
Fuel costs are an important consideration for any journey, and with fuel prices on the rise, it is becoming increasingly important to find ways to improve your vehicle’s fuel efficiency. Luckily, there are now many fuel cost calculators available to help you work out how much fuel you will use and how much it will cost. These calculators take into account factors such as the distance travelled, the price per litre of fuel, your vehicle's MPG (miles per gallon), and your average speed throughout the journey. By using these tools, you can better budget for your fuel costs and make more informed decisions about your journeys.
| Characteristics | Values |
|---|---|
| Calculating fuel cost | Use a fuel cost calculator by inputting the price per litre of fuel, the vehicle's MPG, and the distance travelled |
| Improving fuel efficiency | Remove unnecessary items from the boot, use cruise control, and drive at steady speeds |
| Fuel cost apps | Roadtrip, Fuel Cost Calculator, Petrol Calculator, and Getroadtrip |
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What You'll Learn

Fuel cost calculators
RAC Fuel Cost and Mileage Calculator
The RAC Fuel Cost and Mileage Calculator can be used to calculate the fuel cost of a journey and your business mileage along any route in the UK. It uses wholesale and retail fuel prices to ensure that the calculations are based on the latest average petrol and diesel prices. To use the calculator, you need to input your current location and your destination. The calculator will then display the driving distance and time, as well as your fuel usage, fuel cost, and mileage rate.
Fleet News Fuel Cost Calculator
The Fleet News Fuel Cost Calculator can be used to calculate the cost of fuel for your journey based on fuel price and vehicle data. It requires you to select the fuel type, input your mileage, and provide the mpg rate or select your vehicle's make and model. The calculator is updated every month with the latest fuel price data.
Fuel-Economy.co.uk Petrol Calculator
The Fuel-Economy.co.uk website also offers a petrol calculator at Petrol-Calculator.co.uk. This calculator can be used to determine how much fuel you will need for a given journey. It requires you to input the distance of your journey in miles and the estimated MPG of your vehicle. You can also use the calculator to work out your actual MPG by providing the cost of the fuel, the amount of fuel purchased, and the distance covered.
FuelCostCalculator.uk
The FuelCostCalculator.uk website offers a simple formula to calculate the cost of fuel for your journey: (cost per litre x distance) ÷ vehicle MPG x 4.546. It also provides a calculator that requires you to input the price per litre of fuel, your vehicle's MPG, and the distance you intend to drive.
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Improving fuel efficiency
Tyre Pressure
Tyre pressure plays a vital role in fuel efficiency. Underinflated tyres create more rolling resistance, forcing your engine to work harder and burn more fuel to maintain speed. Overinflated tyres, on the other hand, reduce traction and increase uneven tyre wear. Regularly checking and maintaining the correct tyre pressure ensures optimal contact with the road, improving both fuel efficiency and safety. Always check your tyre pressure before long journeys and as specified in your car’s manual.
Remove Unnecessary Weight
Extra weight in your car requires more energy from the engine to move, increasing fuel consumption. For every 50kg of extra weight, your car’s fuel consumption can increase by approximately 2%. Remove any unnecessary items from the boot of your car, such as sports equipment or heavy tools that you don't use often. Additionally, remove unused roof racks and roof boxes, as they create aerodynamic drag, making your car less fuel-efficient, especially at higher speeds.
Engine Maintenance
A poorly maintained car consumes more fuel due to inefficiencies in the engine and its components. For example, clogged air filters reduce airflow to the engine, causing it to work harder. Regular servicing ensures that your car is running optimally, with clean filters, properly lubricated components, and correctly aligned wheels, all of which contribute to better fuel economy. It is also recommended to have an oil change every 6 months (depending on the type of oil used) to keep your engine clean and operating at its optimal level.
Driving Habits
Driving habits can significantly impact fuel efficiency. Driving in the wrong gear, such as staying in a low gear at high speeds, can lead to inefficient fuel usage. Using the right gear keeps your engine within its optimal range, improving efficiency and reducing fuel consumption. For petrol engines, shifting gears between 1,500 and 2,500 RPM optimises fuel efficiency, while diesel engines are most efficient between 1,300 and 2,000 RPM. Additionally, accelerating and braking gently and gradually, and reading the road ahead to avoid sharp braking, can improve your vehicle's fuel economy. Driving at steady speeds also helps conserve fuel, as quick acceleration uses up more fuel. Using cruise control can help maintain a constant speed and improve mileage.
Hybrid Vehicles
Upgrading to a hybrid vehicle can be a cost-effective way to reduce fuel consumption in the long term. Hybrid cars use electric power alongside traditional fuel, significantly improving fuel economy. Plug-in hybrids allow you to cover short distances entirely on electric power, further reducing fuel usage. With the electrical switchover looming, transitioning to an electrified vehicle may be a good option.
