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We recently bought a '13 GC w/ Hemi and looking through the manual, it actually says they recommend 91 octane or higher. I searched threads here and read that you should go no higher than 89... It's on page 124 of the manual from the Jeep website. Costco by us only sells 87 or 93 and for the first few tanks we've been putting 93 in. Anyone else care to weigh in?
 

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Discussion Starter · #3 ·
The manual says it for the 3.6L and 5.7L... typo here as the manual does say SRT but of course it has neither of those engines...
 

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The engine might explode if you put 93 octane. A couple of tanks you say ? Not good brother. Look for muffler bearings to go out first due to increased detonation.
 

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The engine might explode if you put 93 octane. A couple of tanks you say ? Not good brother. Look for muffler bearings to go out first due to increased detonation.
Hard to tell if you are being sarcastic.

I have been running 93 in my 05 HEMI since 2004. No problems at all.
 

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Lol yeah here too. Anytime someone says muffler bearings I'm pretty sure their joking around. BTW Lucas J, using 93 octane in your Hemi has been nothing but a huge waste of money and improper fuel for that vehicle...just an FYI
 

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From Manual:
 

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We recently bought a '13 GC w/ Hemi and looking through the manual, it actually says they recommend 91 octane or higher. I searched threads here and read that you should go no higher than 89... It's on page 124 of the manual from the Jeep website. Costco by us only sells 87 or 93 and for the first few tanks we've been putting 93 in. Anyone else care to weigh in?
The 5th edition of the 2013 owner's manual (OM) states 87 for the V6 and 89 for the Hemi.

The 4th edition of the user's guide (UG) still has 91 listed for both the V6 and Hemi. Both the 2012 OM/UG had 87 for the V6 and 89 for the Hemi. Based upon the previous OM/UG for the 2012 models, that was a copy/paste mistake in the 2013 UG. You can always confirm with the dealer.
 

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natural born world shaker
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Lol yeah here too. Anytime someone says muffler bearings I'm pretty sure their joking around. BTW Lucas J, using 93 octane in your Hemi has been nothing but a huge waste of money and improper fuel for that vehicle...just an FYI
Not when your running a tune for it.

And I guess it was tough to tell I was being sarcastic.
 

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And I guess it was tough to tell I was being sarcastic.
You needed to mention the left handed sky hook to really get your point across. :lol:
 

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One solution would be to pump half 87 and half 93, that should wind up about right.

Back in the aulden daze we use to bump the timing a few degrees when running premium to compensate for the slower burning. Today you have to rely on the computer to compensate or change the programming to bump the advance maps.

To be able to run E85, a V6 must have enough meat in the maps for 93 but that may not be true for the hemi. If running a tuner, the programmer should know what needs to de changed if not detected automagically.
 

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You needed to mention the left handed sky hook to really get your point across. :lol:
I think left handed sky hook is something Kareem Abdul Jabbar invented, I have heard the expression left handed blue sky hooks though.




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I really depends on where you live too. I live in Colorado, where I can get away with putting 85 in my Hemi. Some people say I am crazy, but I have had no problems and I still get "great" gas mileage.
 

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I really depends on where you live too. I live in Colorado, where I can get away with putting 85 in my Hemi. Some people say I am crazy, but I have had no problems and I still get "great" gas mileage.
You are crazy. No way in hell I would put that junk in my HEMI!
 

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I have the same dilemma as the OP. Costco doesn't sell 89, and 91 at Costco is less expensive than 89 at the other dealers.

There is a noticeable difference between 87 and higher octane (at least with the winter formulas and in my '11). I've been alternating by tank, but can clearly see and feel the difference in performance and mpg.

So, to reiterate the OP, assuming I'm not throwing money down the drain because 91 at Costco is less than 89 elsewhere, what's the risk to the engine? I'm assuming the warranties (both original and Chrysler extended) would fully apply with higher octane use.

John
 
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