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  #13  
Old 09-19-2015, 10:41 PM
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Re: 2016 V-6 No longer Recommends 89 oct???

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Originally Posted by MDBones View Post
Interesting. My 2014 manual recommends 87 for the V6 and 89 for the V8.

I can't see any reason why they'd recommend anything higher for the V6.
My 14 was a late build and the owners manual said the 3.2 V6 was to use
87/89. Now my 2015 says the 3.2 V6 is to use 87. Now the federal gas 87,89,91,93 have 3.5% oxygen and ca and the west coast gas only has 1.8% oxygen which is a handicap for the west coast gas.

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  #14  
Old 09-21-2015, 08:15 AM
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Re: 2016 V-6 No longer Recommends 89 oct???

To be sure i looked in the on my 15 limited book on page 202 at the bottom and it said 4 cyl and 3.2 87 octane and mine is a lte build. My 14 tralhawk said 87/89. The only diff between my 14 and 15 was the gear ratio as the 14 had trailer tow with 3.5 gears to the 15 non trailer tow with 3.25 gears and the 15 is 519 lbs lighter. The only thing i miss on the 14 was the transfer case with the sport mode. If i didnt get the tranny flash i would of keep it as i didnt like that it only down shifted to 3 gear and at a stop i had to wait at least 4 to 5 seconds to have it go into 1st gear OR manual shift it into 1st every time so the dealer gave me a hell of a deal on a late build 15 limited with the same options except 4x4 witch i didnt want anyway. The other change was color as we had to go to brilliant black from deep cherry.
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Old 09-21-2015, 08:20 AM
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Re: 2016 V-6 No longer Recommends 89 oct???

The 2015 V-6 recommends 89 oct in manual. You can download latest manual on Jeep website.
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  #16  
Old 09-21-2015, 08:48 AM
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Re: 2016 V-6 No longer Recommends 89 oct???

I just called chrysler and they looked it up with my VIN NUMBER and for the 3.2 in 14 and 15 they said 87/89 but recommend 89 in the 3.2 for normal and max performance. The way i drive i guess 89+ is recommend lol.
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Old 09-21-2015, 09:13 AM
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Re: 2016 V-6 No longer Recommends 89 oct???

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Originally Posted by jim383 View Post
I just called chrysler and they looked it up with my VIN NUMBER and for the 3.2 in 14 and 15 they said 87/89 but recommend 89 in the 3.2 for normal and max performance. The way i drive i guess 89+ is recommend lol.
My MY 2014 3.2L ADII built in Novemebr of 2013 has never had anything in it but 87 and runs just fine with decent gas mileage. I think the trick is to buy from a station which has a high rate of turn over in its tanks so that the gas doesn't sit long enough to get water in it. I live in Michigan, land of gas gouging prices. I would have to get a significant improvement in gas mileage to pay the extra price for 89. As far as any performance improvement I would have to see it for myself as my 3.2L goes like a bat out of hell running 87.

***There was just a major castrophey here where a Meijer gas station accidentally put regular and diesel in the same holding tank which 800 drivers bought.
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  #18  
Old 09-21-2015, 09:24 AM
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Re: 2016 V-6 No longer Recommends 89 oct???

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Originally Posted by macfan View Post
My MY 2014 3.2L ADII built in Novemebr of 2013 has never had anything in it but 87 and runs just fine with decent gas mileage. I think the trick is to buy from a station which has a high rate of turn over in its tanks so that the gas doesn't sit long enough to get water in it. I live in Michigan, land of gas gouging prices. I would have to get a significant improvement in gas mileage to pay the extra price for 89. As far as any performance improvement I would have to see it for myself as my 3.2L goes like a bat out of hell running 87.

***There was just a major castrophey here where a Meijer gas station accidentally put regular and diesel in the same holding tank which 800 drivers bought.
I think a lot of it is where you live as every1 gets federal gas except the west coast as we get ca mandated gas with very low oxygen it of 1/8% and federal gas has 3.5% oxygen in it. The more oxygen in it the more power it makes as thats 1 reason vp109 works so well with there 6.3%.
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  #19  
Old 09-22-2015, 05:44 PM
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Re: 2016 V-6 No longer Recommends 89 oct???

2014 V6 Limited w/tow

1st year I used mostly 89 and some 100% gas.
This year I have used 87 tier 1 (Shell) fuel and find no difference. My gas mileage has not fallen and operationally still runs great. That includes short 10 mile boat tows to the ramp.
For one if the 2016 does not have 89 recommended I am at a loss to explain what the difference is in the V6 between the '16 and '14 and '15.
Octane should have no impact on MPG. The only impact is on the wallet or so the experts say. After 20 months I now see no difference in mpg or performance.
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Old 09-22-2015, 07:14 PM
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Re: 2016 V-6 No longer Recommends 89 oct???

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Originally Posted by Jeepster910 View Post
2014 V6 Limited w/tow

1st year I used mostly 89 and some 100% gas.
This year I have used 87 tier 1 (Shell) fuel and find no difference. My gas mileage has not fallen and operationally still runs great. That includes short 10 mile boat tows to the ramp.
For one if the 2016 does not have 89 recommended I am at a loss to explain what the difference is in the V6 between the '16 and '14 and '15.
Octane should have no impact on MPG. The only impact is on the wallet or so the experts say. After 20 months I now see no difference in mpg or performance.
So far 87 been ok but its about 1.5 mpg behind our 91 with normal driving and at wot 91 is a must to get the full all out performance.
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Old 09-23-2015, 04:55 AM
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Re: 2016 V-6 No longer Recommends 89 oct???

