Diesel Prices Rising Faster than Petrol, up 28 Cpl Across the Largest Cities in Last Week

Why It Matters

Accelerating diesel costs strain logistics, construction and remote power users, while heightened consumer scrutiny could trigger regulatory action. The price gap signals divergent market dynamics that businesses must monitor for budgeting and pricing strategies.

Key Takeaways

• Diesel retail price up 10% week‑on‑week
• International diesel benchmark rose 17% in a week
• ACCC granted interim authorisation to manage supply
• Over 3,000 consumer complaints logged in March
• Petrol price cycles persist in capital cities

Pulse Analysis

The latest ACCC fuel‑price monitor shows diesel outpacing petrol as international benchmarks diverge sharply. Singapore Gasoil 10 ppm, the reference for Australian diesel, surged roughly 17% in a single week, pushing wholesale costs higher and translating into a 10% retail increase across major metros and regional outlets. By contrast, the Singapore Mogas 95 benchmark for petrol rose about 9%, resulting in a more modest 8% retail uptick. This decoupling reflects broader oil‑market volatility, currency fluctuations, and differing demand pressures on the two fuels.

Diesel’s sharper climb is not merely a statistical quirk; it reflects its broader usage profile. Beyond transportation, diesel powers remote generators, heavy‑industry equipment and construction fleets, sectors that have faced supply constraints amid tighter global inventories. The ACCC’s response—granting urgent interim authorisation to the Australian Institute of Petroleum and launching a 12‑month review—highlights regulatory vigilance aimed at preventing shortages and curbing potential anti‑competitive behaviour. Meanwhile, more than 3,000 consumer and small‑business complaints underscore growing public sensitivity to fuel‑price volatility.

For businesses, the widening diesel‑petrol price gap carries tangible budgeting implications. Logistics operators may see freight costs rise faster than anticipated, prompting a reassessment of route optimisation and inventory buffers. Retailers and fleet managers must weigh the timing of fuel purchases against price cycles, especially in capital cities where petrol still follows predictable patterns. Looking ahead, sustained benchmark volatility and exchange‑rate swings suggest that both diesel and petrol prices will remain fluid, keeping the ACCC’s monitoring role and potential enforcement actions in sharp focus.