Supermarket Fuel vs Branded: Is There Really a Difference?

Summary

• Same Base Fuel: All UK petrol and diesel comes from the same refineries. Supermarket fuel meets identical standards.
• Additives Are the Difference: Branded fuels contain more cleaning additives, but the benefit for most cars is minimal.
• Save 5-10p Per Litre: Supermarket fuel is cheaper and perfectly safe. Use our fuel finder to compare prices.

It's one of the biggest debates among UK drivers: should you pay extra for Shell or BP, or is Tesco petrol just as good?

Some swear by branded fuel. Others think it's a waste of money. Let's look at what's actually true.

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Where Does UK Fuel Actually Come From?

Here's something that might surprise you: most UK fuel comes from the same places.

The UK's Fuel Supply

The UK has six major refineries that produce most of our petrol and diesel:

• Fawley (ExxonMobil) - Hampshire
• Stanlow (Essar) - Cheshire
• Lindsey (Prax) - Lincolnshire
• Grangemouth (Petroineos) - Scotland
• Pembroke (Valero) - Wales
• Phillips 66 (Humber) - Lincolnshire

The Same Tankers, Different Stations

Fuel is transported from refineries to distribution depots. From there, tankers deliver to petrol stations—and the same tanker often supplies multiple brands.

A tanker might deliver to a Shell station in the morning and a Tesco station in the afternoon. The base fuel is identical.

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All UK Fuel Meets the Same Standards

Whether you buy from Asda or Esso, all UK fuel must meet British and European standards:

Every drop of fuel sold in the UK—supermarket or branded—must meet these specifications. It's the law.

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So What's Actually Different?

If the base fuel is the same, why do some people swear by branded petrol? The answer is additives.

What Are Fuel Additives?

Additives are chemicals mixed into fuel that claim to:

• Clean fuel injectors and engine deposits
• Reduce friction and wear
• Improve combustion efficiency
• Protect against corrosion

Branded vs Supermarket Additives

All fuel contains some additives—it's required by EU regulations. The difference is in quantity and type:

Shell V-Power, BP Ultimate, and Esso Synergy Supreme+ all contain proprietary additive packages. They claim these clean your engine better than basic fuel.

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Do Additives Actually Make a Difference?

This is where it gets interesting. The honest answer: for most drivers, probably not much.

The Case FOR Branded Additives

• Independent tests show premium fuels do clean engines slightly better
• High-mileage or older engines may benefit more from deposit removal
• Performance cars designed for premium fuel may see small gains
• Some fleet operators report better fuel economy with premium fuel

The Case AGAINST Paying Extra

• Modern engines are designed to run perfectly on standard fuel
• Regular servicing does more for engine health than expensive petrol
• The performance difference is barely measurable for normal driving
• You'd need to use premium fuel exclusively to see any benefit
• The extra cost rarely pays for itself in better MPG

Most drivers won't notice any difference between supermarket and branded fuel. Your wallet will, though.

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The Real Cost Difference

Let's look at what you're actually paying:

Annual Cost Comparison

If you fill a 50-litre tank twice a month (1,200 litres per year):

• Supermarket: £1,680/year
• Branded standard: £1,776/year (+£96)
• Premium: £1,920/year (+£240)

That's up to £240 extra per year for premium fuel. Is it worth it? For most drivers, no.

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Common Myths About Supermarket Fuel

Let's bust some persistent myths:

Myth 1: "Supermarket fuel damages your engine"

False. All UK fuel meets identical legal standards. Supermarket fuel won't harm your engine. Millions of cars run on it every day without issues.

Myth 2: "You get worse MPG with cheap fuel"

Mostly false. Any difference is tiny—maybe 1-2% at most. You'd need to drive thousands of miles to notice, and the savings from cheaper fuel far outweigh any efficiency difference.

Myth 3: "Supermarket fuel is watered down"

Completely false. Trading Standards and fuel quality regulations prevent this. Selling substandard fuel would result in massive fines and criminal prosecution.

Myth 4: "Premium fuel is better for all cars"

False for most cars. Unless your car specifically requires 97+ octane fuel (check your manual), premium fuel provides no benefit. Standard 95 octane is fine.

Myth 5: "Branded stations have cleaner tanks"

No evidence. All fuel stations must maintain their tanks to legal standards. Supermarkets have the same maintenance requirements as anyone else.

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When Premium Fuel Actually Makes Sense

There are some situations where paying extra might be worthwhile:

Your Car Requires It

Some high-performance cars require 97+ octane fuel. Check your owner's manual or fuel flap. If it says "Super Unleaded Only" or "Minimum 97 RON," you need premium.

Common examples: Porsche, some BMW M models, certain Audi RS models, high-performance Japanese imports.

Your Car Is Older with High Mileage

Occasional tanks of premium fuel might help clean deposits in older engines. But this is a maybe, not a definite benefit.

You Have an Older Car That Needs E5

Since 2021, standard petrol is E10 (10% ethanol). Some older cars need E5 petrol, which is only available as Super Unleaded at most stations. This isn't about brand—it's about choosing the right fuel type.

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The Smart Approach to Buying Fuel

Based on everything we know, here's the smartest strategy:

For Most Drivers

1. Use supermarket fuel as your default—it's safe, legal, and 5-10p cheaper
2. Compare prices with a fuel finder—find the cheapest local option
3. Don't worry about additives—regular servicing matters more
4. Stick to one fuel type—E10 or E5, based on your car's needs

For Performance Car Owners

1. Check your manual—use premium if required
2. Don't pay for "super" if standard premium works—97 octane is 97 octane
3. Compare premium prices too—supermarket super unleaded is often cheaper than branded

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What About Diesel?

The same principles apply to diesel:

• All UK diesel meets BS EN 590 standards
• Supermarket diesel is the same base product as branded
• Premium diesels (Shell V-Power Diesel, BP Ultimate Diesel) contain extra additives
• For most diesel cars, standard supermarket diesel is perfectly fine

One Exception: AdBlue

Modern diesel cars need AdBlue for emissions control. This is separate from diesel fuel and must be topped up regularly. All major stations sell AdBlue, including supermarkets.

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The Bottom Line

Is supermarket fuel as good as branded? For the vast majority of drivers, yes.

• Same base fuel: It comes from the same refineries
• Same standards: All UK fuel meets identical legal requirements
• Additives are the only difference: And their benefit is minimal for most cars
• Save 5-10p per litre: That's £60-120+ per year on fuel costs

Unless your car specifically requires premium fuel, supermarket petrol and diesel are the smart choice. Use our fuel finder to compare prices and start saving today.

For more on picking the right fuel for your car, check out our complete guide to choosing the right fuel.

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