Bangchak's posted pump prices for 21 Oct 2026: high-speed diesel 43.54 baht/litre, B20 diesel 37.19 baht (unchanged), gasohol 95 42.04 baht, gasohol 91 41.67 baht, E20 35.69 baht. Prices exclude Bangkok's local land tax, and tomorrow's prices take effect at 05:00. For fleet and delivery budgets, use B20 vs high-speed diesel as the cost gap, and check your own station's price before fuelling.