For businesses operating a fleet, choosing where to buy fuel can significantly impact running costs. But is supermarket fuel really different from branded fuel, and is paying more for premium fuel worth it?
Supermarket fuel is often cheaper than fuel from major branded forecourts such as Shell, BP and Esso. However, cheaper fuel does not mean lower quality. All petrol and diesel sold in the UK must meet strict legal and technical standards, regardless of where they are purchased.
The main difference between supermarket and branded fuel typically lies in the additive package used by the fuel supplier, rather than in the basic fuel itself.
In this guide, we compare supermarket vs branded fuel, looking at fuel quality, performance, fuel economy and cost to help you decide which option makes the most sense for your business fleet.
Supermarket vs branded fuel: at a glance
Supermarkets and branded fuel both must meet UK fuel standards, so neither should be considered inherently unsafe or unsuitable for everyday vehicles. The main differences are usually price, additives, availability, and your vehicle's specific requirements.
Factor | Supermarket fuel | Branded fuel |
|---|---|---|
Fuel quality | Must meet UK fuel standards | Must meet UK fuel standards |
Price | Often lower | Often higher |
Additives | Contains additives, although formulations vary | Often marketed with proprietary additive packages |
Fuel economy | Suitable for everyday driving | May offer benefits depending on the vehicle and fuel formulation |
Premium fuel options | Available from some supermarkets | Widely available |
Network coverage | Strong in areas where supermarkets operate | Often wider national and motorway coverage |
Best suited to | Cost-conscious fleets and local driving | Fleets prioritising network coverage and specific fuel requirements |
Ultimately, there is no single fuel that is best for every fleet. The right choice depends on your vehicles, routes, fuel requirements and budget.
Differences between supermarket and branded fuel
It’s worth noting that all petrol and diesel sold in the UK must conform to British and European standards. This is "E10" for unleaded petrol and EN 15940 for diesel fuel. Therefore, they all work in the same way, and if you combine fuels from different sources, they will all work without an issue.
The fuel you find in supermarkets is subject to the same regulations as fuel from premium sellers. And they’re held to the same quality and safety standards. So, although it’s cheaper, you can be reassured that you aren’t purchasing a harmful or unsafe product.
However, there are differences between the fuels you can buy today when you take into account the additives that are sometimes added.
Do supermarket and branded fuels meet the same standards?
Yes. Petrol and diesel sold legally in the UK must meet the relevant fuel quality and safety requirements, regardless of whether they are purchased from a supermarket or a major fuel brand.
For petrol, the relevant European standard is EN 228, while conventional diesel is covered by EN 590. These standards set requirements for factors such as fuel composition, performance and quality.
This means supermarket fuel isn't inherently unsafe or unsuitable for your vehicle simply because it costs less. If your vehicle is designed to run on the fuel being sold, it should operate normally when using compliant supermarket or branded fuel.
The difference between fuels is more likely to come from the additives and proprietary formulations used by individual fuel suppliers.
Supermarket fuel
Supermarket fuel is often cheaper because supermarkets use competitive pump pricing to attract customers and encourage people to visit their stores.
That doesn't mean supermarket fuel is poor quality. Supermarket petrol and diesel still have to meet the relevant UK fuel standards.
The main difference is that fuel formulations can contain different additive packages. Additives may be used for purposes such as helping to keep engine components clean or improving certain fuel characteristics. However, the exact formulation varies between suppliers.
For most everyday cars, vans and commercial vehicles, compliant supermarket fuel is a perfectly practical option, particularly when keeping fuel costs down is a priority.
Branded fuel
Branded fuels in the UK generally come with a premium. Yet, they often contain proprietary additives designed to improve engine performance, maintain cleanliness, and boost fuel efficiency. These additives can minimise carbon deposits, leading to smoother operations and potentially reducing long-term maintenance costs.
Supermarket fuel also contains these additives, but likely in lesser quantities than their branded counterparts.
