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Old 02-26-2010, 02:36 PM   #16 (permalink)
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Either 91 or 93 depending on if I'm in Canada or not. Considering E85.

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Old 02-26-2010, 06:26 PM   #17 (permalink)
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my daughters 2006 monte carlo ss v8 , now has over 90,000 miles ... she has burned nothing but regular {87}octine gas, since new.. monte carlo ss v8 are a little quicker and handle a lot better,/ less lean than our impala ss v8.. they lighter by 75>100 pounds.. her car still has orignal brakes from new / all highway /interstate miles... also her gas mpg goes down 2 mpg in winter , with wnter tires and wheels.. rkvette

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Old 03-20-2010, 06:28 PM   #18 (permalink)
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Owners Manual says.....

91 octane for the SS ('09 manual)

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Old 03-30-2010, 01:23 PM   #19 (permalink)
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Originally Posted by marczsport View Post
91 octane for the SS ('09 manual)
Right, that's what my 09 manual says. So, I use 93 as my favorite gas station offers 87/89/93. When in doubt, follow the manual, They would not tell us to use 91+ unless there was a reason, as GM knows people don't like being told to use Premium.

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Old 04-09-2010, 07:31 PM   #20 (permalink)
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Originally Posted by sccastang View Post
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.
I'm of the opinion that car makers make deals with the oil companies cause unless there are are modifications that lead to higher compression ratios, higher octane fuel does not in any way mean better peformance, ie more power or better fuel economy. That's a fact. This is strictly my opinion, but paying .20 per gallon extra for higher octane when not recommended by the manual is a total waste of money. Has anyone done the math on how much that adds up to over the course of a year?

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Old 04-17-2010, 02:48 PM   #21 (permalink)
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Originally Posted by HammerDown View Post
I'm of the opinion that car makers make deals with the oil companies cause unless there are are modifications that lead to higher compression ratios, higher octane fuel does not in any way mean better peformance, ie more power or better fuel economy. That's a fact. This is strictly my opinion, but paying .20 per gallon extra for higher octane when not recommended by the manual is a total waste of money. Has anyone done the math on how much that adds up to over the course of a year?
the manual DOES recomend 91 or higher IIRC, im buying premium haha 93 octane

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Old 04-18-2010, 09:39 PM   #22 (permalink)
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Originally Posted by rkvette View Post
my daughters 2006 monte carlo ss v8 , now has over 90,000 miles ... she has burned nothing but regular {87}octine gas, since new.. monte carlo ss v8 are a little quicker and handle a lot better,/ less lean than our impala ss v8.. they lighter by 75>100 pounds.. her car still has orignal brakes from new / all highway /interstate miles... also her gas mpg goes down 2 mpg in winter , with wnter tires and wheels.. rkvette
dont the gas comp. mess with the gas in the winter time for pollution reason where gas mileage will drop,?

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Old 04-18-2010, 10:04 PM   #23 (permalink)
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some places they up the octane during the winter months simply because theres less moisture in the air during winter. less water more air so some motors need just a lil more octane to fight pre-det...just my .02 cent

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Old 04-23-2010, 10:42 PM   #24 (permalink)
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I always use 91. My gas mileage drops everytime I fill up in CA no matter what car I drive so I guess it is their gas. Their speed limit is also 10 mph slower so it should go up if anything.

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