Weekly UK averages
Government weekly road-fuel price statistics offer a broad national benchmark for petrol and diesel. They are useful for budgeting, comparing broad price trends and estimating journeys before you know which forecourt you will use. They cannot tell you whether a specific station is cheaper today.
Reported local prices
A postcode price finder may use reported forecourt prices. These can be more useful when you are choosing where to stop, but feeds can be delayed, incomplete or corrected later. A visible report is not a guarantee of the pump price when you arrive. Check the fuel grade, postcode and last-updated information where available.
Use the actual price for detailed calculations
If you know what you paid, enter the pence-per-litre from your receipt. If not, use a clear assumption. Journey cost equals miles divided by UK MPG, multiplied by 4.54609 litres and the price in pounds per litre. That estimate excludes parking, tolls and wear unless you add them.
Avoid chasing small savings
A pump that is 3p per litre cheaper saves £1.20 on a 40-litre fill before any detour. Driving additional miles to reach it may erase much of that saving. Compare net cost after the extra journey rather than selecting the lowest displayed pence value automatically.
Keep the numbers in context
Rapid changes in wholesale prices, regional competition, motorway-service premiums and fuel grade can all widen the gap between published average and actual prices. For a fair comparison, align the price date and fuel type. Update estimates when travel dates or routes change.
Questions people ask
Are nearby petrol prices guaranteed?
No. Treat them as reported prices and check the actual display at the station before filling.
Which price should I use for a journey next week?
The latest available UK average is a practical baseline, but it is not a forecast. Update the calculation close to departure.
Check the official source
For current definitions and values, check the primary UK reference. Rules, rates and data sources can change after this guide was published.