Additionally, the alternative fuel option, commonly known as "super-unleaded fuel," is of higher quality than standard unleaded fuel. However, this difference with superior-quality fuel is primarily felt in high-performance vehicles, such as sports cars.
When is supermarket fuel worth it?
Supermarket fuel can be a good choice for businesses where keeping fuel costs low is a priority and vehicles regularly operate near supermarket forecourts.
It may be particularly suitable for:
Local fleets that operate within a relatively small area.
Small businesses looking to minimise fuel expenditure.
Cars and vans that don't require specialist or premium fuel.
Businesses whose drivers regularly pass supermarket forecourts.
Fleets where the pump price is more important than nationwide network coverage.
However, the cheapest pump price isn't always the lowest overall cost. If a driver has to make a significant detour to reach a supermarket forecourt, any savings at the pump could be offset by additional mileage and lost time.
For fleet operators, it's therefore worth considering both fuel price and convenience when choosing where to refuel vehicles.
Performance and mileage considerations
Supermarket fuel performance
While meeting basic standards, supermarket fuels might not have the same specialised additives found in branded fuels. This disparity could affect engine performance and fuel efficiency, potentially reducing mileage over time.
Branded fuel performance
Branded fuels are engineered with advanced additives tailored to enhance engine performance. They burn cleaner, reducing carbon buildup and potentially extending the life of engine components. This can translate into better mileage and decreased maintenance needs for your fleet.
Cost considerations
Supermarket fuel cost
There's a widespread belief that supermarkets like Tesco, Asda, Sainsbury's, and Morrisons offer fuel at a more affordable rate than branded alternatives. According to Which?, this is true. These supermarkets engage in intense competition when setting their petrol prices, ultimately leading to lower prices at the pump.
Branded fuel cost
Unsurprisingly, due to the addition of detergents and other chemicals, the price of premium fuel is higher than that of regular fuel. Fuel prices vary nationwide depending on the fuel station's location.
For example, rural regions might offer more affordable fuel compared to bustling cities.
The critical advice is to steer clear of motorway fill-ups due to their excessively high prices. Petrol stations capitalise on the fact that when you're on the motorway and running low on fuel, you're compelled to pay regardless of the cost.
Ultimately, if your fleet relies on vehicles with modern small- to medium-sized engines, the benefits of premium fuel may be limited.
However, while some additives can improve the efficiency and lifespan of older vehicles, the benefits of modern vehicles (in terms of reliability, MPG, and cost of upkeep) mean that older cars can be impractical for a fleet owner.
For more practical ways to reduce your fleet's fuel expenditure, see our guide to how to save money on fuel.
When is branded or premium fuel worth it?
Branded fuel can be worthwhile when your fleet needs access to a large network of forecourts, particularly across different regions of the UK.
Major fuel brands can also offer premium petrol and diesel products. However, premium fuel isn't automatically necessary for every vehicle.
Whether premium fuel is worth paying more for depends on your vehicle manufacturer's recommendations and the type of driving your fleet does.
Premium petrol generally has a higher octane rating, while premium diesel may have a higher cetane rating and/or a different additive formulation. Some engines are designed to benefit from specific fuel grades, so drivers should always follow the manufacturer's guidance.
For most standard fleet vehicles, there may be little financial benefit in using premium fuel if the vehicle doesn't require it.
Does premium fuel improve fuel economy?
Premium fuel can improve performance or fuel economy in some vehicles, but the difference isn't guaranteed.
Higher-octane petrol is designed for engines that can take advantage of it, particularly certain high-performance or high-compression engines. If your vehicle manufacturer recommends standard unleaded, using a premium grade may not provide enough additional benefit to justify the extra cost.
The same principle applies to diesel. Premium diesel products can have different additive packages and fuel characteristics, but any improvement in MPG will depend on the vehicle and how it is driven.
