Overview

• The CMA’s latest monitoring shows average petrol at 133.9p per litre and diesel at 141.9p, up 1.9p and 3.5p respectively since end‑May.
• Retail fuel margins remain far above past norms, which the watchdog says indicates retailers are not fully passing on wholesale savings.
• Supermarket margins averaged 8.4% in the first half of 2025 versus 4% in 2017, while major retailers averaged 9.8% versus 6.4% in 2017.
• The CMA will assess retailers’ operating costs in its next road fuel monitoring report due later this year.
• DESNZ says the Fuel Finder scheme remains on track under the Data (Use and Access) Act, requiring stations to update prices and fuel availability within 30 minutes, as Northern Ireland continues to post lower averages by about 6–7p per litre.