
With fuel prices on the rise, calculating the cost of fuel per mile is crucial for drivers in the UK. Fuel expenses can vary depending on several factors, including a car's fuel efficiency, engine size, and the type of fuel used. To determine the cost per mile, drivers need to know their car's miles per gallon (MPG) and the current price of fuel. This information can be found in the car's manual or online. Using a fuel calculator can help drivers estimate their fuel expenses based on their vehicle's specifications and current fuel prices. With fuel costs impacting budgets for road trips and daily commutes, understanding the cost of fuel per mile is essential for effective financial planning.
| Characteristics | Values |
|---|---|
| Average cost of ultra low sulphur unleaded petrol per litre | £1.48 |
| Average cost of petrol per litre | £1.356 |
| Average cost of diesel per litre | £1.431 |
| Average miles per gallon (MPG) | 36 mpg |
| Cost per mile | 15p-20p |
| Average annual fuel cost for a car driving 5,000 miles | £861 |
| Average annual fuel cost for a car driving 6,000 miles | £676 (at 55 mpg) or £1,488 (at 25 mpg) |
| Average annual fuel cost for a car driving 12,000 miles | £2,067 |
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What You'll Learn

Fuel cost calculators
There are several fuel cost calculators available online, each with its own unique features. Some calculators require you to input your vehicle's fuel efficiency, typically measured in miles per gallon (MPG), which can be found in the car's manual or online. You can then determine the current price of petrol per litre, which can be found at local petrol stations or online. With this information, you can calculate the cost per gallon by multiplying the cost per litre by 4.54609 (the number of litres in a UK gallon). Finally, using the MPG and cost per gallon, you can find the cost per mile.
Alternatively, some calculators, such as the one provided by Fleet News, use fuel price and vehicle data to calculate fuel costs. You can input your vehicle's make and model, fuel type, mileage, and mpg rate. This calculator also provides potential savings on fuel costs and allows you to compare fuel prices across the UK.
The RAC Fuel Cost and Mileage Calculator is another useful tool that helps you calculate the fuel cost of a journey and your business mileage. It allows you to input your starting and ending postcodes to determine the fuel cost for a specific route.
Additionally, Roadtrip is a modern app-based calculator that uses your car's make and model to provide instant calculations of the total cost of your journey, including the cost per mile and the overall journey cost.
These fuel cost calculators are valuable tools for drivers, providing essential insights into fuel expenses and helping them make informed decisions about their travel plans and budgets.
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Fuel efficiency
The cost of petrol per mile varies depending on several factors, including the car's fuel efficiency, engine size, and the type of petrol used. Cars with lower fuel efficiency or larger engines will generally have a higher cost per mile. To calculate the cost of petrol per mile, you need to know your car's miles per gallon (MPG) and the current price of petrol per litre. MPG information can usually be found in the car's manual or online. Petrol prices can be checked at local stations or through online resources.
Various fuel cost calculators are available online and as apps, which can help motorists understand and manage their fuel expenses. These calculators use fuel price, vehicle data, and mileage information to estimate fuel costs for specific journeys or on a weekly, monthly, or annual basis. Motorists can also calculate fuel costs manually, although this can be cumbersome, especially when dealing with different vehicles. The manual calculation involves converting litre cost to gallon cost and then using MPG and cost per gallon to find the cost per mile.
Implementing tips to improve fuel efficiency can significantly reduce overall fuel bills. Newer cars tend to have better fuel efficiency due to technological advancements. Upgrading to a more fuel-efficient vehicle can lead to long-term savings. Additionally, electric vehicles (EVs) are much cheaper to power than petrol or diesel cars, making them a cost-effective alternative.
In summary, understanding fuel efficiency and utilising available tools can help motorists optimise their fuel costs in the face of fluctuating fuel prices in the UK. By making informed choices and adopting fuel-efficient practices, drivers can effectively manage their expenses and reduce their overall fuel expenditure.
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Average fuel prices
The average cost of ultra low sulphur unleaded petrol in the UK is around £1.48 per litre, although this figure can change rapidly due to market and geopolitical influences. For instance, in March 2025, the average price of petrol was £1.356 per litre, while diesel was £1.431 per litre.
