Below expected range
The source price remains visible, but cannot make a station or area look artificially cheap.
Visible, not compared
Fuel price data accuracy
We preserve the price a forecourt reports, check it against clear market rules and stop unusual values from distorting comparisons. We also explain what those checks can and cannot confirm.
- Forecourts tracked
- 8,229
- Qualifying prices
- 26,366
Live methodology
Today’s qualifying price ranges
This is the page’s live evidence panel. After every successful Fuel Finder update, each reported price is checked against the current UK median for the same fuel.
Petrol
Petrol: the current UK median is 173.9p per litre, so a reported price qualifies for comparisons between 138.9p and 233.9p per litre.
Diesel
Diesel: the current UK median is 199.9p per litre, so a reported price qualifies for comparisons between 164.9p and 259.9p per litre.
Super unleaded
Super unleaded: the current UK median is 192.9p per litre, so a reported price qualifies for comparisons between 157.9p and 252.9p per litre.
Premium diesel
Premium diesel: the current UK median is 219.9p per litre, so a reported price qualifies for comparisons between 184.9p and 279.9p per litre.
Unusually low
- Absolute floor
- 80p
- Below median
- 35p
A price is marked unusually low when it is below 80p per litre, or more than 35p below the current UK median for that fuel.
Unusually high
- Absolute ceiling
- 300p
- Above median
- 60p
A price is marked unusually high when it is above 300p per litre, or more than 60p above the current UK median for that fuel.
How the UK median is calculated
The median uses one latest reported price for each forecourt and fuel that falls within the absolute 80p to 300p range. Each forecourt contributes at most one price for a fuel.
From report to comparison
How a price becomes comparison ready
We never silently correct the source amount. We classify it, publish the outcome and control where the price can be used.
Step 01
Retain the report
We keep the source amount and reported time intact for each public forecourt and fuel.
Step 02
Check the range
The price is tested against the fixed outer limits and current UK median for that fuel.
Step 03
Publish the outcome
Qualifying prices power comparisons. Unusual prices stay visible with a clear warning.
Published outcomes
One status decides how the price is used
All three outcomes are transparent. Only a qualifying price can influence the comparisons drivers use to decide where to fill up.
Valid price
Within expected range
The reported price is eligible for averages, rankings and savings comparisons.
- National, regional and town averages
- Cheapest-price rankings
- Station and market comparisons
- Daily comparison averages
Comparison eligible
Above expected range
The source price remains visible, but cannot inflate averages or savings comparisons.
Visible, not compared
An honest boundary
What the checks can and cannot confirm
The range check protects PetrolDiesel comparisons. It is a quality safeguard, not independent proof of the price displayed at a forecourt.
Before you buy
A believable-looking price can still be late or incorrect. Check the price displayed at the forecourt before filling up, especially before making a special journey.
Official Fuel Finder guidance says price data can be delayed. Read the UK Government Fuel Finder guidance.
Methodology maintained by PetrolDiesel.co.uk. Last reviewed .
- VisibilityThe source amount stays visibleAn unusual price is not changed or deleted. Forecourt pages show the reported amount with its quality warning.
- ComparisonsComparisons use qualifying pricesUnusual prices stay outside averages, rankings, market comparisons and per-tank savings calculations.
- HistoryHistory keeps the classificationThe latest daily price is stored with its quality status. Unusual values remain visible, but outside that day’s averages.
- FreshnessTimestamps show the price’s ageA current report remains in place until Fuel Finder supplies a replacement, so the reported time matters.
Savings methodology
How we calculate a per-tank difference
Across PetrolDiesel, we convert a pence-per-litre gap between comparison prices into an illustrative 55-litre tank amount.
The formula
price gap in pence × 55 ÷ 100
Worked example
Price gap
5p
Cheaper price vs benchmark
Tank size
55 litres
Fixed comparison size
Difference per tank
£2.75
5p × 55 ÷ 100 = £2.75
Illustrative example, not a live price claim.
We use the absolute gap between the two prices being compared, multiply it by 55 litres, then convert pence to pounds. This can compare the cheapest station with an area average, the cheapest with the most expensive, or one market group with another.
The wording follows the evidence. We call it a saving only when the selected option is genuinely cheaper. If it is dearer, we describe the extra cost. If the prices are effectively level, we do not show a saving.
A 55-litre tank is a consistent comparison size, not an estimate of what every driver buys.
Good to know
Fuel-price accuracy FAQs
Understand unusual values, timestamps and rankings, then follow the right route if something looks wrong.
Does a valid price mean it is definitely correct?
No. Valid price means the report sits within the expected market range and can be used in comparisons. It does not independently confirm the forecourt display. Learn how we source fuel price data.
Do you change a price that looks wrong?
No. We preserve the amount reported through Fuel Finder. If it falls outside the expected market range, we label it as unusual and exclude it from comparisons.
Can an unusual price make a town look cheaper?
No. Unusually low and unusually high prices remain visible on the forecourt page, but they do not enter national, regional or town averages, cheapest-price rankings or savings comparisons.
Do older current prices expire automatically?
No. A retained current price remains current until the source replaces it. Its source timestamp stays visible so drivers can judge its age.
What should I do if a forecourt price looks wrong?
Check the source timestamp and unusual-price label first. If the displayed pump price still differs from the page, you can report a price issue with the forecourt and fuel details.
Built on real fuel-price data
Prices are sourced from the UK Government Fuel Finder scheme. Prices checked 20 Oct 2026, 06:02. how we source fuel price data
- Forecourts tracked
- 8,229
- Qualifying prices
- 26,366
- Locations covered
- 1,003