UK fuel prices: compare nearby pumps and count the detour cost

B& Business & Money Desk 2026-10-07 11:44 5 min read

A cheaper pump reduces your fuel bill only if the saving outweighs the cost of reaching it. For UK drivers comparing nearby forecourts, the useful number is the saving on the litres you intend to buy, minus any extra driving costs. Check the same fuel grade, available price-update information and the route before setting off.

By Rare Content editorial team. Published by Rare Content.

The government’s Fuel Finder brings together live retail fuel prices and forecourt information across the UK. The official Fuel Finder collection provides current service information. Use it as your starting point, then assess whether a cheaper stop fits the journey you actually need to make.

Compare the same fuel grade at convenient stations

Start with stations along your usual route or close to your destination. A forecourt you already pass can offer a useful saving without adding much distance. A lower advertised price several miles away needs a separate calculation.

Make sure each price is for the fuel you intend to use. Compare petrol with petrol and diesel with diesel, then match the specific grade. A premium product and a standard product are different purchases, so comparing their prices does not establish which station offers the better like-for-like deal.

Use the fuel specification suitable for your vehicle. If you are uncertain, check the handbook or the manufacturer’s guidance before making price the deciding factor.

Read any conditions attached to the displayed price. Where a discount requires membership, a voucher or another purchase, use the price you would actually qualify to pay. Spending extra solely to unlock a small fuel discount can undermine the saving.

Check how recently the price was updated

Look for any available timestamp or update information alongside the price. A recent figure is more useful for a same-day decision than one whose age is unclear. If the service you use provides no update details, treat that as uncertainty when deciding whether a special trip is worthwhile.

Fuel Finder brings together live information, but that does not make an individual price a promise about what you will pay when you arrive. Check the forecourt’s displayed price and the pump price before dispensing fuel.

Check the station details too: its location, opening information and whether your intended grade is listed. If a missing detail could waste the trip, confirm it with the station where practical. A small potential saving gives you little room for an unsuccessful journey.

Calculate the saving on the litres you will buy

The basic calculation is straightforward:

Saving before extra travel = price difference per litre × litres purchased.

When the price difference is expressed in pence, divide the result by 100 to convert it into pounds. Use your intended purchase volume rather than your tank’s full capacity unless you actually expect to buy that amount.

Here is an explicitly hypothetical example: one station charges 5p less per litre than another for the same fuel grade. Buying 40 litres at the cheaper station saves £2 before extra driving costs: 5p multiplied by 40 equals 200p.

The following figures are illustrative calculations, not current pump prices or promised savings. Every row uses the same 40-litre purchase.

Purchase size changes the result. At a hypothetical 5p difference, a 20-litre top-up saves £1 before travel costs. That gives a dedicated detour a smaller budget than the 40-litre example. Buying more fuel increases the calculated saving, but also requires a larger payment at the till.

Count the extra journey, including the return route

Measure the additional distance compared with the trip you would otherwise make. The distance from your home to the cheaper forecourt is not necessarily the detour: you might already be travelling past it, or you might need to drive there and back solely to refuel.

For a simple estimate, use:

Extra fuel cost = additional miles ÷ estimated miles per litre × assumed fuel price in pounds per litre.

If you normally use miles per gallon, convert UK imperial mpg to miles per litre by dividing by approximately 4.546. Use a realistic consumption estimate for the journey rather than assuming your vehicle will achieve its best advertised figure.

A hypothetical detour can absorb most of £2

Suppose the cheaper pump saves £2 on your planned 40 litres, but reaching it adds eight miles. Assume, purely for illustration, that your car travels 10 miles per litre and the extra fuel costs £1.50 per litre.

The additional driving uses an estimated 0.8 litres, costing £1.20. Your estimated saving after that extra fuel cost is therefore £0.80. These assumed figures are not today’s fuel price or a prediction of your vehicle’s consumption.

That remaining 80p excludes your time, vehicle wear and any parking or road charges. You do not need to assign a precise price to every minute to decide that a lengthy diversion offers little benefit. Queues and stop-start traffic can also change the calculation.

Combine refuelling with a journey you already need

A cheaper forecourt may become worthwhile when it fits a shopping trip, commute or other planned journey. Recalculate the extra distance against that route. Do not count the whole journey as a fuel-saving expense if you would make it anyway.

Conversely, do not treat a station as effectively free to reach just because it is near a destination. An awkward entrance, a diversion to the correct carriageway or a return loop can add distance. Compare actual routes rather than straight-line distances.

Make these checks before you drive

Before choosing a stop, run through a short checklist:

• Match the fuel type and grade at both stations.
• Check available price timestamps and any discount conditions.
• Estimate the litres you will actually buy.
• Calculate the saving before travel, then subtract estimated extra fuel costs.
• Check the additional route, opening information and any relevant charges.
• Decide whether the remaining saving justifies the extra time.

Make the comparison while parked, and keep enough fuel available to reach a suitable station. A marginal discount is less useful if it leaves you dependent on one distant forecourt.

For your next fill-up, start with the official Fuel Finder collection, compare suitable stops on your intended route and check the pump price on arrival. The best-value stop is the one that reduces the total cost of your actual purchase and journey.

Source: GOV.UK

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Source check How the savings are calculated

Fuel Finder service information comes from GOV.UK; the savings and detour examples use explicitly hypothetical figures rather than current pump prices.

Checks

• Compare the same fuel type and grade.
• Check available price-update information.
• Multiply the price difference by the intended litres purchased.
• Subtract estimated costs for additional driving.

Source

• GOV.UK

GOV.UK Fuel Finder collection Check facts

Source

GOV.UK Fuel Finder collection

Scope

United Kingdom

Updated

2026-10-07 11:44

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