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Fuel consumption factors
Fuel consumption depends on several factors, and it can be challenging to calculate fuel costs, especially in the UK, where fuel is priced in litres, but most drivers know their fuel consumption in gallons per mile. Here are some essential factors that influence fuel consumption:
Vehicle MPG (Miles Per Gallon)
The miles per gallon rating of a vehicle is a critical factor in determining fuel consumption. MPG indicates how many miles a vehicle can travel per gallon of fuel. A higher MPG rating translates to better fuel efficiency, leading to lower fuel costs over time. When comparing vehicles, choosing one with a higher MPG can result in significant savings.
Distance Travelled
The distance covered during a journey directly impacts fuel consumption. Longer trips will naturally require more fuel than shorter ones. To estimate fuel costs, it is essential to consider the distance travelled, as this value, along with the vehicle's MPG, forms the basis of fuel consumption calculations.
Fuel Price
Fluctuations in fuel prices can significantly affect overall fuel costs. Rising fuel prices can increase the financial burden of a journey, while taking advantage of lower fuel prices can help reduce expenses. Keeping abreast of real-time fuel price information can assist in making informed decisions and budgeting for trips.
Vehicle Load
The weight of the vehicle, including passengers and luggage, can influence fuel consumption. Heavier loads require more fuel to propel the vehicle, leading to increased fuel costs. Removing unnecessary items from the vehicle, such as unused sports equipment or heavy tools, can help improve fuel efficiency.
Driving Speed and Conditions
Driving speed and conditions, such as traffic and terrain, also play a role in fuel consumption. Maintaining steady speeds and utilising cruise control on long drives can enhance fuel efficiency. In contrast, frequent acceleration and deceleration, and navigating through hilly terrain or busy city roads, can increase fuel usage.
Vehicle Maintenance
Proper vehicle maintenance is crucial for optimising fuel efficiency. Regular oil changes, for instance, ensure the engine operates at its optimal level. When engine oil becomes too dirty, it can hinder performance and lead to decreased fuel efficiency. Therefore, adhering to recommended maintenance schedules can help maintain fuel efficiency and control fuel costs.
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Real-time UK fuel prices
The RAC Fuel Watch section of the RAC website and myRAC app provide in-depth insights into fuel pricing in the UK, including the latest data and analysis. The Fuel Finder feature in the app allows users to search within a 2, 5, or 10-mile radius to find the cheapest fuel in their area. RAC Fuel Watch monitors wholesale prices and pump prices daily, covering major supermarkets and other brands, to ensure retailers charge fair prices.
The Confused.com website also provides a map to find UK fuel prices near the user, as well as EV charging points.
Additionally, the UK government publishes weekly road fuel price statistics, providing average UK retail 'pump' prices.
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Fuel cost per journey
Fuel costs are an important consideration when planning a journey. There are various factors that can influence the amount of fuel used and, consequently, the cost of a journey. These include the weight of the vehicle (including passengers and luggage), the average speed throughout the journey, the terrain (driving up and down hills will cost more than driving on level roads), and the type of road (driving on empty motorways will use less fuel than driving through busy city/town roads).
To calculate the cost of fuel for a journey, you can use a simple formula: (cost per litre x distance) ÷ vehicle MPG x 4.546. Alternatively, you can use the distance covered and the vehicle's MPG to calculate the amount of fuel needed for the journey: distance ÷ vehicle MPG x 4.546.
There are also several fuel cost calculators available online and as apps that can help you budget for your journey. These tools often allow you to input the price you are paying per litre of fuel, your vehicle's MPG, and the distance you intend to drive. Some calculators also allow you to select your vehicle's make and model to get personalized fuel cost estimates.
Using these calculators can help you plan your journey and choose the most fuel-efficient route. Additionally, it can help you compare the cost of driving with other transport options, such as public transport, to make the most cost-effective choice.
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Frequently asked questions
You can calculate your fuel consumption by using the formula: (cost per litre x distance) ÷ vehicle MPG x 4.546. You can also use a fuel cost calculator, which will require details such as the price per litre of fuel, your vehicle's MPG, and the distance you intend to drive.
Additional weight, such as passengers and luggage, can impact your fuel efficiency. Other factors include your average speed, terrain, and whether you're driving at a consistent speed or doing a lot of stopping and starting.
Maintaining your vehicle's engine by changing the oil regularly and using cruise control on long drives can help improve fuel efficiency. Removing unnecessary items from your boot and driving at steady speeds can also reduce fuel usage.
Yes, the Roadtrip app provides real-time UK petrol prices and vehicle-specific calculations to help you estimate fuel costs for your trip. It also allows you to split costs easily with friends and optimize your route to find the most fuel-efficient options.
You can use a fuel cost calculator specifically for the UK, such as Neil's Toolbox. These tools will provide a rough estimate of your fuel costs based on your vehicle's fuel economy (MPG) and the distance travelled.











































