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  #37  
Old 12-16-2011, 11:23 AM
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Re: 87 or 89 Octane in Hemi?

Done one plug change at 50,000km and sold it at 100,000km.
Cant answer that one, only done 20,000km on low octane fuel for 2 services.
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  #38  
Old 12-16-2011, 11:53 PM
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Re: 87 or 89 Octane in Hemi?

I have run 87,89 and 93 octane. Mileage is the same at about 16 mpg. Runs smother and seems to pull easier with the higher octane. Had no issues with 87.
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  #39  
Old 12-18-2011, 09:59 AM
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Re: 87 or 89 Octane in Hemi?

When going to higher octane you need to run at least a couple of full tanks before you will notice a difference.
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  #40  
Old 12-18-2011, 11:46 AM
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Re: 87 or 89 Octane in Hemi?

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When going to higher octane you need to run at least a couple of full tanks before you will notice a difference.

Not so. The computer will adjust the air/fuel mixture as soon as it senses the higher octane fuel. It will change the timing to adjust for the fuel. This should take affect in the first few gallons burned.

http://chemistry.about.com/od/chemis...ine-to-buy.htm
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  #41  
Old 12-19-2011, 04:34 AM
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Re: 87 or 89 Octane in Hemi?

But if you fill half a tank at a time you are not getting the full octane.
And the premium octane here is cleaner, cleaner oil at service. Cleaner better running engine.
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  #42  
Old 12-19-2011, 07:07 AM
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Re: 87 or 89 Octane in Hemi?

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Originally Posted by Deserthucker View Post
But if you fill half a tank at a time you are not getting the full octane.
And the premium octane here is cleaner, cleaner oil at service. Cleaner better running engine.

True. You would have to run it to about almost empty then fill up.
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  #43  
Old 12-19-2011, 09:44 AM
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Re: 87 or 89 Octane in Hemi?

I have always followed my owners manual suggestion of using 89 octane grade gas. I have never had any problems whatsoever. I use this instead of 87 octane because it is suggested, after all Hemi does stand for performance.
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  #44  
Old 01-17-2012, 11:23 PM
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Re: 87 or 89 Octane in Hemi?

Up here in Canada they have ethanol in 87 and 89 octanes and no ethanol in the premium so I run premium in my 5.7 GC. For the extra couple bucks per month to run the best in the best it's worth it to me. I also run it in my SRT Challenger. Always Shell and if no Shell stations around its Esso. Never 7-11 or Costco. Shell was proven to have highest amount of detergents in a boil off comparison test.
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  #45  
Old 01-18-2012, 12:00 AM
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Re: 87 or 89 Octane in Hemi?

Yep. I prefer Shell.
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