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Originally Posted by jim383 View Post
So far 87 been ok but its about 1.5 mpg behind our 91 with normal driving and at wot 91 is a must to get the full all out performance.
I can agree with you on that.
I still think the performance issue might have something to do with a slight uptick in mpg between 87/89 octane. If I tow a long distance or take a long trip I will use 89. Other than that I find no real difference.
The only issue I have is the trade off in price per gallon. I pay .20 gallon more for 89 vs 87 and the trade off is not there for increased MPG.
Now that gas above is all labeled up to 10% ethanol.

Now if you would like to see a real good improvement in mpg try 100% gas, that is no ethanol added. I use to use it all the time when the difference was only .10-.12 a gallon. Now its .25-.30 gallon and not worth it for the benefit.
I am not sure how much benefit you are gaining from using 91 vs 89 instead.
I know My local station sells 87 ethanol, 87 100% gas, and 91 100% gas. Using either of the 100% gas will boost my MPG by 2+mpg.
I know in Illinois they are required to label the gas content if it contains ethanol. A label like "up to 10% ethanol" for each grade that contains it.
They can use less ethanol of no ethanol under that label. If either of those two things happen your mpg will improve. I think that is one of the issues I find when comparing mpg.
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  #22  
Old 09-23-2015, 07:54 AM
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Re: 2016 V-6 No longer Recommends 89 oct???

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Originally Posted by Jeepster910 View Post
I can agree with you on that.
I still think the performance issue might have something to do with a slight uptick in mpg between 87/89 octane. If I tow a long distance or take a long trip I will use 89. Other than that I find no real difference.
The only issue I have is the trade off in price per gallon. I pay .20 gallon more for 89 vs 87 and the trade off is not there for increased MPG.
Now that gas above is all labeled up to 10% ethanol.

Now if you would like to see a real good improvement in mpg try 100% gas, that is no ethanol added. I use to use it all the time when the difference was only .10-.12 a gallon. Now its .25-.30 gallon and not worth it for the benefit.
I am not sure how much benefit you are gaining from using 91 vs 89 instead.
I know My local station sells 87 ethanol, 87 100% gas, and 91 100% gas. Using either of the 100% gas will boost my MPG by 2+mpg.
I know in Illinois they are required to label the gas content if it contains ethanol. A label like "up to 10% ethanol" for each grade that contains it.
They can use less ethanol of no ethanol under that label. If either of those two things happen your mpg will improve. I think that is one of the issues I find when comparing mpg.

Our gas here in ca is .10 between all grades and the last time i filled up the prices were 87 / 3.39...89 / 3.49...91 / 3.59 at most teir 1 stations. I only use mobil and 76 and the other 2 i use if there the only ones around is chevron and shell. When i had my 07 and 12 srt8 i used the 4 at the track and ran same numbers with them and mobil is always the highest in price by at least .10 to .20 on each octane. Mobile out here are price gouging bastards lol. I guess there prices are cheap compared to the vp race gas i buy at 16.00 gal.
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Old 09-25-2015, 06:38 AM
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Re: 2016 V-6 No longer Recommends 89 oct???

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Originally Posted by jim383 View Post
Our gas here in ca is .10 between all grades and the last time i filled up the prices were 87 / 3.39...89 / 3.49...91 / 3.59 at most teir 1 stations. I only use mobil and 76 and the other 2 i use if there the only ones around is chevron and shell. When i had my 07 and 12 srt8 i used the 4 at the track and ran same numbers with them and mobil is always the highest in price by at least .10 to .20 on each octane. Mobile out here are price gouging bastards lol. I guess there prices are cheap compared to the vp race gas i buy at 16.00 gal.
Well I put 89 in yesterday ($2.26) to check it out. The only improvement I can see would be because of the better performance, thus better MPG.
Early on I thought that was the case, especially on the highway.

Where I am at 89 runs at least .20 gallon higher than 87. 91 runs another .20 over 89. Now that is crazy pricing.
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Old 10-11-2015, 07:12 AM
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Re: 2016 V-6 No longer Recommends 89 oct???

Octane rating or octane number is a standard measure of the performance of an engine or aviation fuel. The higher the octane number, the more compression the fuel can withstand before detonating (igniting).
ref: https://en.wikipedia.org/wiki/Octane_rating

An engine will get the best performance/efficiency from a fuel which is not having detonation/pre-ignition (however the absence of an audible 'ping' is not enough to conclude there's no detonation going on). With a compression ratio of 10.7:1, the 3.2 v6 on the Cherokee may be on that 'edge' where under certain heavy loads (greater heat) preignition becomes an issue.

Since detonation can be harmful to the engine, FCA might have felt at first to put in the '87/89' to cover themselves... i.e. more of a lawyer's spec than an engineering spec.

I've always used 87 in our TH but then again, the heaviest load it's had is carrying a few of the grandkids in back.
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