Petrol Station Guide: How Forecourts Work, Margins & Why Supermarkets Are Cheapest
Most drivers take petrol stations for granted, but forecourt economics are complex — and explain much of the variation in fuel prices between locations. Why is the Tesco forecourt consistently 5p cheaper than the branded station next door? Why do motorway prices seem extortionate? And how do petrol stations actually make money when fuel margins are tiny? This guide explains the full economics of petrol station operation.
For live petrol and diesel price data by country, use the fuel price explorer. For the motorway fuel premium deep-dive, see our motorway fuel prices guide. For the retail margin as a component of pump price, see our petrol price per litre explained guide and the fuel retail margin glossary entry.
Forecourt fuel margin: what a petrol station actually earns
| Cost/revenue item | Typical UK value (p/litre) | Notes |
|---|---|---|
| Pump price (revenue) | 150–160p/l | Varies with crude and local competition |
| Wholesale fuel cost (terminal gate) | ~140–148p/l | Product cost + distribution to site |
| Gross retail margin | ~5–10p/l | Before site operating costs |
| Card transaction fees | ~0.8–1.5p/l | ~80% of transactions are card payments |
| Site electricity (pumps, lighting, canopy) | ~0.5–1.0p/l | Varies significantly with volume |
| Staff (forecourt) | ~0.5–1.5p/l | Lower for unmanned/pay-at-pump sites |
| Rent, rates, maintenance | ~1.0–3.0p/l | Highest cost variable; depends on location |
| Net margin on fuel | ~1–4p/l | Many small sites make <2p/l |
The implication: a small independent forecourt selling 1.5 million litres per year at a 3p/l net margin makes approximately £45,000 profit on fuel alone — very little for a capital-intensive business. The shop and car wash are critical to viability.
Why supermarkets price fuel cheapest
UK and European supermarket chains (Tesco, Asda, Sainsbury's, Morrisons; Leclerc, Carrefour, E.Leclerc in France) operate forecourts as deliberate loss leaders:
- Pricing fuel at 3–8p/litre below branded competitors attracts footfall to the store
- A customer who fills a 50-litre tank while doing a £75 grocery shop generates far more margin from groceries than from fuel
- Supermarkets negotiate better wholesale fuel prices due to very high volumes (some sites sell 10+ million litres/year)
- Supermarkets have lower staffing ratios per litre sold (large, highly automated pay-at-pump sites)
- In France, hypermarket forecourts (Grande Surface) are even more dominant — accounting for over 55% of road fuel volume sold
The CMA (UK Competition and Markets Authority) 2023 fuel market investigation found that supermarkets were passing wholesale price falls through to pump prices faster than branded operators — confirming their role as price setters in local markets.
The motorway price premium explained
UK motorway service area (MSA) operators — Moto, Welcome Break, Roadchef, Extra — pay concession rents to National Highways for the right to operate at specific motorway locations. These rents can reach £1–5 million per year for prime locations. This cost, combined with a captive customer base that finds it inconvenient to exit the motorway, allows MSAs to charge 15–20p/litre more than off-motorway alternatives. For strategies to avoid the premium, see our motorway fuel prices guide.
How forecourts set their pump prices
Pump prices are set by forecourt operators (not by oil companies in most cases) through a process driven by:
- Terminal gate price: the wholesale price they paid their fuel supplier, delivered to their underground tanks
- Local competition: prices at nearby stations — operators use price monitoring apps (Kalibrate, OPIS) to track competitor pricing in real time
- Chain policy: branded networks (BP, Shell, Esso, Jet) may have recommended pricing but individual dealers/operators set the actual price
- Volume targets: stations running low on throughput may drop prices to attract volume; busy stations may price up
For the full pump price decomposition, see our petrol price per litre explained guide.
Types of forecourt operator
| Type | Examples | Pricing strategy | Margin profile |
|---|---|---|---|
| Supermarket forecourt | Tesco, Asda, Leclerc | Loss leader; lowest prices | Near-zero fuel margin; grocery makes profit |
| Motorway service area | Moto, Welcome Break | Captive premium | 15–20p/l above market; high concession rent |
| Branded dealer | BP, Shell, Esso (dealer-owned) | Market tracking + small premium | 5–8p/l; shop revenue critical |
| Unbranded independent | Local independents | Price competitive | 3–6p/l; typically cheapest branded alternative |
| Hypermarket (France/EU) | Carrefour, E.Leclerc | Loss leader; competitive | Similar to UK supermarkets; dominant market share |
Frequently asked questions
-
How much profit does a petrol station make per litre?
- Gross retail fuel margin is typically 5–10p/litre (5–10 ct/l) in the UK/EU. After card fees, electricity, staff, rent, and maintenance, net margin on fuel alone is approximately 1–4p/litre. Motorway services earn 15–20p/litre through captive-customer pricing. Most forecourts depend on shop, coffee, and car wash revenue to be profitable — fuel margins alone are usually insufficient.
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Why is petrol cheaper at supermarkets?
- Supermarkets use forecourts as loss leaders — pricing fuel 3–8p/litre below branded competitors to drive in-store footfall. The grocery margin on a £75 shop is far more valuable than the fuel margin on a tank fill. Supermarkets also benefit from high fuel volumes (better wholesale prices) and automated pay-at-pump sites (lower staffing cost per litre). UK CMA investigations have confirmed supermarkets price competitively and pass wholesale falls through faster than branded operators.
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Why is petrol more expensive on motorways?
- Motorway service areas pay high concession rents (£1–5m/year) to operate at motorway locations. Combined with a captive customer base, this allows MSAs to charge 15–20p/litre above off-motorway alternatives. The premium is not primarily the oil company's — it is the MSA operator recovering its real estate cost from drivers who find it inconvenient to exit. Planning ahead and using off-motorway forecourts saves significant money.