Should I Use 92 or 95 Octane Gas for My New Car?

[McStella]

Cars with a compression ratio between 8.5 and 9.5 should generally use 92 octane gasoline; vehicles with a compression ratio greater than 9.5 should use 95 octane gasoline. Differences in compression ratio: Cars with a compression ratio between 8.5 and 9.5 should generally use 92 octane gasoline; vehicles with a compression ratio greater than 9.5 should use 95 octane gasoline. Regarding octane rating: 92 octane gasoline has a lower octane rating than 95 octane gasoline. Specifically, 92 octane gasoline contains 92% isooctane, while 95 octane gasoline has an octane rating of 95%. The gasoline octane number represents its octane rating. For example, 92 octane gasoline consists of approximately 92% isooctane and 8% n-heptane. Since isooctane has better anti-knock properties compared to n-heptane, a higher octane number indicates a higher octane rating and better anti-knock performance of the gasoline.