ccordingly, the revised tax rate for mineral and bio-fuel is 20%, diesel and bio-diesel is 7%, kerosene 7%, and aviation fuel 7%. The revision of preferential import taxes for a number of petrol and oil products aims to balance the current import taxes to the most favoured nation tariff rates (MFN Tariff) and other special preferential import taxes that follow various regional and bilateral Free Trade Agreements Vietnam has signed.