Can different types of gasoline be mixed?

[Shannon]

Gasoline can be mixed. There won't be obvious problems in the short term when mixing different grades or types of gasoline. Carbon deposits and fuel system blockages are caused by long-term mixing. Effects of accidental mixing: Don't worry too much about mixing gasoline: When different grades of gasoline are mixed, no special maintenance is required. Just refuel with the appropriate grade as specified by the vehicle when conditions permit. Long-term mixing: Frequent mixing may have certain impacts: The engine may not receive optimal support or may be over-supported, both of which can affect engine performance. Long-term mixing may eventually lead to engine problems. However, an occasional mistake in refueling isn't a big issue - as long as it's not diesel, the impact should be relatively minor.

[LaAdriel]

I specialize in automotive engine design research, and mixing fuel grades carries significant risks. Different gasoline octane ratings like 92 and 95 represent varying anti-knock properties - mixing them may cause uneven combustion during ignition, leading to engine-damaging knocking. The Engine Control Unit relies on sensors to read fuel characteristics, and mixed fuels disrupt its calibration - potentially causing anything from reduced power/increased fuel consumption to severe piston or spark plug damage requiring overhaul. Don't underestimate this: different brands use proprietary additive formulations that may trigger chemical reactions accelerating fuel system deposits or component corrosion when mixed. If you must mix fuels temporarily, use up the tank quickly and refill with specified grade - but long-term mixing is gambling with your vehicle's safety. The key to safe operation is strictly following the owner's manual recommendations - never compromise major mechanical integrity for minor fuel savings.

[MacJaxson]

I've been driving a family car for over a decade and occasionally mixed 92 and 95 octane gasoline. In emergencies, using different grades didn't seem to cause major issues, but I don't recommend making it a habit. For example, last time I mixed half a tank of 92 with half of 95, the power felt slightly unstable, and the fuel gauge showed slightly higher consumption – probably because the engine tuning wasn't optimized for it. Saving money by mixing fuels? Don't be naive. You might save a few bucks short-term but damage engine longevity, costing more in the long run, especially for high-end cars with strict octane requirements where mixing can trigger warning lights. If you do mix, finish that tank before refilling with the correct grade to flush the system. For daily refueling, stick to reputable gas stations and consistently use the specified fuel grade to avoid engine vibrations or noise caused by fuel quality variations, ensuring safer and worry-free driving.

[LaEdward]

I often think about how to save on fuel costs, but mixing different grades of gasoline to save money can do more harm than good. High-octane gasoline is more expensive but protects the engine and ensures stable performance. Mixing lower-grade fuel, like 92 octane into a 95 octane tank, may lower the overall octane rating and cause engine knocking—saving a few bucks on fuel could lead to thousands in repair costs, which isn’t worth it. The car manual emphasizes fuel compatibility, as mixing can affect the computer sensor readings, leading to unstable acceleration or increased emissions. Mixed fueling also wastes money: lower-quality fuel may shorten the lifespan of filters, requiring earlier replacement. The best approach is to stick to the recommended grade and refuel more frequently in smaller amounts. Saving money comes from regular maintenance rather than taking risks—lower maintenance costs in the long run.