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| Topic | using premium gas when the manual 'recommends' it? |
| thisworld 04/05/24 1:30:43 PM #26: | Giant_Aspirin posted... the owner's manual on my car 'recommends' using 91 octane, but says regular 87 octane won't hurt anything. apparently lower octane gas will cause engine 'knocking' and slightly decreased performance. A good rule of thumb is to calculate the fuel requirement using your engine's compression ratio. Higher compression ratio = higher octane needed. Google gave 9.8:1 compression ratio for your car. That's a really high compression ratio for 87. For comparison I once used 87 for a commuter bike with 9.3:1 ratio. But 87 for 9.8:1 ratio? That's pushing it too far imho. My suggestion? Use 91. Honda most probably mentioned 87 for marketing purpose. Not too mention the use of 87 came with a caveat about knocking and top tier fuel. Knocking is a sign of premature combustion tc; keep that up and it will wreck your engine. The line '87 won't damage your engine' was written in controlled lab condition. 20 years road use like you planned is not lab condition and if you blamed Honda, they'd just say "can you prove that you always use top tier 87? also didn't we warn you about knocking?" They wrote that caveat for legal reason. ... Copied to Clipboard! |
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