For fleet managers, the best approach is to follow the manufacturer's recommended fuel specification and consider the cost per mile, rather than assuming that the most expensive fuel will automatically deliver the best value.
Can I switch between supermarket and branded fuel?
For most vehicles, you can switch between compliant supermarket and branded fuel without a problem, provided you use the correct fuel type and grade specified by the vehicle manufacturer.
For example, a petrol car that is designed to run on standard unleaded can generally be refuelled with compliant standard unleaded from different suppliers.
There's also no need to completely use one supplier's fuel before changing to another. Petrol and diesel from different compliant suppliers can be mixed in the tank.
However, always check your vehicle handbook or manufacturer's guidance if you're unsure which fuel grade your vehicle requires, particularly if it is a high-performance, specialist or commercial vehicle.
Which fuel card is right for you?
Once you've decided which type of fuel works best for your fleet, the next step is choosing a fuel card that gives your drivers convenient access to the right forecourts.
Fleet type | Recommended fuel card | Why it could work |
|---|---|---|
Small local fleet | Supermarket fuel card | Access to competitive pump prices and convenient local refuelling |
Regional fleet | Mixed network fuel card | Flexibility to use both supermarket and branded forecourts |
National fleet | Major branded fuel card | Wider network coverage across the UK |
HGV or long-distance fleet | HGV-focused fuel card | Access to suitable sites and routes for larger vehicles |
The best fuel card ultimately depends on where your drivers operate, which fuel stations they need to access and how you want to manage your business's fuel spending.
Supermarket vs branded fuel FAQs
Is supermarket fuel inferior to branded fuel?
No. Supermarket fuel isn't inherently inferior to branded fuel. Petrol and diesel sold legally in the UK must meet the relevant fuel quality standards.
The main differences can relate to the additives and formulations used by individual suppliers, as well as price and where the fuel is available. For most everyday vehicles, compliant supermarket fuel is a suitable option.
Why is supermarket fuel cheaper?
Supermarket fuel is often cheaper because supermarkets compete heavily on pump prices and may use fuel pricing as a way to attract customers to their stores.
Fuel prices also vary according to factors such as wholesale costs, local competition, operating costs and location. This means supermarket fuel isn't necessarily cheaper at every forecourt or at all times.
Does supermarket fuel affect your car?
Using compliant supermarket fuel should not damage your car when you use the correct fuel type and grade specified by the manufacturer.
If your vehicle requires a particular fuel specification or premium grade, you should follow the manufacturer's recommendations regardless of whether you buy from a supermarket or branded forecourt.
Is branded fuel better than supermarket fuel?
Not necessarily. Both supermarket and branded fuel must meet the required standards. Branded fuels may use proprietary additive packages, but this doesn't mean they will always provide a noticeable improvement in performance or MPG for every vehicle.
The best choice depends on your vehicle, driving requirements, local fuel prices and the availability of suitable forecourts.
Is premium fuel worth the extra cost?
Premium fuel can be worthwhile for vehicles that are designed or recommended to use it. For vehicles that are designed to run on standard fuel, the additional cost may not provide enough benefit to justify paying more.
Check your vehicle handbook or manufacturer's recommendations before making premium fuel the standard choice for your fleet.
Can you mix supermarket and branded fuel?
Yes. For most vehicles, compliant petrol or diesel from different suppliers can be mixed, provided it is the correct type and grade for the vehicle.
You don't generally need to empty the tank before changing from supermarket to branded fuel, or vice versa.
Final thoughts
Choosing between supermarket and premium fuel cards depends on how and where your business operates.
If low upfront costs and local routes are your priority, supermarket cards offer simplicity and savings. But if you need nationwide coverage, fuel efficiency, and advanced reporting tools, premium cards can deliver better long-term value.
Whichever you choose, the key is to pick a card that supports your operational goals and makes managing fuel spend easier – not harder.
Explore our fuel card options to find your perfect match today.
