The Competition and Markets Authority released a monitoring report on 1 May 2026 showing that fuel margins for retailers remained largely unchanged between February and March 2026, even as petrol and diesel prices rose sharply. The report noted a 26‑pence increase per litre for petrol and 50 pence for diesel during that period. On average, margins were 10.3 pence per litre for petrol and 10.7 pence for diesel, comparable to the 2025 average of 10.7 pence. While a few individual retailers recorded margin rises, the CMA is investigating these cases and will update in the May report. The document also highlighted that local price differences allow motorists to save up to £9 per tank by shopping around, supporting the newly introduced Fuel Finder scheme.
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