Should the Audi A6 use 95 or 92 octane fuel?

[VonLila]

The Audi A6 should use 95 octane fuel. Here are the specific details regarding the difference between 95 and 92 octane fuel: The distinction lies in the composition of heptane and isooctane. Specifically, 92 octane fuel contains 92% isooctane and 8% heptane, while 95 octane fuel contains 95% isooctane and 5% heptane. The octane rating of gasoline represents its anti-knock properties—the higher the number, the better the anti-knock performance. Anti-knock refers to the fuel's ability to resist knocking when burned in the engine, which is a critical indicator of gasoline combustion efficiency. Knocking occurs when gasoline burns abnormally inside the engine. The octane number is a measure of gasoline's resistance to knocking; the higher the octane number, the stronger the anti-knock performance. Higher compression ratios and combustion chamber pressures require gasoline with better anti-knock properties. Using lower-octane fuel increases the likelihood of knocking. Since 95 octane fuel has a higher isooctane content than 92 octane fuel, it provides superior anti-knock performance.