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UK Fuel Cost Comparison

Today is Sunday 11th January 2026

Fuel Cost Comparison

Average Prices for January 2026
1. Combustion & Hybrid
Average fuel efficiency when charged regularly.
2. Electric Charging
Final math includes a 10% charging loss buffer.

Disclaimer: Fuel and energy costs shown are estimates based on your inputs, industry averages, and published price data. EV calculations include assumed charging efficiency losses and do not reflect individual driving behaviour or vehicle condition. Actual costs may vary materially. ChangeCar.com accepts no responsibility for reliance on these estimates. You must independently verify costs before making decisions.



Petrol, Diesel, or Electric: Which Fuel Type Saves You More?

With energy prices and fuel costs constantly shifting, choosing the right engine type has never been more critical for your wallet. Whether you are a high-mileage motorway cruiser or a city-based commuter, the "pump price" is only half the story.

Our Fuel Cost Comparison Calculator is designed to cut through the confusion. By inputting your real-world annual mileage and MPG, you can see a side-by-side breakdown of what you'll actually spend over the next 12 months. This allows you to make a data-driven decision when choosing your next vehicle.

The True Cost Per Mile

When comparing fuels in the UK, it's helpful to look at the specific strengths and weaknesses of each powertrain based on how you drive:

Petrol Efficiency

Best for low-mileage drivers or city trips. Modern turbo-petrol engines are efficient, but their cost per mile can rise quickly on long commutes.

The Diesel Gap

Diesel often costs more at the pump, but higher MPG usually makes it cheaper for those driving 12,000+ miles per year on motorways.

Electric (EV) Savings

Electricity is measured in kWh. If you charge at home on an off-peak tariff, your "fuel" costs can be up to 70% lower than petrol.

What Affects Your Fuel Economy?

In the UK, several factors can drastically change the figures you see in the calculator above:

  • The UK Gallon: Remember that UK fuel economy is calculated using Imperial Gallons (4.546 litres), which is different from the US Gallon used in many online apps.
  • Seasonal Changes: EVs typically lose some efficiency in cold UK winters, while petrol/diesel cars use more fuel during short trips when the engine hasn't warmed up.
  • Tyre Pressure & Weight: Under-inflated tyres or carrying extra roof racks can reduce your MPG by up to 10%, regardless of your fuel type.
  • Driving Style: Smooth acceleration and using "Eco" modes can bridge the gap between a thirsty car and an affordable one.

How to Use Your Results

If the calculator shows a saving of more than £500 per year by switching fuels, it may be worth considering the upfront cost of a new vehicle. For many, the monthly savings on fuel can help offset a slightly higher monthly finance payment (PCP or HP), effectively "self-funding" a car upgrade.

Analyze Before You Buy

Knowledge is power. Before committing to your next car, use these figures to ensure your choice fits your lifestyle. A cheaper car with poor fuel economy can often end up costing you more over a 3-year term than a premium, high-efficiency alternative.