How to Compare UK Petrol Prices With the National Average

A UK national fuel-price average is a useful benchmark, but it does not tell you what a nearby forecourt charges today. Compare the same fuel type, check the dates and locations, and use your vehicle’s fuel economy to estimate whether a cheaper stop could save money on your journey.

Find the latest official UK fuel-price data

The Department for Energy Security and Net Zero publishes weekly road fuel price data through its road fuel and petroleum prices collection. Check the latest publication and note its reporting date before using a figure. The collection is the source for official national data; the supplied source information does not state the latest petrol or diesel figures, so no price is quoted here.

A weekly average summarises prices across the UK for the reporting period. It is not a live quote, a forecast, or a price you should expect at every station. Pump prices can change between publication periods, and individual forecourts can differ from the national figure.

Compare local stations like for like

For a useful comparison, make sure you are checking the same fuel and a similar time period:

• Compare petrol with petrol and diesel with diesel. Do not use one fuel’s average to judge the other.
• Check when the station price was last updated, if that information is available, and compare it with the official data’s reporting date.
• Compare stations in the area you would actually use. Prices may vary by location, and supermarket and motorway forecourts may differ.
• Check the price per litre and any extra distance or time needed to reach a cheaper station.

The gap between a local price and the weekly national average is a reference point, not proof that one station is unusually expensive or cheap. A local price could have changed since it was recorded, while the official average covers a broader set of prices and dates.

Estimate the fuel cost of a trip

Use distance and your vehicle’s real-world fuel economy to estimate how many litres a journey needs. If your vehicle’s dashboard or trip records show litres per 100 kilometres, convert the distance to kilometres, multiply by that figure, then divide by 100. Multiply the litres used by the price per litre to get an approximate fuel cost.

For example, suppose a hypothetical 100-mile trip uses 6 litres per 100 kilometres, and the fuel you buy costs £1.50 per litre. One hundred miles is about 161 kilometres, so the estimate is about 9.7 litres, or roughly £14.55. These are example inputs, not current UK fuel prices. Actual consumption can differ with traffic, speed, weather, vehicle load and driving style.

If you are comparing a cheaper station that requires a detour, include the fuel used for the extra distance too. A lower price per litre may not reduce the total trip cost if getting to that pump adds enough mileage.

What the national average can and cannot show

The official weekly series helps put a dated local quote in context and compare broad changes over time. It cannot confirm a station’s current pump price or predict what you will pay on a particular route. Supermarket and motorway locations may have different prices, and conditions can change after the reporting period.

Before setting off, check a recent price for the specific forecourt where possible. For a fair comparison, record the fuel type, location and date alongside the national figure, then use your own vehicle’s typical efficiency to judge the likely trip cost.

Source: UK Department for Energy Security and Net Zero