Bangchak's reference prices for 22 Aug 2026: diesel B20 33.39 baht/litre (up 0.85 from yesterday), High Diesel S 38.39, gasohol 95 37.69, gasohol 91 37.32, E20 32.69. Prices exclude Bangkok local land tax and take effect at 05:00 the next day. Fleet and delivery operators should update fuel cost assumptions and check actual station prices, since the article says the reference may differ at individual stations.