Can I add 95 gasoline when 92 gasoline is not used up?
2 Answers
You can add 95 gasoline when 92 gasoline is not used up, but it is not recommended to mix gasoline for a long time, as it may have a certain impact on the performance of the car. Gasoline is a volatile and flammable hydrocarbon mixture liquid obtained from petroleum through distillation or cracking. At room temperature, it is a colorless to light yellow, easily flowing liquid that is difficult to dissolve in water. Mixing different grades of gasoline can easily lead to incomplete combustion, resulting in carbon deposits and shortening the engine's lifespan. Gasoline grades are classified by octane number, which is the ratio of the anti-knock performance of gasoline to that of standard gasoline. The higher the grade, the stronger the anti-knock performance, but higher grades are not necessarily better. The appropriate gasoline grade should be selected based on the engine's compression ratio.
Sure, you can mix them. I've seen plenty of similar cases over the years running my auto repair shop. Modern cars are quite intelligent—the ECU automatically adjusts ignition timing based on the gasoline's anti-knock properties. Adding 95-octane to remaining 92-octane effectively increases the blended fuel's octane rating, which can actually reduce knock risk. However, I wouldn't recommend making this a habit. Different fuel additives mixing long-term in the fuel system may cause injector fouling. Last month, a customer who did this regularly ended up with cold starts shaking like a sieve. If you must mix fuels, it's safer to wait until the fuel light comes on before adding the new grade—the blending ratio significantly affects the engine's adaptation process.
