Fuel Types & Quality
Supermarket Fuel
Is supermarket fuel inferior?
CheckFuelPrices Editorial
Expert Written • 4 industry sources
No, supermarket fuel is not inferior in any legally meaningful sense. All petrol and diesel sold in the UK must meet the same British and European standards — BS EN 228 for petrol and BS EN 590 for diesel — whether it comes from Asda or BP.
The Same Legal Standard Applies Everywhere
Regulated by law:
UK fuel quality is governed by strict regulations requiring all petrol and diesel to meet defined chemical and performance standards before it can be sold at any forecourt.
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Same refineries, different pumps:
Supermarket fuel and branded fuel frequently originate from the same refineries and are transported through shared pipelines. The base fuel is chemically identical.
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E10 is standard everywhere:
Since September 2021, E10 petrol (containing up to 10% bioethanol) became the UK standard grade. This applies equally to supermarkets and branded stations.
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Where Branded Fuel Does Differ
Additive packages:
Branded fuels such as Shell V-Power or BP Ultimate contain proprietary cleaning and performance additives above the minimum requirement. Supermarket fuel meets minimum additive specs but uses a simpler formulation.
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Marginal benefit for most drivers:
For the vast majority of everyday petrol and diesel cars, the extra additives in premium branded fuel make no noticeable difference to performance or engine life.
Premium grades are different:
Both supermarkets and branded stations sell premium grades (e.g. higher-octane E5 petrol). If your vehicle requires or benefits from a premium grade, that consideration applies regardless of where you fill up.
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The Price Gap Is Real
Supermarkets are consistently cheaper:
Supermarket forecourts typically undercut branded stations by 3–8p per litre, using fuel as a footfall driver. On a 55-litre fill, that can mean saving over £4.
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Prices vary even between supermarkets:
Asda, Tesco, Sainsbury's and Morrisons do not always charge the same price, and the gap can shift week to week depending on local competition.
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Making the Right Choice for Your Car
Check live prices before you fill:
Since the base fuel quality is equal, the smartest move is usually to buy the cheapest compliant fuel for your vehicle. CheckFuelPrices shows live prices at 4,000+ UK stations updated every 30 minutes.
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High-performance vehicles may benefit from branded premium:
If you drive a high-performance or turbocharged engine and want to maximise the additive benefit, a branded premium fuel may be worth the extra cost — but this is the exception, not the rule.
Sources
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