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  #25  
Old 09-13-2011, 05:00 PM
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Re: V8 --- what grade of gas to use?

I have the exact same issue (question) as the original poster. I live in Denver, bought a 2011 Overland with the Hemi engine and purchase fuel at Costco, where only 87 and 91 octane are available. The 91 octane at Costco is usually priced the same or lower than 89 at "regular" gas stations, so if there are no issues with using it with the Hemi (even if there is no benefit) from a purely economical perspective it makes sense....

Just my $.02
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  #26  
Old 09-13-2011, 05:25 PM
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Re: V8 --- what grade of gas to use?

OP most likely still had some regular gas in his tank and when filled up with premium ended up with a mid grade blend.

If it ran better that way, then it is a strong indication that he might consider running mid grade from now on as recomended in his owners manual and fuel filler sticker.

If always buying from Costco, consider switching back and forth between regular and premium to optimize costs. (Filling up around 1/2 tank each time).

If you run the cheaper gas, the computer will pull timing to stop any knock. This will reduce fuel economy and torque. Some might not notice it, but it will happen.

Jeep has designed this car to be able to run on regular, without damage, in a pinch if mid-grade is unavailable, but to perform at it's best with mid grade in the tank.
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Old 09-13-2011, 05:50 PM
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Re: V8 --- what grade of gas to use?

Quote:
Originally Posted by Uncle Paul View Post
OP most likely still had some regular gas in his tank and when filled up with premium ended up with a mid grade blend.

If it ran better that way, then it is a strong indication that he might consider running mid grade from now on as recomended in his owners manual and fuel filler sticker.

If always buying from Costco, consider switching back and forth between regular and premium to optimize costs. (Filling up around 1/2 tank each time).

If you run the cheaper gas, the computer will pull timing to stop any knock. This will reduce fuel economy and torque. Some might not notice it, but it will happen.

Jeep has designed this car to be able to run on regular, without damage, in a pinch if mid-grade is unavailable, but to perform at it's best with mid grade in the tank.
This debate never dies. You can run 87 ALL THE TIME without issue. You don't need to feel as if you can run it in a "pinch" and otherwise need to run 89. The vehicle runs fine on 87. I have a HEMI in my 2009 Dodge Ram Laramie and I EXCLUSIVELY used 87 with NO problems and have over 51K on the odometer. If you want to run 89 to optimize the performance, go ahead but if you want to save money use 87. There's ZERO reason to be concerned with using 87. Not trying to pick you on Uncle Paul but I want to make sure we aren't needless scaring people into believe using 87 will in some way harm their vehicle. I have NEVER noticed ANY knocking whatsoever in my HEMI on my Ram and not in my HEMI on my Jeep after one tank either. I'm speaking from experience here.
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Old 09-13-2011, 05:54 PM
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Re: V8 --- what grade of gas to use?

I used 87 in my 08 JGC Limited with the Hemi, I never used anything other then 87 for the three years I owned it, and never had and an issue.
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Old 09-13-2011, 07:04 PM
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Re: V8 --- what grade of gas to use?

Always use what is recommend for performance and computer requirements. Even with premium it's only a couple of dollars more. I pinch pennies but never with my vehicles.
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Old 09-16-2011, 11:46 AM
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Re: V8 --- what grade of gas to use?

IMHO, you are better off worrying about the overall quality of the fuel you use. 87 Mobil, Chevron, etc.. would be preferable to say, ARCO 91. Really what I think it comes down to is benzene vs. Ethanol content. The lefties want more ethanol and less of the "carcinogenic type" components in gasoline. I live in CA currently, and can tell you that any brand or octane of gasoline is garbage here compared to my home state of CO. Why? Because of CARB, EPA and the lefties. WA state just adopted the CA laws and their gas is weak now too. I can smell the difference. Benzene is what gives gas that heavy, sweet aromatic smell. Ethanol, in a word, just smells "bad". It kind of reminds of grease. Ethanol and benzene accomplish basically the same task of limiting predetonation. Ethanol is corrosive and bad for fuel system components and also causes gas to go "stale" a lot faster. Benzene is pretty much awesome but its bad for humans and extremely carcinogenic. The lefties have made your choice for you on what you buy. Standby all other states for the same crap gas and donkey dick "vapor recovery" pump handles we have in CA. CA residents you know what I mean if you ever have filled a motorcycle in CA. Lame. Sorry for my rant. CA sucks. It should be given to Mexico in Exchange for sealed borders. My .02.
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Old 09-19-2011, 07:21 PM
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Re: V8 --- what grade of gas to use?

I use 87 in my 2011 with just over 9k miles. Never had a single issue and it runs great all the time. I never compared gas milage so can't comment on that.
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Old 09-19-2011, 08:50 PM
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Re: V8 --- what grade of gas to use?

I run 89 in mine
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Old 09-21-2011, 12:34 PM
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Re: V8 --- what grade of gas to use?

I was very low on gas and late for an appointment the other week. I had an old 5 gallon gas can with 50:1 premix (which was probably a year old and only 87 octane) from my dirtbike. I threw that in and then filled up later that day. I do love the smell of premix.

I usually put 89 octane in anymore. My wife still puts 87 in it when she fills it up.

I really don't think it matters either way. As long at whatever you put in still burns, you're golden.
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