Sylvie Willis
The cost of fuel per mile for petrol cars depends on several factors, including the car's fuel efficiency, engine size, annual mileage, and the type of petrol used. For example, a car with lower fuel efficiency or a larger engine will generally have a higher cost per mile. Additionally, the price of fuel fluctuates and can impact the cost per mile. To calculate the cost of fuel per mile, one can use online calculators or a manual formula that takes into account the car's fuel efficiency, the price of petrol per litre, and the distance travelled. Understanding the cost of petrol per mile is essential for budgeting, especially with the recent rise in fuel prices.
| Characteristics | Values |
|---|---|
| Average cost of ultra low sulphur unleaded petrol in the UK | £1.48 per litre |
| Average fuel efficiency of a petrol car | 36 mpg |
| Cost per mile for a petrol car with average fuel efficiency | 15p-20p |
| Cost per mile for a medium engine petrol car (1401 to 2000 cc, 42 mpg) | 16p |
| Cost per mile for a large engine petrol car | 20p |
| Fuel cost for a car driving 5,000 miles a year | £861 |
| Fuel cost for a car driving 12,000 miles a year | £2,067 |
| Fuel cost for a car with 55 mpg driving 6,000 miles a year | £676 |
| Fuel cost for a car with 25 mpg driving 6,000 miles a year | £1,488 |
| Fuel cost for a typical diesel car for every 1,000 miles travelled | £151 |
| Fuel cost for a typical petrol car for every 1,000 miles travelled | £172 |
| Advisory fuel rate for fully electric cars from 1 June 2025 | 7 pence per mile |
| Advisory fuel rate for fully electric cars from 1 December 2022 | 8 pence per mile |
| Advisory fuel rate for liquefied petroleum gas cars | 20% lower than for petrol cars |
| Ways to improve fuel efficiency | Fixing serious maintenance problems, removing car accessories, placing signs or cargo on the roof, using properly inflated tires, driving smaller cars, driving slower, driving less, using public transportation, walking or biking |
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What You'll Learn
Fuel efficiency
The fuel efficiency of a vehicle can vary depending on several factors, including the size and type of the vehicle, the type of fuel it uses, and driving habits. As a general rule, smaller vehicles tend to have lower fuel consumption than larger, less efficient vehicles. Performance-focused cars will also consume more fuel than 'regular' cars, although many have moved to very small turbocharged engines to keep fuel consumption and carbon emissions low.
To calculate fuel efficiency, you can divide the distance travelled by the amount of fuel used. For example, if you travel 100 kilometres and use 10 litres of fuel, your fuel consumption is 10 litres per 100 kilometres.
There are several ways to improve your vehicle's fuel efficiency:
- Drive steadily and avoid aggressive acceleration and braking.
- Keep your tyres properly inflated.
- Use the recommended grade of motor oil.
- Plan your route carefully and use GPS route planners to calculate the straightest route with the fewest stops and least traffic.
- Drive a smaller car with a less powerful engine.
- Ensure your engine is properly tuned.
- Remove any accessories that increase drag, such as roof racks or spoilers.
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Engine size
The engine size of a vehicle plays a crucial role in determining its fuel efficiency, which is measured in miles per gallon (mpg) or kilometers per liter (km/L). A larger engine will generally consume more fuel per mile than a smaller engine, due to having to move a heavier object. However, it's important to note that the design of the vehicle and usage patterns can also significantly impact fuel efficiency.
To improve the fuel efficiency of a vehicle, it is recommended to maintain proper tyre pressure, use the correct motor oil, and drive in a steady manner. Additionally, removing unnecessary weight from the vehicle can help improve fuel efficiency, as a lighter car requires less fuel to move. Properly tuning the engine and ensuring all parts are in good condition can also contribute to better fuel efficiency.
The fuel efficiency of a vehicle can be calculated by dividing the distance travelled by the amount of fuel consumed. This value can then be used to determine the fuel cost per mile by multiplying it by the fuel price per gallon or liter. Online fuel cost calculators can assist with these calculations.
It is worth noting that fuel economy standards and measurements vary across different regions. For example, miles per gallon (mpg) is commonly used in the United States, the United Kingdom, and Canada, while kilometers per liter (km/L) is more common in other parts of the world. When comparing fuel efficiency, it is important to consider the type of gallon used, as there is a difference between imperial gallons and US gallons.
By understanding the factors that affect fuel efficiency, such as engine size and driving habits, individuals can make more informed choices to optimize their fuel consumption and reduce fuel costs. Additionally, choosing fuel-efficient vehicles and considering alternative transportation options, such as public transport or walking, can also help reduce fuel expenses.
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Type of petrol
There are several types of petrol available for vehicles, and the right type for your car will depend on the make and model. It's important to check your car manual to see which type of petrol is recommended by the manufacturer. Using the wrong type of petrol can cause serious damage to your car's engine.
One type of petrol is E10, which is a blend of regular unleaded with 10% ethanol. E10 is now widely available at most petrol stations and is usually cheaper than unleaded petrol. However, it can increase fuel consumption, particularly when used for the first time. It's important to note that E10 is not suitable for all cars, particularly older models. Cars and motorcycles made before 1986 should not use E10, and drivers of cars registered before 2002 are advised against using it.
Another type of petrol is liquefied petroleum gas (LPG), which has a lower volumetric energy density than petrol, resulting in a 20% lower miles per gallon (MPG).
