Per Bangchak's posted prices on 16 Aug 2026: diesel 37.54 baht/litre, B20 32.54 baht/litre (up 0.85 baht from the previous day), gasohol 95 at 36.84 baht and gasohol 91 at 36.47 baht. For fleet, delivery or transport-dependent businesses, fuel is a daily cost line, so re-check your diesel budget and delivery pricing. Switching between diesel and B20 may be worth comparing for vehicles that accept it.