Can 95 and 98 be mixed?

[Oliveira]

If your car requires a minimum of 95 gasoline, it can be mixed; if your car requires a minimum of 98 gasoline, it cannot be mixed. Different grades of gasoline have different octane ratings, with higher grades having higher octane values. Mixing different grades of gasoline does not cause a chemical reaction. Gasoline with a higher octane rating is also more stable. Some engines have excessively high temperatures and pressures in the cylinders during operation, so these engines require higher-grade gasoline; otherwise, the engine may experience knocking. Knocking is an abnormal combustion phenomenon in the engine, which can lead to reduced engine power and increased fuel consumption.