Research: Enhanced Road Fuel Monitoring Report: May 2026

Why It Matters

The analysis signals pressure on consumer fuel costs and highlights how geopolitical shocks can quickly reshape UK retail margins, informing regulators and retailers about competitive risks.

Key Takeaways

• CMA tracked fuel margins through March 2026 amid Middle East tensions.
• Supermarket stations showed narrower spreads than independent retailers.
• Diesel prices rose slightly more than petrol in the reporting period.
• Retail spreads widened by up to 3 pence per litre in March.
• Data collection leveraged DMCC Act 2024 powers for real‑time monitoring.

Pulse Analysis

The UK road‑fuel market has long been a barometer for broader economic turbulence, and the CMA’s latest monitoring report underscores that sensitivity. By tapping the Digital Markets, Competition and Consumers Act of 2024, the regulator accessed near‑real‑time transaction data across the supply chain, from wholesale refiners to the pump. The ongoing conflict in the Middle East—affecting crude oil shipments and freight rates—has filtered through to domestic prices, prompting a measurable uptick in both petrol and diesel costs during the February‑April window.

Granular analysis reveals divergent trends among retailer types. Supermarket‑anchored forecourts, which benefit from cross‑selling and larger volume contracts, displayed tighter retail spreads than independent stations, whose margins widened by up to three pence per litre. Diesel, traditionally more volatile, outpaced petrol in price growth, reflecting its heavier reliance on imported crude and higher tax components. The report also tracks the retail spread—the gap between wholesale acquisition cost and the pump price—showing a modest expansion that erodes profit cushions for smaller operators.

For consumers, the widening spreads translate into higher out‑of‑pocket expenses, especially in regions dominated by independent retailers. Policymakers can use the CMA’s data to gauge the need for targeted interventions, such as temporary tax relief or competition‑enhancing measures, to curb price spikes. Looking ahead, the regulator’s ability to monitor price dynamics in near real time equips the UK with a proactive tool to respond to future geopolitical shocks, ensuring market transparency and protecting consumer welfare.