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  #37  
Old 07-27-2011, 08:58 AM
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Re: 87 or 89 octane

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Originally Posted by CapecodJeep View Post
I used 87 octane in my 2008 Overland Hemi. no issues regarding performance, nor mileage. Use 87 octane in my 2011 Overland Hemi. no issues regarding performance, nor mileage. IMO, using 87 vs higher octane, normal throttle pressure applied, not frequent WOT, there is NO difference. Honestly, when I do apply WOT on the highway (i.e. to pass a semi, or someone who has no business being in the passing lane), the HEMI responses as designed, no hestiation, no hiccups, just a smooth accerlation, and that lovely HEMI sound. Again, IMO.
I too live in CO and run 85 oct. I have noticed an avg of 15 mpg with mostly city driving. I did run 87 oct. for a month and didn't notice much of a difference.
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  #38  
Old 07-27-2011, 09:01 AM
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Quote:
Originally Posted by SnoWhiteJeep View Post
I live in Colorado and all I see is 85, 87, and 91 Octane. I have a 2011 Grand Cherokee with V8 engine. My manual recommends 89 Octane, but I can't find 89. Which octane should I use?
89 is midgrade.. In Colorado, 87 is mid grade. So use 87
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  #39  
Old 07-27-2011, 09:51 AM
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Re: 87 or 89 octane

I ran 87 in my 5.7L for years. Fuel is a lot more expensive in Canada. Usually 87 octane is anywhere between $1.25 - $1.35 per liter. Premium 91 octane is usually around $1.50 per liter. 93/94 octane is around $1.60 per liter.

with 4 liters to the US gallon, it's roughly $5.00 per gallon for 87 octane.

I recently installed a 93 octane PCM tune and a high performance TCM tune. Needless to say I spend close to $120 to fill my Jeep with 93.

I can say this, 87 was fine in my Jeep when I didn't have the tune.
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  #40  
Old 08-02-2011, 12:37 PM
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87 all the way

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Originally Posted by Red G8R View Post
+1
I use 87 octane....manual says it's fine.
I have a VVT HEMI in my 2009 Ram and will buy the HEMI in the JGC. I have 49XXX miles on my Ram and have EXCLUSIVELY used 87 (never a single drop of 89 has been put in by me) and it runs great and I've never had any problems. The manual even states using 87 is fine but if you want to optimize power, you can use 89. With fuel where it is, why bother with 89? It's not about affording it to me, it's about common sense...why pay more if I don't have to? That's my take.
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  #41  
Old 08-02-2011, 12:57 PM
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Re: 87 or 89 octane

You can also put 87 in and add an octane boost formula.
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  #42  
Old 08-02-2011, 02:10 PM
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Re: 87 all the way

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Originally Posted by HEMInator View Post
The manual even states using 87 is fine but if you want to optimize power, you can use 89.
If the manual explained what "optimize power" means, I'd be more inclined to consider their recommendation. As it is, it sounds like hand waving.
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  #43  
Old 08-02-2011, 03:19 PM
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Re: 87 all the way

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Originally Posted by Andrew Klossner View Post
If the manual explained what "optimize power" means, I'd be more inclined to consider their recommendation. As it is, it sounds like hand waving.
Exactly! Hence..87 octane it is! LOL
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  #44  
Old 08-02-2011, 03:27 PM
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Re: 87 or 89 octane

I just put the 89 in mine its what they recommend and its an extra 10 cents a gallon. Its a 50K vehicle i'm not going to get too excited about an extra 2 dollars to fill it up.
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  #45  
Old 08-03-2011, 03:03 PM
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Re: 87 all the way

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Originally Posted by HEMInator View Post
I have a VVT HEMI in my 2009 Ram and will buy the HEMI in the JGC. I have 49XXX miles on my Ram and have EXCLUSIVELY used 87 (never a single drop of 89 has been put in by me) and it runs great and I've never had any problems. The manual even states using 87 is fine but if you want to optimize power, you can use 89. With fuel where it is, why bother with 89? It's not about affording it to me, it's about common sense...why pay more if I don't have to? That's my take.
Agreed. I have used both. Can't see a noticeable difference.
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  #46  
Old 08-03-2011, 03:18 PM
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Re: 87 or 89 octane

87 is perfectly fine!

Octane rating is NOT about power. It's about the fuels resistance to premature ignition when heated and compressed in the cylinder (aka knock resistance).

Unless you have your vehicle tuned for the specific fuels octane rating it will do nothing for you but lighten your pocketbook.
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Old 08-16-2011, 10:03 AM
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Re: 87 or 89 octane

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Originally Posted by wkjeepgirl86 View Post
Here is another food for thought. Ive read with the hemi engine that with the dirty intake from so much blow by of the PCV valve, and if you think your actually getting 89 your not. The dirty intake is actually lowering your fuel octane level so in theroy if your putting in mid grade your actually getting regular. I installed a catch can to fix this problem. cleaning the intake when i get a chance in the next week or two and hoping the gas millage will go up a little or a little more power will come back. Back to subject. I only buy my gas from the same Shell gass station adn gas has a shelf life of 4 months before it breaks down so i know that ill empty that tank of theirs because the hemi is always hungry!!
I have a breather filter in place of my PCV line that connects to the airbox. There is also a breather line on the intake manifold that is not visible unless you remove the vanity cover but I think it is also a PCV line of some sort. I need to check and see if there is any oily residue in the intake mani behind the TB that will give me my answer.
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