Is it necessary to use 95-octane gasoline for the Inspire?
2 Answers
It is not necessary to use 95-octane gasoline. According to the official vehicle manual, the Inspire is recommended to use 92-octane gasoline. In addition to checking the appropriate gasoline grade in the vehicle manual, you can also find it marked on the fuel tank cap. Typically, the gasoline grade can also be determined based on the engine's compression ratio. Vehicles with an engine compression ratio between 8.6-9.9 should use 92-octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95-octane gasoline. However, with the application of new technologies, the gasoline grade cannot be solely determined by the compression ratio. Even with a high compression ratio, the engine can be tuned to use lower-octane gasoline due to other influencing factors such as ignition timing, turbocharging technology, and Atkinson cycle technology. Generally, the higher the gasoline octane rating, the higher the octane number and the better the anti-knock performance. 92-octane gasoline contains 92% isooctane and 8% n-heptane, while 95-octane gasoline contains 95% isooctane and 5% n-heptane. If the Inspire occasionally uses the wrong gasoline grade, simply switch back to the correct grade after consumption. However, long-term use of the wrong gasoline grade can have the following effects: For vehicles recommended to use lower-octane gasoline, using higher-octane gasoline will not cause damage, but the increase in octane number may alter the fuel's ignition point, leading to delayed combustion in the engine. This results in reduced engine power and thermal efficiency, manifesting as poorer performance. For vehicles recommended to use higher-octane gasoline, using lower-octane gasoline can cause engine knocking. Due to the significantly lower octane number, the gasoline's ignition point decreases, causing premature ignition during the compression stroke. If combustion occurs before the spark plug ignites, resistance will arise during the upward stroke. This resistance makes the engine run very unstably. If the knocking is mild, it may only increase noise without significant engine damage. However, noticeable knocking indicates severe engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, and in severe cases, cylinder scoring.
I've been driving the Inspire for five years, and according to the user manual, 87-octane gasoline is sufficient. While 95-octane has higher anti-knock properties, it's completely unnecessary unless you frequently engage in aggressive driving or have modified the engine. Using 95-octane might slightly improve acceleration smoothness or reduce carbon buildup, but the price difference adds up to over a hundred yuan more per month. I initially hesitated too, but after trying 95-octane, I noticed no significant difference—just wasted money. Standard 87-octane meets daily needs perfectly, keeping the engine running smoothly and safely. Regular maintenance checks on spark plugs and the fuel system are far more important than obsessing over fuel grades. Don’t overcomplicate things—saving money and peace of mind is the way to go.
