How to compare local petrol and diesel prices in the UK

Business & Money Desk 2026-10-09 08:30 Updated: 09:07 4 min read

Petrol pump in the UK with a yellow out of use sign attached.

A lower pump price can cut the cost of a fill-up, but a long detour may use up the saving. Compare nearby petrol or diesel prices with the extra distance, your vehicle’s fuel efficiency and how much you plan to buy before choosing where to stop.

Check local prices before setting off

Use a local fuel-price comparison service or app to look for stations near your route, then check that it lists the fuel your vehicle uses. Prices can differ between forecourts close to one another, and a petrol price cannot be compared directly with a diesel price.

Treat a displayed price as a guide, not a guarantee. The price may have changed since it was reported, and some services may have more recent information than others. Check the time or date attached to the listing, and look for a more recent confirmation if the figure is important to your decision.

The Department for Energy Security and Net Zero publishes official UK road fuel price statistics. These are useful for understanding broader price patterns, but national statistics do not tell you what a particular forecourt is charging now. The Competition and Markets Authority also publishes information about fuel prices and the market. For a specific fill-up, use current local information and verify the timestamp.

Work out whether a detour pays

The useful comparison is the saving at the pump minus the fuel cost of reaching the cheaper station. Estimate the extra round-trip distance, then use your car’s approximate fuel consumption to work out how much fuel the detour would use.

For example, suppose a station is 10 miles farther away for a round trip, your car averages 40 miles per UK gallon, and the fuel price is £1.50 per litre. The detour would use about 0.25 gallons, or 1.1 litres, costing roughly £1.65. These are illustrative figures: your vehicle, traffic and route will change the result.

How to compare local petrol and diesel prices in the UK

If the cheaper station is 3p per litre less, a 40-litre fill saves £1.20 at the pump. In this example, that saving would not cover the estimated £1.65 detour fuel cost. A larger fill, a bigger price gap or a shorter diversion could change the calculation.

A quick way to compare options is:

Note the price difference per litre.
Multiply it by the litres you expect to buy to estimate the pump saving.
Estimate the extra distance for the full detour, including the return to your route.
Estimate the fuel used on that distance and multiply by the price per litre.
Compare the pump saving with the detour cost.

If the saving is only a few pence, a station already on your route will often be the more practical choice. Consider extra time and traffic as well as fuel: a small cash saving may not make a longer or less convenient journey worthwhile.

Match the calculation to your fill-up

The amount you buy matters. A small price difference can add up over a nearly empty tank, but produce little saving when you only need a few litres. Use the amount you actually expect to purchase, not your tank’s full capacity, unless you are planning to fill it.

Vehicle efficiency matters too. A car that uses more fuel will spend more getting to a distant forecourt. Use a realistic figure for your own driving rather than assuming the manufacturer’s best-case figure: stop-start traffic, speed, load and driving conditions can affect consumption.

Also compare like with like. Check that both prices are for the correct fuel grade, and include the complete extra journey. A station that appears close on a map may require a return trip, a route diversion or time in traffic.

Check the timestamp and local context

Fuel-price listings can become outdated when a forecourt changes its price. Look for when the figure was last checked or reported, and be cautious if that time is missing or unclear. If a substantial detour depends on a small price gap, confirm the price as close to your journey as possible.

Official UK road fuel statistics provide a wider view of the market; they are not a live quote for your local pump. Local listings help with the immediate comparison, while official statistics and Competition and Markets Authority information offer broader context. Neither removes the need to check whether a specific price is current.

Before leaving, compare two or three plausible stations along the route, confirm the fuel type and timestamp, then weigh the likely saving against the extra miles. Recheck if the price information is old, the journey has changed or the cheapest option requires a meaningful detour.

Source: Department for Energy Security and Net Zero

Context & actions About this article

Source check Price-checking note

The guide distinguishes live local forecourt listings from broader official statistics and uses illustrative figures to show how to compare a pump saving with detour fuel cost.

Checks