Per PTT-affiliated reference from Bangchak (as reported 9 Aug 2026): High-Speed Diesel S 36.69 baht/litre, B20 31.69 baht/litre (unchanged), Gasohol 95 35.99 baht, Gasohol 91 35.62 baht, E20 30.99 baht, E85 26.93 baht. Prices exclude Bangkok local maintenance tax and take effect from 05.00 the next day. For fleets and delivery vehicles, B20 is the cheapest diesel option on this list. Check actual station prices before filling up, since they can differ from the reference.