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Supermarket vs Branded Petrol: How Much Can You Save in 2026?

PetrolPricesNearYou Editorial

Supermarket vs Branded Petrol: How Much Can You Save in 2026?

With petrol prices elevated following the Iran conflict, where you fill up is more important than ever. The gap between a supermarket forecourt and a branded station can run to over 10p/litre — and the difference between a local forecourt and motorway services is even wider. For drivers filling up regularly, the choice of station is worth hundreds of pounds a year.

The Price Gap in Numbers

Supermarket petrol is on average 6.2p/litre cheaper than branded petrol in 2026. At a UK average petrol price of approximately 152.9p/litre in March 2026, the supermarket average of around 146.7p represented a saving of 6.2p per litre — worth £3.41 on a 55-litre fill. A driver filling up twice a week could save over £350 annually simply by switching from a branded station to a supermarket forecourt.

The gap widens further when comparing against premium branded sites. Branded stations such as BP, Shell and Esso averaged 157.2p/litre during the March 2026 price spike — a 10.5p premium over supermarkets that amounts to approximately £577 per year extra for a driver covering 10,000 miles at 40 MPG.

Motorway services are in a category of their own. The gap between the cheapest supermarket forecourt (Asda at 143.9p/litre) and motorway services (averaging 173.4p/litre) reached 29.5p per litre — meaning drivers who routinely fill at motorway services pay approximately £840 per year more than those who consistently use supermarket forecourts.

Why the Gap Exists

The structural reason is straightforward. Supermarkets use fuel as a loss-leader: fuel is a powerful tool to drive footfall into the store, so their forecourt margins are kept deliberately tight. The major brands — BP, Shell, Esso and Texaco — need to generate profit from fuel sales themselves, which means building a higher margin into their pump prices.

All four supermarkets source fuel from shared UK refineries and distribution networks. The base product is identical — the same crude-oil derivative meeting the same BS EN 228 standard — so quality is not a reason to pay more at a branded site for standard unleaded or diesel.

The spread across the whole UK market is striking. On any given day, the cheapest unleaded in the UK sells for roughly 125–128p/litre, while the most expensive (excluding motorway services) reaches 155–160p/litre. That's a 30p-plus spread, or about £15 on a 50-litre tank. Even within a single town, price variation of 10–15p per litre is common.

Which Supermarket Is Cheapest?

Asda is typically the most aggressive price-cutter among the big four, undercutting the national average by 4–7p/litre on average. However, individual station prices vary — the cheapest supermarket overall may not be the cheapest near you — so the only reliable way to find the actual lowest price is to check live forecourt data before you leave.

Supermarket stations are expected to remain competitive throughout 2026, but price behaviour continues to depend on local competition, volume sold, and individual site strategy rather than brand name alone. Drivers should expect continued variation even among supermarket forecourts.

What This Means for Drivers

Pump prices remain elevated in May 2026 following the Iran conflict's impact on global crude. Supermarket forecourts are expected to lead any price falls through May and June as wholesale costs ease, with prices potentially returning to the low 140s by summer if geopolitical conditions improve. That makes supermarkets doubly attractive right now — cheaper today, and faster to pass on cuts tomorrow.

The practical upshot: if you're currently filling up at a BP, Shell or Esso forecourt out of habit, switching to your nearest supermarket is the single highest-impact fuel-saving action available to you.

How to Save on Fuel

  • Always check live prices before you fill up. Use petrolpricesnearyou.com to compare every forecourt near you in real time — data is sourced from the official UK Government Fuel Finder and refreshed every 30 minutes. The cheapest station in your town isn't always the one you expect.
  • Avoid motorway services for fuel. The CMA found that motorway service stations, operating with a captive audience and no local competition, consistently charge 15–25p above the nearest town. Fill up at a supermarket before joining the motorway rather than on it.
  • Factor in loyalty rewards. Tesco Clubcard and Sainsbury's Nectar both offer points on fuel purchases. For drivers who shop regularly at either chain, the effective price per litre after points can undercut even Asda's headline rate on a given week.

Sources

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