Why Is Petrol a Different Price at Every Station? ⛽

Drive past two petrol stations on the same road and you might see prices 10p or more apart. It seems odd — they're selling the same product. But there are very real reasons why prices vary so much, and understanding them helps you consistently find cheaper fuel.

The five main reasons petrol prices vary

1. The type of station

This is the single biggest factor. Supermarkets (Tesco, Asda, Sainsbury's, Morrisons) sell fuel as a loss leader — they deliberately price fuel cheaply to get customers into their stores, where they make their real profit on groceries. They can afford to charge less because the fuel forecourt is part of a larger business model.

Motorway service stations are at the opposite end. They have a captive audience — drivers who need fuel and have no other option nearby. With no competition at the immediate point of sale, they can charge significantly more. Add higher operating costs (24-hour staffing, expensive motorway land) and you have a recipe for 15-20p/litre premiums.

2. Local competition

Stations in areas with lots of nearby competitors tend to price more aggressively. A station on a busy high street with three other forecourts within half a mile has to be competitive. A station in a rural area with no competition for 10 miles can charge more.

This is why rural fuel prices tend to be higher than urban ones, and why some parts of the UK consistently pay more than others.

3. Operating costs

The cost of running a forecourt varies enormously by location. A station in central London pays far more in business rates and land costs than one in a rural market town. Those costs get passed on in the pump price.

4. Supply chain and distribution

All UK petrol comes from the same refineries and meets the same specifications — the petrol in a Tesco forecourt is chemically identical to the petrol at a Shell station. But the cost of getting it there varies. Remote locations cost more to supply, and those costs filter through to the pump price.

5. Brand fees and margins

Branded stations (BP, Shell, Esso, Texaco) pay fees to use the brand name, access the supplier's supply chain, and often receive marketing support. These costs are embedded in the price you pay. Some of this is offset by better supply deals, but branded stations typically charge 2-5p/litre more than independents.

Typical price differences in the UK — May 2026

Is branded petrol really better?

Branded petrol suppliers often claim their fuel contains special additives that clean your engine and improve performance. There is some truth to this — premium fuels like Shell V-Power and BP Ultimate do contain additional detergent additives that can benefit high-performance engines.

However for a typical family car, the difference in practice is negligible. Standard supermarket fuel meets all EU and UK specifications and will not harm your engine. The cleaning additives in premium fuels have the most benefit in older, high-mileage engines — for a modern car in normal use, you're unlikely to notice any difference.

The 10-15p per litre premium for branded fuel translates to £5-£7.50 on a 50-litre fill. For most drivers, that's money better kept in your pocket.

How the new UK Fuel Finder law helps you

Since February 2026, every UK petrol station is legally required to update their fuel prices within 30 minutes of any change, and submit that data to the government's Fuel Finder database. This means for the first time, drivers can see live, accurate prices at every station before they stop.

Fuel Smarter uses this data to show you the cheapest stations on your route or near your location — so price transparency means you're no longer at the mercy of whichever forecourt happens to be nearby.