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  #25  
Old 12-04-2011, 11:18 AM
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Re: 87 or 89 Octane in Hemi?

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Originally Posted by Gearhead View Post
A petroleum executive once told me 87 octane is a commodity in the oil industry meaning it could have been refined by any company anywhere. He advised I always go with brand name 89 or higher because it was refined to the exact standards of the folks with their name on the big sign at the gas station. 89+ when purchased from the big boys is the as-advertised stuff with detergents and whatever, assuming the retailer doesn't mess it up with sludge in their tanks or shady practices. This executive spent a career in his industry so maybe he drank too much of the cool aid but since I heard this I've stuck with 89 or higher.
Gas is shipped in pipelines to local distributers. Then they add different additives based on brand specs. Then that gas is delivered to local stations. The base gas is all the same at no name and brand name stations. The main difference is the additives that are added at the distributers. They don't ship different octane levels at the pipeline level of distrubition.

http://www.eia.gov/energyexplained/i...gasoline_where
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  #26  
Old 12-04-2011, 04:27 PM
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Re: 87 or 89 Octane in Hemi?

Agreed...but the ethanol levels are different. Costco gas is cheaper as it has higher levels of ethanol. Both my mini dealer and Porsche dealers have signs that go through and that injector assemblies will fail if too much ethanol is used.

Just fyi
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  #27  
Old 12-14-2011, 08:06 AM
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Re: 87 or 89 Octane in Hemi?

95 octane, but I assume Kuwait's octane rating is different. Dealership recommended 95. We get 91(i think it's 91), 95 and 98. (this is of course if I'm getting the numbers right but I know they're all above 90).
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Old 12-14-2011, 10:04 AM
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Re: 87 or 89 Octane in Hemi?

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Originally Posted by peckmv View Post
Gas is shipped in pipelines to local distributers. Then they add different additives based on brand specs. Then that gas is delivered to local stations. The base gas is all the same at no name and brand name stations. The main difference is the additives that are added at the distributers. They don't ship different octane levels at the pipeline level of distrubition.

http://www.eia.gov/energyexplained/i...gasoline_where
I read that and to me it is BS.

The only thing I agree with it is higher octane slows the burn time, which spreads the burn over more of the engine stroke, increasing torque/HP.
Engines with knock sensors will adjust to the fuel, unless the fuel is out of range.
Test I have done with Australian 91 and 98, 98 has always given me better economy. In the wk2 with 12000km it is a difference of 1.5lt/hkm.
Good quality 98 is refined as 98. Other lesser brands may use additives.
Ask the manufactures here they must tell you if it is refined or additive.
I know I drive Gas tankers 95-2000 from BP Kwinana refinery. Spent a lot of time with the engineers and seen the process.
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  #29  
Old 12-14-2011, 01:22 PM
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Re: 87 or 89 Octane in Hemi?

In reality, if the $3 per fillup is having you question whether or not to use the recommended octane or the minimum octane, you have bigger problems.

I use 89 in mine. I have tried 87 and it feels just fine without any power decrease but again, it's $3 per fill up to use the recommended octane.
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  #30  
Old 12-15-2011, 10:51 AM
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Re: 87 or 89 Octane in Hemi?

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Originally Posted by 77rednecktruck View Post
In reality, if the $3 per fillup is having you question whether or not to use the recommended octane or the minimum octane, you have bigger problems.

I use 89 in mine. I have tried 87 and it feels just fine without any power decrease but again, it's $3 per fill up to use the recommended octane.
I agree. I can be fiscally conservative but after spending $41k on a vehicle what's an extra $10-12 per month to use the recommended octane.

I suspect there will always be sides to this discussion. Do what is best for your situation. If 89 octane was the minimum required vs. recommended it would be stated in the manual and/or on the fuel door. My last vehicle required a minimum of 91 octane. Would the knock-sensors adjust for a lower value, yes, but with a reduction in fuel economy and power.
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  #31  
Old 12-15-2011, 11:04 AM
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Re: 87 or 89 Octane in Hemi?

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Originally Posted by Deserthucker View Post
I read that and to me it is BS.

The only thing I agree with it is higher octane slows the burn time, which spreads the burn over more of the engine stroke, increasing torque/HP.
Engines with knock sensors will adjust to the fuel, unless the fuel is out of range.
Test I have done with Australian 91 and 98, 98 has always given me better economy. In the wk2 with 12000km it is a difference of 1.5lt/hkm.
Good quality 98 is refined as 98. Other lesser brands may use additives.
Ask the manufactures here they must tell you if it is refined or additive.
I know I drive Gas tankers 95-2000 from BP Kwinana refinery. Spent a lot of time with the engineers and seen the process.

Worth a read.

http://ask.cars.com/2007/07/premium-gasolin.html
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  #32  
Old 12-15-2011, 05:20 PM
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Re: 87 or 89 Octane in Hemi?

Quote:
Originally Posted by 77rednecktruck View Post
In reality, if the $3 per fillup is having you question whether or not to use the recommended octane or the minimum octane, you have bigger problems.

I use 89 in mine. I have tried 87 and it feels just fine without any power decrease but again, it's $3 per fill up to use the recommended octane.
I agree with this post along with why one would want a bigger engine but don't want to pay for the upkeep of that engine.
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  #33  
Old 12-15-2011, 09:24 PM
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Re: 87 or 89 Octane in Hemi?

For the first 3000 km I used 89 octane, and recorded my overall mileage.
Then I switched down to 87 octane and again monitored my mileage.
I average just around 16.6 mpg with a combination of highway/city.

On the highway I'm getting 12.5 l/100 km or 19 mpg.
I didn't see any difference between the two octane levels except for a savings in my pocket.
Here in Canada gas is around 1.18 per litre for 87 octane and $1.28 litre for 89 octane. Thats a difference of 38 cents a gallon (or additional $7.00 every fill).
I have to fill the tank once a week.
So for me, it makes sense to use 87 octane, and just use 89 when I'm towing, or putting the engine under load conditions.
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  #34  
Old 12-16-2011, 12:30 AM
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Re: 87 or 89 Octane in Hemi?

what about 93? i know in my BMW they strongly discourage lower grades since it will effect performance, it's on the fuel door and manual.
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Old 12-16-2011, 04:52 AM
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Re: 87 or 89 Octane in Hemi?

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Originally Posted by peckmv View Post
I still standby what I have experienced.
Maybe city driving there is no difference.
But were I am doing constant long runs there is a noticeable difference in economy.

The other thing I like about BP ultimate 98 is it is cleaner fuel less contaminants.
I can see the difference in oil changes on my past cars with ultimate 98 the oil is clean clear looking. With 91 it is dark honey dirty looking. Same Fuchs oil and Ryco filter each change. (Commodore or Pontiac V6)
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  #36  
Old 12-16-2011, 07:02 AM
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Re: 87 or 89 Octane in Hemi?

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Originally Posted by Deserthucker View Post
I still standby what I have experienced.
I can see the difference in oil changes on my past cars with ultimate 98 the oil is clean clear looking. With 91 it is dark honey dirty looking. Same Fuchs oil and Ryco filter each change. (Commodore or Pontiac V6)
and one more question-about spark plugs-how long do they last if the low-octane fuel is used constantly? Cause, in the worse end of this all, i ought to repair all 16 with each oil changing...
Thnks!
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