The cost of petrol per mile varies significantly depending on factors such as the car's fuel efficiency, engine size, and the type of petrol used. For example, cars with larger engines or lower fuel efficiency will generally have a higher cost per mile.
There are various fuel cost calculators available online, which can help you determine the cost of petrol per mile for your specific vehicle. These calculators take into account factors such as the current price of petrol per litre, your car's fuel efficiency (measured in miles per gallon or MPG), and the distance of your journey.
Using a fuel calculator can be especially helpful if you're looking to budget for a road trip or daily commute, as fuel prices can fluctuate over time. It's worth noting that newer cars tend to have better fuel efficiency, so upgrading to a newer model could potentially save you money in the long run. Additionally, implementing tips to improve your car's fuel efficiency can help reduce your overall fuel costs.
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Fuel economy
One of the key metrics to understand when it comes to fuel economy is miles per gallon (MPG). This metric indicates how many miles a car can travel on a single gallon of fuel. You can usually find this information in your car's manual or online. By knowing your car's MPG, you can calculate the cost per mile based on the current price of petrol per litre.
To improve fuel efficiency and reduce overall fuel costs, it's beneficial to consider vehicles with better fuel economy. For example, a car with excellent fuel efficiency, such as the Skoda Octavia, which achieves around 67.3 mpg, will cost significantly less to run than a car with poor fuel efficiency, like a Land Rover Discovery or Mercedes S500, which only manage around 26-27 mpg. Newer cars also tend to have better fuel efficiency due to technological advancements, so upgrading to a newer model may be a worthwhile investment in the long run.
Additionally, there are various tools available to help you calculate fuel costs and improve fuel economy. Fuel cost calculators, such as those offered by Fleet News and GetRoadTrip, allow you to estimate fuel expenses based on factors like vehicle make and model, mileage, and fuel prices. These calculators can help you budget for future trips and provide insights into potential savings. Furthermore, implementing tips to improve your car's fuel efficiency, such as those suggested by Fuel-Economy.co.uk, can further enhance your fuel economy and reduce fuel bills.
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Advisory fuel rates
AFRs are specifically designed to assist with reimbursements when a company repays an employee for business travel in a company car or when an employee repays the company for personal travel using a company car. It's important to note that these rates only apply to company car users and should not be used in other circumstances.
If your cars are more fuel-efficient, or if the cost of business travel exceeds the guideline rates, you can use your own rates. However, if you pay rates higher than the advisory rates but cannot demonstrate that the fuel cost per mile is higher, any excess will be treated as taxable profit and Class 1 National Insurance earnings.
To calculate the fuel cost per mile for your vehicle, you can use online fuel cost calculators. These tools consider factors such as fuel price, vehicle data, and miles per gallon to provide an estimate of your fuel expenses.
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Frequently asked questions
You can calculate the cost of fuel per mile by determining your car's fuel efficiency (miles per gallon or mpg), finding the current price of petrol per litre, converting the litre cost to a gallon cost, and then calculating the cost per mile using the mpg and cost per gallon.
The average cost of fuel per mile in the UK varies depending on several factors, including the car's fuel efficiency, engine size, and the type of petrol used. For example, cars with larger engines or lower fuel efficiency will generally have a higher cost per mile. As of March 2025, the average cost of petrol was £1.356 per litre, and the average cost of diesel was £1.431 per litre.
You can use a fuel cost calculator, which will take into account the distance of your journey and your vehicle's mpg to estimate the cost of fuel for that journey.
Yes, there are apps available, such as Roadtrip, that can help you track and manage your fuel expenses. These apps use the latest fuel prices and your vehicle's specifications to provide tailored information about your fuel costs.
You can consider improving your car's fuel efficiency by implementing various tips and tricks. Additionally, newer cars tend to have better fuel efficiency due to technological improvements, so upgrading to a newer model may help reduce fuel costs in the long term. Finally, comparing fuel prices and choosing more fuel-efficient vehicles for specific journeys can also help optimise your fuel expenses.





































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