Bangchak's reference prices for 25 Sep 2026: B20 diesel 36.44 baht/litre (up 0.75 from yesterday), high-speed diesel S 41.44, gasohol 95 39.94, gasohol 91 39.57, E20 34.94, E85 30.88. Prices exclude the Bangkok local-area tax and take effect at 05.00 the next day. Check your own station before budgeting fuel for delivery vehicles or generators, and compare the B7 and B20 gap if your fleet can run on either.