Supermarket vs Branded Fuel — Is There a Difference?

One of the most common questions UK drivers ask: is supermarket fuel — from Asda, Tesco, Sainsbury's and Morrisons — the same quality as fuel from Shell, BP and Esso? The short answer is yes, for standard grades. Here is the full picture.

The Quality Question

All fuel sold in the UK must meet British Standards: EN 228 for petrol and EN 590 for diesel. This applies to every forecourt regardless of brand. Supermarket fuel comes from the same refineries (Fawley, Stanlow, Grangemouth, Lindsey) and travels through the same pipeline and distribution network as branded fuel.

When a tanker delivers fuel to a supermarket forecourt, it is the same base product that goes to Shell or BP. The difference is what happens after delivery: branded stations may add their own proprietary additive packages at the terminal or in the tanker.

Where Branded Fuels Differ

The real difference between supermarket and branded fuel is in the premium grades. Shell V-Power, BP Ultimate and Esso Synergy Supreme contain higher concentrations of detergent additives, friction modifiers, and (for petrol) higher octane ratings. These can provide genuine, if modest, benefits: cleaner injectors, slightly smoother combustion, and marginally better performance.

However, these premium products cost 15 to 20 pence more per litre. For most everyday driving, the benefits do not justify the cost. Read our premium diesel guide and E10 vs E5 guide for detailed breakdowns.

The Price Comparison

Supermarket fuel is consistently 5 to 10 pence per litre cheaper than branded stations. Here is how they typically rank:

1. Costco — Cheapest overall (membership required)
2. Asda — National pricing, no loyalty card needed
3. Tesco, Sainsbury's, Morrisons — Within a penny of each other
4. Independent stations — Varies widely by location
5. Shell, BP, Esso — Typically 5 to 10p more per litre
6. Motorway services — 15 to 25p more per litre

For a full ranking, read our cheapest petrol stations in the UK, or use our comparison tool to check prices in your area.

The Bottom Line

For standard fuel, there is no quality difference between supermarket and branded forecourts. The fuel meets the same specifications and comes from the same source. The only reason to pay more at a branded station is if you specifically want their premium fuel, their loyalty scheme, or their forecourt facilities. For your wallet, supermarket fuel is the smart choice.