How to switch from 95 to 92 gasoline?

[VanValeria]

Method for switching from 95 to 92 gasoline: Simply add 92 gasoline directly to the fuel tank. There's no need to completely drain the 95 gasoline, as different grades of gasoline won't react with each other. If your vehicle can use 92 gasoline, you can make the switch; if not, you shouldn't. The grade of gasoline doesn't indicate its quality. The grade primarily distinguishes the gasoline's anti-knock performance - the higher the grade, the stronger its anti-knock properties. High-grade gasoline (with an octane rating of 95 or above) is typically used in high-compression ratio engines (compression ratio of 11 or higher). Therefore, for regular engines, simply use the gasoline grade recommended by the manufacturer.

[WillowLee]

I just switched to 92-octane gasoline last year, and it's actually quite straightforward but requires proper steps. Before driving to the gas station, make sure your fuel tank is down to about a quarter full to minimize fuel mixing. Simply tell the attendant to fill up with 92-octane, and then avoid long-distance trips immediately—let the engine adapt for a few days. After two months of driving, I noticed the fuel consumption was about 5% higher compared to 95-octane, but I saved nearly 300 yuan per month on fuel costs. After the switch, I felt a slight reduction in power during hard acceleration, but it's perfectly fine for daily commuting. For older cars, it's best to add a bottle of fuel system cleaner to remove carbon deposits, while new cars don’t need to worry about it. Remember to avoid aggressive driving for the first two full tanks after switching to let the ECU readjust to the new octane rating.

[Maverick]

From my experience, oil change should consider the engine compression ratio. For turbocharged cars with a ratio above 10:1, it's better not to switch to 92-octane. My naturally aspirated car has been running on 92-octane instead of 95 for three years without issues. On the day of switching, wait until the fuel warning light comes on before adding 92-octane to avoid mixing old and new fuel. Drive gently for the first 100 kilometers after refueling, keeping RPM below 3000. The cost-saving effect is significant - saving 0.8 yuan per liter at current prices, which amounts to 3,000-4,000 yuan annually. However, pay attention to engine sound changes; if knocking occurs, switch back immediately. Additionally, winter is more suitable for fuel switching as lower temperatures are more forgiving for lower-octane fuel.

[VanMax]

There are three key steps to switch directly from 95 to 92 octane: First, check your vehicle manual to confirm if 92 octane is suitable - generally vehicles with compression ratios below 9.5:1 can use it. Choose to fill your first tank of 92 octane when the fuel level is nearly empty, then drive normally. After switching, my fuel consumption increased by about 0.5L/100km, but the cost per kilometer still dropped by 0.1 yuan. The throttle may feel slightly heavier initially, but you'll adapt within two days of driving. Important reminder: avoid frequent octane rating changes - stick with the new grade for at least three months to allow the ECU to adapt. Northern drivers should note to warm up the engine 30 seconds longer during cold starts in winter, as 92 octane has slightly poorer cold start performance.