Supermarket vs Branded Fuel — Are You Overpaying?

With petrol at 150p per litre and diesel approaching 180p, every penny counts right now. One of the simplest ways to save money without changing anything about how you drive is simply choosing where you fill up. Supermarket forecourts are consistently cheaper than branded stations — but many drivers still avoid them, worried they might be getting an inferior product. Here is the truth.

How much cheaper is supermarket fuel?

Right now, supermarket petrol is on average 7-8p cheaper per litre than branded forecourts. In some areas the gap is wider — it is entirely common to find a difference of 10-15p per litre between the cheapest supermarket and a nearby branded or motorway station. On a 55-litre fill-up, that gap is worth between £5.50 and £8.25 every single time you fill up.

7-8p

Average saving per litre at supermarkets vs branded

£5.50

Saving per 55L fill-up

£286

Potential annual saving filling up weekly

Is supermarket fuel the same quality?

This is the question most drivers ask — and the answer is yes, for the vast majority of cars on UK roads.

Every drop of petrol and diesel sold in the UK, whether from Tesco or Shell, must meet strict British Standards. For petrol that is BS EN 228, for diesel it is BS EN 590. These are legally binding specifications covering the exact chemical makeup and performance the fuel must have. Any supplier that failed to meet them would lose their licence immediately. The myth that supermarket fuel is somehow diluted or dirty is simply not true. (source)

The base fuel that comes out of UK refineries is largely the same product. In fact, the same tanker often delivers to multiple brands — it might supply a Shell station in the morning and a Tesco station in the afternoon. The core product is identical.

    Think of it like this: supermarket fuel is like own-brand paracetamol — exactly the same active ingredient as the branded version, made to the same legal standard, just without the marketing budget built into the price.

So what is the difference?

The difference lies in additives — chemical packages that fuel brands mix in after the base fuel leaves the refinery. Branded fuels like Shell V-Power, BP Ultimate and Esso Synergy Supreme contain proprietary additive blends that claim to clean engines, reduce carbon deposits and improve performance. Supermarket fuels also contain additives — it is required by EU regulations — but typically in smaller quantities.

For the vast majority of drivers in everyday cars, this difference is not noticeable and almost certainly not worth paying 7-10p more per litre for. The only drivers who might genuinely benefit from premium branded fuel are those with high-performance cars requiring 97+ octane fuel, or older vehicles with significant carbon build-up where a periodic tank of premium fuel might help clean the engine.

When should you pay for branded fuel?

Your car requires 97+ RON fuel. Check your owner's manual or fuel flap. If it says "Super Unleaded only" or "Minimum 97 RON" — Porsche, BMW M models, some Audi RS models — you need premium regardless of brand.
Your car was made before 2021. Some older engines are not compatible with E10 petrol and need E5 — which is only available as Super Unleaded at most stations. This is about fuel type, not brand.
You have a high-mileage older engine. An occasional tank of premium branded fuel might help clean deposits, though this is a maybe rather than a certainty.

For everyone else — the millions of drivers in Ford Focuses, VW Golfs, Honda Civics and Toyota Corollas — supermarket fuel is absolutely fine. Millions of cars run on it every day without issue.

How to make sure you are always getting the cheapest price

Not all supermarket stations charge the same price, and prices change frequently. The best approach is to check before you leave rather than just pulling into the nearest forecourt out of habit.

Use Save at the Pump to see every station near you ranked by price in real time — updated every hour from the official UK Government data feed.
Use the Supermarkets filter on our map to show only supermarket forecourts near you.
Use the Worth the Drive Calculator — enter your MPG and we will tell you whether it is worth making a small detour to a cheaper station after factoring in the fuel cost of getting there.
Avoid motorway services entirely — they are currently charging around 166p for petrol and 182p for diesel, which is 15-16p above the supermarket average.

At current prices, switching from a branded station to your nearest supermarket forecourt could save the average driver well over £200 a year. That is real money — and it requires absolutely no change to how you drive or what car you own.