Is the Changan CS75 more fuel-efficient with 92 or 95 octane gasoline?

[SanGarrett]

Changan CS75 is more fuel-efficient with 95 octane gasoline. 92 Octane Gasoline: 92 octane gasoline has an octane rating of 92 and a heptane rating of 8, suitable for mid-range vehicles. 95 Octane Gasoline: 95 octane gasoline consists of 95% isooctane and 5% heptane. High-compression engines should use high-octane gasoline. Using low-octane gasoline in high-compression engines can cause abnormal combustion, leading to knocking, increased fuel consumption, and reduced driving power. Gasoline: Gasoline is a volatile, flammable hydrocarbon mixture liquid distilled and cracked from petroleum, used as fuel. It appears as a transparent liquid, is flammable, with a distillation range of 30°C to 220°C. Its main components are C₅–C12 aliphatic hydrocarbons and cycloalkanes, along with a certain amount of aromatic hydrocarbons. Gasoline has a high octane rating.

[DeRafael]

I've been driving a Changan CS75 for several years, always using 92-octane gasoline, and feel the fuel consumption is quite stable. This car officially recommends 92-octane because the engine design matches low-octane fuel, so there's no need to switch to 95. Using 95-octane is more expensive, costing extra money without necessarily saving on fuel costs; I've recorded with an app that 92-octane gives about 8.2L per 100 kilometers, and switching to 95 didn't make much difference, just costing more for no reason. The key to saving fuel actually lies in daily driving habits, such as gently pressing the accelerator, avoiding sudden braking, and maintaining a steady speed, which has more impact than the fuel grade. Additionally, regular maintenance like changing the air filter and checking tire pressure can help control fuel consumption better. The Changan CS75 is an economical SUV, and its engine tuning is already very efficient—don't believe that higher-octane fuel saves money. Following the manual's recommendation to use 92 is the most practical choice.

[JesseLee]

As a car enthusiast, I must say the difference between 92 and 95 octane gasoline lies in the octane rating - the higher the rating, the better the anti-knock performance, but it doesn't directly help with fuel economy. The Blue Whale engine in the Changan CS75 is typically optimized for 92 octane. Using 95 octane may alter combustion timing and potentially increase fuel consumption, even wasting energy. I've checked the data - many owners' real-world tests show average fuel consumption of 8L/100km with 92 octane, while 95 octane only reduces it slightly by 0.1L. Considering the significant price difference, 92 octane proves more cost-effective. True fuel-saving factors include engine operating temperature and spark plug condition - changing fuel grade isn't the key. I recommend prioritizing fuel quality over grade; avoid cheap, low-quality fuel that could harm engine longevity and ironically increase consumption. In short, matching your vehicle's specifications is what matters most - the CS75 runs perfectly fine on 92 octane.

[Adam]

I use my CS75 to pick up and drop off my kids for school, and I'm used to filling it with 92-octane gasoline. It saves money and fuel? 95-octane is much more expensive, with a difference of several cents per liter, which adds up to significant monthly fuel savings. The car's manual recommends 92-octane, so I trust it. Over time, my fuel consumption has remained stable at 8.5L/100km. I tried 95-octane and didn't notice any significant difference. To save fuel, it's better to maintain steady driving—avoid sudden acceleration and use the air conditioning moderately. The Changan CS75's engine is reliable; don't mess with the fuel grade unnecessarily. It wasn't designed for high-octane fuel, and switching might not improve efficiency and could just cost more.