
| Real MPG | What Car? conducts tests to determine the actual fuel economy of cars |
| Fuel-saving tips | Close windows, clear out boot to reduce weight, change to higher gear earlier |
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Electric vs diesel
When it comes to choosing a car, there are many factors to consider, and fuel type is a key element. Traditionally, diesel cars have been the default choice for those who drive long distances, thanks to their fuel economy. However, with the recent rise in fuel prices, the cost of diesel has increased significantly. So, is it still worth opting for a diesel car over an electric one?
Running Costs
One of the biggest advantages of electric cars is their low running costs. Electric vehicles (EVs) are generally cheaper to run than diesel cars, thanks to lower electricity prices. The average model with a 200-mile range costs approximately £8 to charge at home, or around £6.50 for a 100-mile charge at a rapid charger. Free charging points can also be found at some workplaces or supermarkets. In contrast, diesel is one of the most expensive types of fuel due to higher taxation. The average price of diesel is £1.15 per litre.
Purchase Price
Diesel cars typically have a lower purchase price than electric cars. This is because electric cars are more expensive to produce, mainly due to the high cost of manufacturing large batteries. Raw materials for batteries need to be sourced, which is a costly process, and battery pack production is also expensive.
Environmental Impact
Electric cars produce zero emissions on the road, meaning they can pay off their "carbon debt". However, it's important to consider the overall environmental impact of both types of car. While electric cars don't burn fossil fuels, the power grid's carbon footprint can affect their environmental impact. If the electricity used to charge an EV comes from fossil fuels, it can still cause indirect emissions. On the other hand, diesel cars have an internal combustion engine (ICE) and emit harmful greenhouse gases, contributing to acid rain, smog, and respiratory disease.
Technology
Electric cars often feature more advanced technology than diesel cars, as manufacturers have typically only produced a single all-electric model. This means that electric cars may have better onboard technology, such as seamless acceleration and more powerful motors.
Fuel Type
Another consideration is the type of fuel available to you and the convenience of refuelling. While charging an electric car may take longer than filling up a diesel car at a station, the expanding network of charger stations makes electric cars an increasingly sensible option.
In summary, while diesel cars have a lower purchase price, electric cars offer lower running costs, better technology, and environmental benefits, making them a smart choice for those looking for a cost-effective and eco-friendly option. However, it's important to weigh the pros and cons based on individual needs, such as driving habits and access to charging options.
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Hybrid cars
There are several types of hybrid cars available, including mild hybrids, which are similar to conventional petrol cars but with additional technology to reduce fuel consumption and emissions. Mild hybrids typically have a small battery and an electric generator, which assists the engine and can harvest energy from braking. Plug-in hybrids are another option, which have a petrol or diesel engine and a larger battery pack that can be charged externally. These vehicles can drive for around 60 miles on electric power alone, making them a good choice for those who mainly do short journeys but occasionally need to travel further.
When choosing a hybrid car, it is important to consider factors such as fuel economy, performance, and price. Some hybrid cars, such as the 2025 Honda Civic Hybrid, offer excellent fuel efficiency and a sporty driving experience at a reasonable price. The 2025 Toyota Corolla Hybrid is another affordable option, offering good fuel economy and a comfortable interior. For those seeking a more premium option, the 2025 Lexus ES 300h offers excellent fuel efficiency, a spacious and well-appointed interior, and a smooth driving experience.
In addition to these options, there are several other hybrid cars available that offer good fuel efficiency, such as the 2025 Toyota Crown, which is a full hybrid capable of running on battery power alone. The Kia Niro is a small hybrid SUV with great fuel efficiency, a stylish cabin, and spacious seating. The Hyundai Elantra Hybrid is another excellent choice for fuel efficiency, with a spacious and well-built cabin. For those seeking an SUV, the Kia Sportage Plug-In Hybrid offers excellent gas mileage, a roomy cabin, and a smooth ride.
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Bi-fuel cars
Dacia is a popular manufacturer of bi-fuel cars, offering affordable LPG engines without compromising on technology.
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Real MPG tests
Real-world MPG testing is important because official fuel economy figures are often higher than what can be achieved in reality. This is because official tests don't require the engine to be worked as hard, so the resulting figures don't reflect what drivers are likely to achieve.
