Bangchak posted 29 Aug prices: high-speed diesel 38.39 baht/litre, B20 diesel 33.39 baht (up 0.85 baht from the day before), gasohol 95 at 37.69 baht, gasohol 91 at 37.32 baht, E20 at 32.69 baht. Prices take effect at 05:00 the next day. These are reference prices before the Bangkok local-area tax, so check your local station. If your fleet or delivery costs run on diesel, rebudget fuel for the coming week, and consider whether B20 suits your vehicles.