Bangchak's reference prices for 8 October: high diesel 42.19 baht, B20 diesel 37.19 baht (up 0.75 baht from the previous day), Gasohol 95 at 40.69 baht, Gasohol 91 at 40.32 baht, E20 at 35.69 baht. Prices exclude Bangkok's local land tax and take effect at 05:00 the next morning, so check your local station. For fleets and delivery vehicles, the gap between high diesel and B20 is about 5 baht a litre; budget fuel costs accordingly and check which grade your vehicles use.