Regular unleaded petrol has an octane rating, or Research Octane Number (RON), of 91. This is the lowest octane level and is usually the cheapest option. Most locally produced and Japanese cars are designed to run on regular unleaded. Premium unleaded petrol has a higher RON, making it more resistant to pre-ignition or engine knocking, and allowing your car to run more efficiently. However, using premium petrol in mass-market cars does not provide any benefits in terms of efficiency or performance, and it is more expensive. Therefore, it is generally recommended to use the type of petrol specified by your car's manufacturer.
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Maintenance
The cost of petrol per mile depends on several factors, including the car's fuel efficiency, engine size, type of petrol used, and the distance travelled.
Fuel Efficiency
The fuel efficiency of a car is typically measured in miles per gallon (MPG) and can vary between different makes and models of cars. For example, a Skoda Octavia achieves around 67.3 mpg, while a Land Rover Discovery or Mercedes S500 gets only about 26-27 mpg. A car with higher fuel efficiency will generally cost less per mile to run than one with poor fuel efficiency. Fixing a serious maintenance issue, such as a faulty oxygen sensor, can improve your mileage by up to 40%, while proper tuning of your engine can improve mileage by an average of 4%.
Engine Size
Cars with larger engines will generally have a higher cost per mile than those with smaller engines. This is because larger engines consume more fuel, even if the car has a higher MPG rating.
Type of Petrol
The type of petrol used can also impact the cost per mile. For example, liquefied petroleum gas (LPG) has an MPG that is 20% lower than petrol due to its lower volumetric energy density.
Distance Travelled
The cost of petrol per mile can also vary depending on the distance travelled. Over longer distances, the cost of fuel may be a smaller proportion of the overall cost of the journey. Additionally, the price of fuel may fluctuate depending on the location, with petrol stations in some areas charging higher prices than those in other areas.
Other Factors
There are also other factors that can impact the cost of fuel per mile. These include the weight of the car, with heavier cars consuming slightly more fuel, and the use of accessories such as ornaments and ground effects kits, which can increase drag and fuel consumption.
To calculate the exact cost of fuel per mile for a specific journey, one can use a fuel cost calculator, which takes into account factors such as distance, fuel efficiency, and the price of fuel.
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Route planning
Real-Time Traffic Updates
Real-time traffic updates are essential for fuel-efficient route planning. By tapping into live traffic data, you can identify areas of congestion, accidents, and road closures. This information helps in recalculating your route and suggesting alternative paths to avoid traffic congestion. Avoiding stop-and-go traffic not only reduces travel time but also fuel consumption, as the vehicle doesn't have to constantly accelerate and decelerate.
Elevation Analysis
Incorporating road elevation data into your route planning can significantly impact fuel efficiency. A comprehensive fuel-efficient route planner will take into account the terrain you will encounter, ensuring a more sustainable and cost-effective journey.
Comprehensive Approach to Route Planning
Fuel efficiency is not just about taking the shortest path but also navigating routes that consider multiple factors. In addition to traffic congestion, factors such as road conditions and elevation changes play a crucial role in optimising your route. Personalised preferences, such as vehicle type, fuel efficiency, and preferred speed ranges, can also be taken into account to create a customised and user-centric experience.
Other Considerations
In addition to route planning, there are other factors that can help reduce fuel costs:
- Drive a smaller car: Smaller cars are more fuel-efficient, with fuel costs for a small sedan being about half that of a large SUV.
- Maintain proper tyre pressure: Properly inflated tyres can reduce fuel consumption by up to 3%.
- Fix maintenance issues: Addressing serious maintenance problems, such as a faulty oxygen sensor, can improve mileage significantly.
- Remove unnecessary accessories: Accessories like spoilers and ground effects kits increase drag and fuel consumption.
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Frequently asked questions
The cost of petrol per mile depends on several factors, including the car's fuel efficiency, engine size, and the type of petrol used. For example, a car with a larger engine or lower fuel efficiency will incur a higher cost per mile. As of 2024, the average cost of ultra-low sulphur unleaded petrol in the UK is around £1.48 per litre, which equates to a cost per mile of approximately 15p-20p for a car with average fuel efficiency (36 mpg).
To calculate the cost of fuel per mile for your petrol car, you need to know your car's miles per gallon (MPG), which can usually be found in the car's manual or online. You also need to find the current price of petrol per litre, which can be found at local petrol stations or through online resources. Then, you can use a formula to convert the litre cost to a gallon cost and determine the cost per mile. Alternatively, you can use a fuel cost calculator or a mobile app, such as Roadtrip, which can provide more accurate and tailored information.
The fuel efficiency of your car has a significant impact on the cost of fuel per mile. Cars with better fuel efficiency will generally have a lower cost per mile. For example, a car that achieves 55 mpg will cost around £676 per year in petrol, while a car that gets 25 mpg will cost the driver £1,488 per year.
There are several ways to reduce the cost of fuel per mile. Firstly, consider the size and efficiency of your car. Smaller cars with more efficient engines will generally have lower fuel costs. Maintaining your car properly and ensuring correct tyre pressure can also improve fuel efficiency. Additionally, planning your route efficiently, utilising public transportation or car-sharing, and reducing unnecessary weight and drag can all contribute to lowering the cost of fuel per mile.
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