China's three major gasoline, Sinopec is smelting, PetroChina is mining, and CNOOC is offshore mining. Their quality is not much different, but Sinopec's gasoline quality will be slightly better.
From the perspective of crude oil, there must be differences in oil products. In addition, the world-leading refining technology adopted by Sinopec makes the density of Sinopec gasoline higher than that of PetroChina and CNOOC.
The higher the density of gasoline, the greater the power, so Sinopec's gasoline is more flame-resistant.