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Old 18 Oct 2009, 12:16 pm
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Default Honda Accord 2005 VTI-L (2.4, 4 Cylinder). Which Octane level gas to be used, i.e. 91 or 95?

The manufacturer manual says 91 or higher octane gas to be used, my question is that does it really helps the engine to clean carbon in the combustion chamber or is there any overall benefit in producing more power (bhp) by the engine when Octane 95 is used instead of 91?

Please answer considering cost difference as not an issue.
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Old 18 Oct 2009, 12:31 pm
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it don't matter. Just use the least expensive unleaded fuel
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Old 18 Oct 2009, 01:01 pm
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The difference between the gas octane levels is stopping something called detonation or "knock". This is when the combustion process begins before it is supposed to due to intense heat in the engine. The higher level octane the better it prevents "knock". The difference would only come into play if you were to drive the car aggressively and get high in the RPM range alot. When the engine sees "knock" it pulls timing to stop it from happening, this in turn protects the enigne but causes a loss in performance. When driving casually there will be basically no difference.
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Old 18 Oct 2009, 01:16 pm
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higher octane does NOT have more power in it and it won't clean any better. It only allows the fuel to be compressed more to prevent it from combusting to early causing knocking or pinging. Use the lowest recommended octane (91) anything else is a waste of money.
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Old 18 Oct 2009, 02:16 pm
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you need a high enough # to prevent knock( which is not the same as preignition despite what 99% of people will tell you) but any more makes absolutely no difference whatsoever. lower than needed is no good but higher than needed is a waste.
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