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Old 08-12-2009, 12:45 PM   #1 (permalink)
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what octane are you running?

06-08 impala ss owners what octane are you running in your cars?

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Old 08-12-2009, 05:22 PM   #2 (permalink)
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I only run 93. I've tried to lower grades and my car kicks and bucks on it so I don't do it anymore.

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Old 08-12-2009, 06:37 PM   #3 (permalink)
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My wife and I have only ran 89 with ethonal in ours, and I can't say it doesn't have any issues. I was told it was designed to work best with lower octanes. although we haven't tried high octane in it...I suppose it wouldn't hurt to try. If it runs better...we'll switch...that is a relatively low cost performance boost if it works.. Anyone else...? Mark

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Old 08-13-2009, 07:26 PM   #4 (permalink)
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89 is all it should need. I tried 87, it ran fine for a while, but i cant imagine the engine lasting awhile on 87 octane. To me, 93 is a waste of $$

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Old 08-13-2009, 09:30 PM   #5 (permalink)
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91 all day every day

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Old 08-14-2009, 11:42 AM   #6 (permalink)
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Unless premium is recommended 87 should be fine. Most think they can feel a difference, but the 'puter is programmed for shit gas from the factory.

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Old 08-14-2009, 01:31 PM   #7 (permalink)
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car calls for 91 or better in manual...:eek::eek:

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Old 08-21-2009, 09:17 AM   #8 (permalink)
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the common misconception about octane is that higher octane equals higher performance...

the truth is that octane levels equals resistance to burn or detonate.

the reason high performance vehicles needs higher octane is due to higher compression, higher timing levels, boost or any combination of the above listed.

if a high performance vehicle uses low octane level gas they run the risk of "ping or pre-ignition" or knock as it is called now or detonation...

to use octane higher than recomended is a waste of time and money for two reasons. one it costs more at the pump... two it will cause less effecient burning of the fuel as it will not burn completely, thus you will use more fuel in the process.

the other down side os that using a higher than recommended octane in your fuel you will actually see LOWER HP numbers on a dyno...

so if anyone says that they put 93 octane or worse yet race gas in their car designed for 87 octane and felt a "boost" of power, it is all in their head unless they dialed in more timing, more boost or increased compression somehow.

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Old 08-30-2009, 09:42 AM   #9 (permalink)
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I agree with most of you said SCCAstang, but I have never heard of higher octane fuel burning less efficiently. As you said, the octane rating indicates the fuel's resistance to ignite but once it does most gasoline based fuels burn at the same rate. Using higher than necessary octane fuel wastes money but I don't think the HP will suffer. If you have evidence proving otherwise (ie dyno sheet), please post it. Always looking to learn more.

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Old 09-01-2009, 02:04 PM   #10 (permalink)
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Quote:
Originally Posted by paulcSS View Post
I agree with most of you said SCCAstang, but I have never heard of higher octane fuel burning less efficiently. As you said, the octane rating indicates the fuel's resistance to ignite but once it does most gasoline based fuels burn at the same rate. Using higher than necessary octane fuel wastes money but I don't think the HP will suffer. If you have evidence proving otherwise (ie dyno sheet), please post it. Always looking to learn more.
I do not have dyno proof of lower HP, but there is no chance of higher HP with out changing timing or total compression.

as far as gas mileage, I have run several self administered gas mileage tests on both highway and in town and did see a reduction of mileage ranging anywhere from 1.0-2.0 on the highway and 1.5-3.5 in town.

my lower gas mileage indicates to me that I was running less efficient, thus should have also made less HP.

my tests were made using my 04 Cavalier which recommended 87 octane and for the test I used 93 Octane.

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Old 09-02-2009, 05:13 PM   #11 (permalink)
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Quote:
Originally Posted by sccastang View Post
I do not have dyno proof of lower HP, but there is no chance of higher HP with out changing timing or total compression.

as far as gas mileage, I have run several self administered gas mileage tests on both highway and in town and did see a reduction of mileage ranging anywhere from 1.0-2.0 on the highway and 1.5-3.5 in town.

my lower gas mileage indicates to me that I was running less efficient, thus should have also made less HP.

my tests were made using my 04 Cavalier which recommended 87 octane and for the test I used 93 Octane.
I guess you could do that, BUT any number of things could cause you to have a 1-2 mile loss. Even something as simple as taking off from a light faster than normal, merging onto freeways, more/less weight in the car, temp, weather, ect.

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Old 02-14-2010, 10:57 PM   #12 (permalink)
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I follow the owner's manual's recommendation and run only 93% octane fuel.

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Old 02-15-2010, 01:58 PM   #13 (permalink)
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Quote:
Originally Posted by rounder View Post
I follow the owner's manual's recommendation and run only 93% octane fuel.
good man

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Old 02-20-2010, 07:02 PM   #14 (permalink)
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I only use premium/93 in my 08 SS. It does run on lesser octane but dials back performance and gas mileage a bit. To me its not worth the savings even though I drive quite a bit....have over 67k on her already!!

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Old 02-25-2010, 01:12 PM   #15 (permalink)
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Quote:
Originally Posted by rounder View Post
I follow the owner's manual's recommendation and run only 93% octane fuel.
I dont have the manual on me... but IIRC the minimum is lower than 93... I think it might be 89 or 91. I run 93 as well because I have a tune and light mods, but I used to run lower without any performance loss.

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