Bangchak's reference prices for 1 Sep 2026: B20 diesel 33.39 baht/litre (up 0.85 baht from the previous day), high-diesel S 38.39, Gasohol 95 37.69, Gasohol 91 37.32, E20 32.69. Prices exclude the Bangkok local land tax and take effect at 05:00 the next day, so confirm at your station. For businesses running delivery vehicles or generators, the B20 vs B7 gap of about 5 baht/litre is worth checking against your fuel purchasing. Prices can move daily, so re-check your budget regularly.