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  #13  
Old 04-07-2015, 08:25 AM
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Re: V8s- Which gas do you use?

Snipe, your reply caused me to check the manual again. Actually, it's the "JEEP User Guide, 2013 Grand Cherokee includes SRT8" is printed on the cover.

Started looking for the octane recommendation again.

On pg 124(MAINTAINING YOUR VEHICLE),

Fuel Selection - 5.7L Engine

We recommend you(sic) use of 91 octane or higher for optimum performance.

On pg 125(MAINTAINING YOUR VEHICLE),

Fuel Selection - 6.4L Engine

We recommend you(sic) use of 91 octane or higher for optimum performance.

So, guess we're both correct 👍.

Dan

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  #14  
Old 04-07-2015, 08:41 AM
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Re: V8s- Which gas do you use?

I installed the Hemifever 93 tune in my 5.7 and noticed a significant improvement in performance. I have the option of switching back to 89 with the Diablo Trinity tuner.


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  #15  
Old 04-07-2015, 09:26 AM
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Re: V8s- Which gas do you use?

Lightning...I believe that is a misprint in that particular manual you have for the 5.7 Hemi. The engine hasn't changed from MY11 through MY15 (other than the plug type for MY14+) and every other manual says 89 recommended.
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  #16  
Old 04-07-2015, 09:38 AM
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Re: V8s- Which gas do you use?

Certainly could be Jim but I checked just to be sure I hadn't misread it.

I've always used a higher octane with my later model vehicles, counting on the PCM to advance the timing for a little better performance and MPG. Now, at my age, I don't drive as much so the extra expense isn't that much.

Dan
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  #17  
Old 04-07-2015, 09:47 AM
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Re: V8s- Which gas do you use?

They issued 8 editions for the 2014 Grand Cherokee Owners Manual so mistakes are a plenty in all their documentation.
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  #18  
Old 04-07-2015, 09:55 AM
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Re: V8s- Which gas do you use?

Yep, my 2013 Users Guide says it's the Second Edition on the back cover
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  #19  
Old 04-07-2015, 09:57 AM
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Re: V8s- Which gas do you use?

I started out running a few tanks of 89 through it but I switched to 93 (MD) and haven't gone back. It seems to run like a champ.
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  #20  
Old 04-07-2015, 11:32 AM
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Re: V8s- Which gas do you use?

Quote:
Originally Posted by JeepOverTheLand View Post
Good to know. I thought for sure I would be using 89, seems I may not have to
The owners manual indicates octane range of 87 to 89 and further that the use of premium is not recommended, as it will not provide any benefit over regular gasoline in these engines.

Would appear Jeep has nothing to say about mid-grade. The owner's manual also does not say anything about altitude adjustments for octane--as at higher altitudes, the octane of premium, mid, and regular is lower.

I still use mid-grade as it isn't that much more expensive, and since I usually get touchless car wash the discount brings it down a bit.

I don't need to use mid-grade per the owners manual.

I do always use Top Tier brands labelled on the pump.
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  #21  
Old 04-07-2015, 11:36 AM
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Re: V8s- Which gas do you use?

Quote:
Originally Posted by Snipe315 View Post
You should double check that. The 5.7 HEMI manual recommends 89 octane. Some folks seem to have received the SRT manual by mistake, which is where the confusion comes from.
Triple checking that, it doesn't exactly. It does note that 89 offers optimal performance, but that 87-89 works. This is direct quote from the 7th edition of the 2014 Owners Manual.

5.7L Engine If Equipped [there is a large "89"]
This engine is designed to meet all emissions
regulations and provide satisfactory
fuel economy and performance when using
high-quality unleaded gasoline having
an octane range of 87 to 89. The manufacturer recommends
the use of 89 octane for optimum performance.
The use of premium gasoline is not recommended, as it
will not provide any benefit over regular gasoline in
these engines.
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  #22  
Old 04-07-2015, 11:39 AM
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Re: V8s- Which gas do you use?

Quote:
Originally Posted by SaintGermain View Post
Shell 91 Octane if I can (Yes I know its overkill) because I don't like ethanol. Otherwise Mobil 89 etc. Eventually when I get a tune (Diablo) it will have to be mainly 91 to be effective. I have tried 87 and that is perfectly fine but I could feel the car a little sluggish at times.
Shell 91 has no ethanol?

Nationwide or regional?

This isn't for the Jeep, it is for the snowblower, rototiller, lawn mower, power washer, edge trimmer, cultivator, etc. where that !#$!@$!@#$ ethanol doesn't do them any favors.
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Old 04-07-2015, 12:25 PM
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Re: V8s- Which gas do you use?

I run usually run Husky 94% Octane, do you guys see any issue running this?
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  #24  
Old 04-07-2015, 12:29 PM
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Re: V8s- Which gas do you use?

One thing to remember about gas also is that 87 octane does have slightly more explosive power than 89. 89 or 91 or whatever is only better if your engine can make use of that higher octane. think of the octane as a stabilizer, it will prevent detonation in higher compression engines there by allowing the engine not to retard the timing and giving you maximum power. this 5.7 hemi kind of teeters between the need of 87 or 89 depending on how and where you use it. light loads and cooler climates the engine can likely manage fine on the 87 without retarding timing, heavy loads and hot temps is going to induce detonation where you will get that benefit of the 89 preventing the timing from being retarded. this is why they say there is no benefit going higher than 89, if the engine isn't detonating on 89 then why go higher. an engine like SRT you have to put 91 in it or you will be running on retarded time all the time or a lot of the time anyway.
Don't buy into the marketing of the premium octane gas pump having flashing lights saying power or better gas or whatever. its only better if you have a higher compression engine that can make use of those couple octane points you are buying, its the same gas otherwise, same additives, same detergent just more octane. only other thing to watch out for is if a different grade may or may not contain ethanol, the less the better on that.
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