Most fuel-saving advice is a long list of small things. The UK price data says something blunter: the biggest single lever is where you fill up, and everything else is a rounding error next to it. When we measured E10 across the roughly 3,900 UK stations we track on 16 August 2026, the mean was 160.4p per litre — but individual stations ran from 124.1p to 186.9p. That is more than 60p between the cheapest and dearest forecourt in the country on the same day.

1. Know Which Brands Run Cheap Near You

Brand is the most reliable shortcut to a lower price. On our data the mean E10 price by brand ran like this: Sainsbury’s 152.9p, Morrisons 159.3p, Jet 159.6p, Asda 159.9p, Shell 161.4p, Esso 161.6p and BP 162.0p. The three supermarkets all came in below Shell, Esso and BP — a spread of about 2 to 9p — but Jet, an oil-company brand, undercut Asda. The supermarket rule of thumb holds on average and breaks on individual brands.

Read that as a tendency, not a guarantee. It is our own measurement across the stations we cover, and a well-placed independent can beat any of these on any given day. The practical version is simple: if a supermarket forecourt is on a route you already drive, make it your default and check the exceptions rather than the rule.

2. Use Fuel Finder Data Before You Drive

Since the Fuel Finder scheme came in, comparison is no longer guesswork. The scheme places a mandatory obligation on all petrol filling stations in the United Kingdom to submit their pricing data, and requires them to report prices within 30 minutes of any change. The government estimates it will save households who own a car an average of £40 a year, and around 90% of stations were signed up as of its March 2026 factsheet, with the Competition and Markets Authority holding enforcement powers over the rest.

The data is published for developers to use, which is why it turns up in a range of apps and comparison sites rather than one official map. Whichever tool you use, the habit is what matters: check before you leave, not once you are already at the pump. If a price looks wrong when you arrive, the government runs a reporting route for exactly that case.

3. Treat Motorway Services as a Last Resort

We identified 42 motorway-type stations in our data using name and address heuristics — operators such as Moto, Roadchef and Welcome Break, addresses containing ‘Services’, and the M1, M4, M5, M6 and M25. Across that small sample, E10 averaged 175.4p against 160.3p elsewhere, and diesel 197.2p against 184.0p. On a 50-litre petrol fill that difference is around £7.50 for the convenience of not leaving the motorway.

The sample is small and the classification is a heuristic, so treat the gap as indicative rather than exact. The behaviour it suggests is not controversial: leave the motorway to refuel where you reasonably can. Our motorway fuel prices guide goes into how to plan that without adding half an hour to a journey.

4. Do Not Pay for a Grade You Do Not Need

Super unleaded averaged 177.9p in our data against 160.4p for standard E10. GOV.UK notes E10 may reduce fuel economy by around 1%, which does not come close to closing a 17p gap. If your vehicle is E10-compatible — around 95% of petrol vehicles on the road are, and all cars made since 2011 — the standard grade is what your engine was specified for. Check yours with the free E10 vehicle checker, and see our E10 vs E5 super comparison for the cases where the premium grade is genuinely required.

5. Understand What You Cannot Change

A large share of the pump price is fixed by tax and is identical at every forecourt in the country. Fuel duty on unleaded petrol is 52.95p per litre until 31 December 2026, rising to 55.95p from 1 January 2027 and 57.95p from 1 March 2027 under the published rates, with final figures to be confirmed at Budget 2026. Diesel carries the same headline rate, and VAT — the UK standard rate of 20% — applies on top.

The consequence is worth internalising: because tax is constant, every penny of difference between two stations comes from retailer margin and local competition. That is the part shopping around actually reaches.

6. Let Loyalty Schemes Be the Tie-Breaker, Not the Decision

Forecourt loyalty schemes are real money, but they operate at a smaller scale than the brand spread above. A scheme returning a few pence per litre in points does not rescue a station priced 9p above the supermarket down the road. Use schemes to choose between forecourts that are already close on price — our UK fuel loyalty schemes guide breaks down how each one actually works.

7. Habits That Cost Nothing

GOV.UK, discussing E10’s roughly 1% economy penalty, points out that driving style, driving with under-inflated tyres and driving with a roof rack all have a much more significant impact on fuel economy. That is a useful ranking from an official source: the free changes — correct tyre pressures, taking the roof box off when you are not using it, and a gentler right foot — plausibly outweigh the fuel-grade decision people agonise over.

Where to Start Locally

Prices are local, so start local. We track city-level pricing across London, Manchester, Birmingham, Leeds and Glasgow, among others, and our regional guides cover England, Scotland, Wales and Northern Ireland. Always check the source timestamp on a price before you rely on it.