Bangchak reference prices for 29 Sep 2026: High-speed diesel S 41.44 baht/litre; B20 diesel 36.44 baht (up 0.75 baht from the previous day); Gasohol E20 34.94; Gasohol 91 39.57; Gasohol 95 39.94. Prices exclude Bangkok local land tax and take effect from 05:00 tomorrow. Fleet and delivery operators should budget fuel at these levels and check actual station prices, since these are reference figures.