Bangchak pump prices for 15 Oct 2026: B7 diesel 42.94 baht/litre, B20 diesel 37.19 baht (unchanged), gasohol 95 at 41.44 baht, gasohol 91 at 41.07 baht, E20 at 35.69 baht. Prices exclude Bangkok local land tax and take effect from 05:00 the next day, so check your own station before budgeting fuel for delivery vehicles or generators. The gap between B7 and B20 is about 5.75 baht per litre, so a fleet on B20-compatible engines should compare that saving against its maintenance risk.