What Car? offers a Real MPG calculator that can be used to determine the fuel economy of a car. The calculator takes into account the car, driving style, and daily commute to provide precise fuel economy data. The website also provides a detailed explanation of how they conduct their Real MPG tests. Firstly, they inspect every car and weigh it to calculate loads for replicating the resistive forces acting on the vehicle when it's on their rolling road. Next, they check the tyre pressure and fit an exhaust connection to measure emissions. They then collect samples of each phase of the test (town, motorway, and rural) for their fuel consumption calculations. Finally, their Real MPG average is calculated and this figure is what users will see on their website.
Honest John also provides a way to calculate Real MPG. They explain that while trip computers are not 100% accurate, they are a good way of keeping check of MPG. They also provide instructions on how to calculate MPG manually. Firstly, fill your car with fuel until the pump clicks off and note the mileage. When your car is low on fuel, fill it again and record the number of litres. Then, convert this figure into gallons by dividing by 4.546. Finally, divide the number of miles covered by the number of gallons to get your MPG figure.
Fuelly is another website that helps users calculate their vehicle's fuel economy. It tracks gas mileage over time and helps calculate fuel expenses as you drive. Users can add their vehicle and track their fill-ups via web, apps, or SMS.
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Fuel-saving tips
There are many factors that impact your choice of car fuel, but running costs are a key element. While diesel cars have been the traditional choice for drivers who travel long distances, the recent inflation in fuel prices has made diesel significantly more expensive than petrol.
If you're looking to save on fuel costs, here are some tips to improve your car's fuel economy:
- Plan your route – Use Google Maps to plan the fastest routes with the least traffic congestion. This will help you avoid excessive idling and stop-start driving.
- Slow down – Most cars are most fuel-efficient when travelling between 50 and 80 km per hour. Vehicles use more fuel the faster they go. For example, at 120 km per hour, a vehicle uses about 20% more fuel than at 100 km per hour.
- Minimise drag – Take down roof boxes and remove racks when not in use. Driving with an empty roof box increases wind resistance and reduces fuel efficiency. Keeping your windows closed at high speeds will also help minimise drag.
- Reduce weight – Remove unnecessary items from your boot or back seat. The extra weight places a greater burden on your engine and increases fuel consumption.
- Use cruise control – If your car has this functionality, use cruise control on open roads or motorways to maintain a consistent speed and avoid unnecessary speed fluctuations, which can increase fuel consumption.
- Avoid aggressive driving – An engine burns less fuel at low revs, so changing to a higher gear earlier and avoiding hard acceleration will improve your fuel economy.
- Turn off the engine – If you're going to be stationary for more than a minute, it's better to turn off the engine than to let it idle.
- Combine trips – Instead of making multiple short trips, combine your errands into one longer trip to minimise the distance you travel and reduce fuel consumption.
- Switch to highway tyres – Aggressive off-road tyres can reduce fuel efficiency. Switching to on-road highway tyres can improve fuel efficiency on city roads.
- Keep your car well-maintained – Book an annual service that includes oil changes, air filter replacements, and spark plug inspections. A well-maintained car is more efficient and consumes less fuel.
- Check your tyres – Underinflated tyres create more rolling resistance, which reduces fuel efficiency.
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Frequently asked questions
Edmunds' Car Comparison Tool allows you to compare up to four vehicles at a time across various criteria, including pricing, features, mpg, trim levels, and fuel economy.
There are many factors to consider when comparing car fuels, such as the price per gallon, fuel economy (average city/highway miles per gallon), and the potential for rising fuel prices over time.
You can use an online fuel cost comparison calculator to compare the annual fuel costs of two different cars or fuels. This will take into account factors such as the price per gallon, fuel economy, and the number of miles driven annually.
A car fuel comparison calculator can help you understand the long-term costs of different fuels and vehicles, taking into account factors such as rising fuel prices and maintenance costs for different types of cars, like hybrids.
Yes, when comparing car fuels, it is important to consider factors such as the environmental impact and availability of alternative fuels, as well as the initial cost and maintenance requirements of different vehicle types.
