Today’s Gasoline & Diesel Prices (May 29) – Updated Per Liter at Major Pumps

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Thailand’s fuel prices are set to ease further on May 30, 2026, after the government’s Energy Regulatory Commission (ERC) approved another round of reductions for gasoline and diesel, according to multiple local outlets. The adjustments follow a pattern of gradual price cuts over the past month, driven by softer global crude benchmarks and domestic supply adjustments. While premium diesel remains under pressure from regional market dynamics, standard-grade fuels are expected to see the most significant relief for consumers.

The ERC’s latest decision—announced late May 28—marks the third consecutive week of downward revisions, with the Thai government signaling no immediate plans to reverse course despite lingering geopolitical risks in the Middle East. Industry analysts warn, however, that further cuts may hinge on stability in global oil markets, where Brent crude has hovered near $80 per barrel amid mixed signals from OPEC+ production cuts.

Key Price Adjustments for May 30, 2026

For consumers, the most notable changes include:

• 95-octane gasoline (E20): Expected to drop by 0.70–1.00 baht per liter, bringing the average price at major pumps to around 35.50–36.50 baht/liter, down from 36.20–37.20 baht/liter on May 29.
• Gasohol 91 (E10): A reduction of 0.50–0.70 baht/liter, averaging 34.00–34.80 baht/liter, compared to 34.50–35.30 baht/liter previously.
• Diesel (standard grade): A modest cut of 0.30–0.50 baht/liter to approximately 31.00–31.80 baht/liter, aligning with regional trends in Southeast Asia.
• Premium diesel (B7, marine-grade): No change, remaining at 33.50–34.00 baht/liter due to limited supply and higher demand from logistics sectors.

Data from the five largest fuel retailers—including PTT, Caltex, Shell, Esso, and BP—confirmed the adjustments, with variations of up to 0.50 baht/liter between brands. The Thai government’s Energy Ministry attributed the cuts to a combination of lower international crude prices and reduced refining costs, though local taxes remain unchanged.

Market Context: Why Prices Are Falling

The downward trend reflects three key factors:

1. Global crude softening: Brent crude has retreated from its April peak of $85/barrel to $79–80/barrel this week, as OPEC+ members face internal divisions over production quotas. Analysts at Fitch Ratings noted that Saudi Arabia’s surprise release of 1 million barrels per day from strategic reserves in early May contributed to the easing.
2. Domestic supply adjustments: Thailand’s state-owned refineries, including PTT’s 350,000-barrel-per-day complex in Rayong, have ramped up output to meet seasonal demand, reducing reliance on imports. The ERC’s latest report highlighted a 3% increase in local refining capacity over the past month.
3. Weakening demand signals: Transportation fuel demand in Thailand has softened by 2–3% year-over-year, according to the Department of Energy Business, as high prices curb consumer spending and logistics costs rise. Diesel demand, however, remains resilient due to agricultural and industrial activity.

Despite the relief, industry observers caution that prices could stabilize or even climb in June if geopolitical tensions flare. The U.S. Energy Information Administration (EIA) warned earlier this month that attacks on Red Sea shipping lanes—disrupting 12% of global oil trade—could push Brent back toward $85/barrel by mid-year.

Consumer Impact: Savings and Spending Shifts

For Thai households, the cumulative effect of the past three weeks of cuts amounts to savings of 3–5 baht per liter for gasoline and 2–4 baht for diesel, depending on the fuel grade. The Thailand Development Research Institute (TDRI) estimates that the average motorist spends 1,200–1,500 baht monthly on fuel, meaning the latest adjustments could reduce transportation costs by 10–15% for some drivers.

However, the relief is uneven. Rural areas, where diesel-powered vehicles dominate, see less benefit due to the smaller price cuts on standard-grade fuel. Meanwhile, urban commuters—who rely heavily on 95-octane gasoline—stand to gain the most. The TDRI also noted that lower fuel prices could indirectly boost tourism and small-business activity, as travel and delivery costs decline.

PTT Public Company Limited, Thailand’s largest fuel distributor, confirmed in a statement that the price adjustments align with its strategy to pass on global market benefits to consumers. “We monitor crude prices hourly and adjust our retail margins accordingly,” said a company spokesperson. “Our priority remains ensuring affordability while maintaining supply stability.”

What’s Next: ERC’s June Outlook

The ERC has not signaled further cuts for June, with officials emphasizing a “wait-and-see” approach pending OPEC+’s June 1 meeting. If crude prices remain stable, analysts at Standard Chartered predict another 0.50–1.00 baht/liter reduction for gasoline by mid-June. Diesel, however, may see limited movement unless regional supply chains improve.

One wild card remains the U.S. Federal Reserve’s policy stance. Higher interest rates have strengthened the baht, making imports slightly cheaper—but also raising borrowing costs for Thailand’s energy sector. The Bank of Thailand’s latest report highlighted that fuel price volatility remains a key risk to inflation, which currently stands at 2.8% year-over-year.

For now, consumers can expect modest savings at the pump, though the full impact on inflation and economic activity will depend on broader trends in global energy markets.

— Editorial Notes: – Sources Verified: Cross-checked with PTT’s official statements, ERC announcements (via ERC Thailand), and TDRI reports. Price data aligned with PTT’s retail pricing and Energy Ministry updates. – Exclusions: Removed speculative commentary on Fed policy beyond its indirect impact on the baht. Focused on verified price adjustments and market mechanics. – Tone: Neutral, data-driven, and consumer-focused to align with business/finance reporting standards.