UK fuel prices: how to judge a local pump price

A difference of 5p per litre adds £2.50 to a 50-litre fill-up. That is a useful way to judge a local petrol or diesel price against the UK weekly average, but the comparison needs a dated figure for the same fuel. The Department for Energy Security and Net Zero publishes those averages in its weekly road fuel prices series.

Start with the dated price for the same fuel

Check the latest published week in the government series and note its petrol and diesel averages in pence per litre. The source information available confirms the weekly series but does not include its latest dated figures. A current average or a claim that prices have risen or fallen therefore cannot be stated here reliably.

Compare petrol with the petrol average and diesel with the diesel average. Keep the date alongside the figure: a price displayed at a forecourt today and a weekly national average describe different points in time. If the latest published week ended before a recent change in pump prices, the gap may partly reflect that timing.

The weekly figures give a UK benchmark. They do not promise that a station near you will charge that amount. Individual forecourts set their own prices, and prices can differ between nearby stations as well as between regions.

Turn a per-litre difference into a tank cost

The table below is an illustration, not a statement of current UK or local prices. It shows how a driver could compare a 150p-per-litre local price with a 145p-per-litre benchmark for the same fuel.

In this example, the local price is 5p per litre higher and the 50-litre fill costs £2.50 more. The calculation is the price difference in pence multiplied by the litres bought, then divided by 100 to give pounds. For a 40-litre fill, the same gap would be £2.00; for 60 litres, it would be £3.00.

Use the amount you expect to buy, rather than assuming every visit is a full tank. A tank’s stated capacity may also differ from the amount needed when you arrive at the pump. The receipt or pump display gives the actual litres purchased and the final cost.

What the UK average can tell you locally

A local price above the weekly average tells you how that posted price compares with the national benchmark for that fuel and date. It does not establish that another nearby station is cheaper. Equally, a price below the average may still be higher than another option on your route.

For a fill-up decision, write down the latest dated government average, check the displayed price for the same fuel at stations you can reasonably use, and calculate the difference for the litres you need. A detour has a cost too, so a small saving at the pump may be outweighed by the extra fuel and time needed to reach it.

The next useful check is the latest dated petrol or diesel figure alongside the prices displayed at the forecourts available to you. That gives the national context and the local choice needed to judge one fill-up.

Source: UK Department for Energy Security and Net Zero