According to Certificate No.: 19KDR/000035 issued by Vietnam Register

VinFast recommends using gasoline with Octane rating RON 91 or higher.

Notes: Using poor quality fuel can leave deposits in the engine or cause engine damage. In addition, there may be some problems in respect of the ability to drive, start and stall, particularly under certain environmental conditions such as high outside temperatures or in high terrain areas with thin air.