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  #49  
Old 02-14-2016, 10:47 AM
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Re: V6 Grand Cherokee...The good and the bad?.

I have a '15 High Altitude V6. Adequate power but no comparison to the Infiniti FX37 it replaced. I'm getting about 16 city, 18 mixed. The 5.7 is rated about the same due to engine mgmt. shutting down 4 cylinders when cruising. I drove one and I'm still torn whether it is worth the $$$ about 3k I think. All in all, I have no trouble merging and getting up to speed with the 3.6 but the hemi would be more fun. Remember... You're pushing 5,000 lbs and that is a lot.

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  #50  
Old 02-14-2016, 11:14 AM
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Re: V6 Grand Cherokee...The good and the bad?.

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Originally Posted by MDBones View Post
It's not that you can't use 91 or higher, it's that it's not recommended.

From the 2014 owner's manual (2016 manual says basically the same)...

3.6L engine - if equipped

This engine is designed to meet all emissions regulations and provide excellent fuel economy and performance when using high-quality unleaded “regular” gasoline having an octane rating of 87. The use of premium gasoline is not recommended, as it will not provide any benefit over regular gasoline in these engines.

5.7L Engine - if equipped

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.

One dealership told me that using 91 may result in greater engine wear as 91 burns hotter than 87 or 89. I use 89 in my V8. Perhaps a more knowledgable engine tech person on this forum could chime in on if 91 really does burn hotter...
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  #51  
Old 02-14-2016, 11:22 AM
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Re: V6 Grand Cherokee...The good and the bad?.

91 burns slower which helps keep it from early detonation in high-compression enginers; I'm not sure about "hotter"...
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  #52  
Old 02-14-2016, 11:44 AM
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Re: V6 Grand Cherokee...The good and the bad?.

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Originally Posted by Jim_in_PA View Post
91 burns slower which helps keep it from early detonation in high-compression enginers; I'm not sure about "hotter"...

Reading up on it just now --- seems that 91 ignites less easily so as to prevent improper detonation due to a variety of factors including cylinder hot spots. Seems the exhaust may be hotter as older cars it can cause damage to exhaust parts. Doesn't seem that it would be a factor really in engine wear per se. I think the slower aspect from what I just read is not to ignite too soon and ignite at once more "evenly" and "predictably" if that is the best way to describe it. So, theoretically I suppose that it may burn a tad higher in that it burns more completely (a very small fractional amount more burned) but other than the exhaust temp, probably of no concern from 89 to 91.
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  #53  
Old 02-14-2016, 12:13 PM
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Re: V6 Grand Cherokee...The good and the bad?.

I agree with all your points regarding octane and not using higher than needed octane, and I would agree that applies to cars that are not flex-fuel. The pentastar V6 though is flex-fuel and can using E85 which is 100+ octane. That means the vehicle needs to be able to not only handle 87 octane, but 100+ octane and a mix in between. Reading a little on E85 compatible engines, some get higher horsepower when running E85. It seems the V6 should be able to adjust timing to utilize E85.
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  #54  
Old 02-14-2016, 12:20 PM
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Re: V6 Grand Cherokee...The good and the bad?.

Quote:
Originally Posted by englanderm View Post
I have a '15 High Altitude V6. Adequate power but no comparison to the Infiniti FX37 it replaced. I'm getting about 16 city, 18 mixed. The 5.7 is rated about the same due to engine mgmt. shutting down 4 cylinders when cruising. I drove one and I'm still torn whether it is worth the $$$ about 3k I think. All in all, I have no trouble merging and getting up to speed with the 3.6 but the hemi would be more fun. Remember... You're pushing 5,000 lbs and that is a lot.
IMO if you are on the fence in deciding then get the v8, the same as being on the fence about any better option because often times you will just sit around a few months from now wishing you had got the better option and that's not good when spending this kind of money on anything. plus when spending 40-50k a few thousand here or there is not really all that much and well worth it to be content with your purchase in the end. That said do what you are doing focus on that addional $3200 or whatever extra the v8 is costing and make that your primary decision point, is that money worth it or not for your purposes, not the couple dollars in the real world mpg differences.
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  #55  
Old 02-14-2016, 12:30 PM
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Re: V6 Grand Cherokee...The good and the bad?.

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Originally Posted by silvermax04 View Post
IMO if you are on the fence in deciding then get the v8, the same as being on the fence about any better option because often times you will just sit around a few months from now wishing you had got the better option and that's not good when spending this kind of money on anything. ...
Ah but it's all about defining "better," isn't it?
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  #56  
Old 02-14-2016, 12:53 PM
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Re: V6 Grand Cherokee...The good and the bad?.

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Originally Posted by BubbaATL View Post
Ah but it's all about defining "better," isn't it?
Exactly its not better if someone doesn't need it or want it, then its a complete waste of money. But if you are on the fence about any option then there is some desire there that you want it. Being on the fence about the decision is more what I'm talking about here.
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  #57  
Old 02-14-2016, 12:59 PM
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Re: V6 Grand Cherokee...The good and the bad?.

Quote:
Originally Posted by not_too_shabby View Post
I agree with all your points regarding octane and not using higher than needed octane, and I would agree that applies to cars that are not flex-fuel. The pentastar V6 though is flex-fuel and can using E85 which is 100+ octane. That means the vehicle needs to be able to not only handle 87 octane, but 100+ octane and a mix in between. Reading a little on E85 compatible engines, some get higher horsepower when running E85. It seems the V6 should be able to adjust timing to utilize E85.
It was designed to handle E85... but what they put in very fine print is that your engine will have less power and poorer fuel economy as a result of burning it.
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  #58  
Old 02-14-2016, 01:39 PM
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Re: V6 Grand Cherokee...The good and the bad?.

Quote:
Originally Posted by silvermax04 View Post
Exactly its not better if someone doesn't need it or want it, then its a complete waste of money. But if you are on the fence about any option then there is some desire there that you want it. Being on the fence about the decision is more what I'm talking about here.
Well yes, that ... but there are other tradeoffs as well beyond just the additional cost, e.g., as reported here, not only poorer mileage but also less responsive handling and "feel" due to the additional weight up front. I know it doesn't happen often that a Hemi buyer "regrets" that decision, but having driven them both I think I probably would.
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  #59  
Old 02-14-2016, 03:40 PM
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Re: V6 Grand Cherokee...The good and the bad?.

Quote:
Originally Posted by BubbaATL View Post
Well yes, that ... but there are other tradeoffs as well beyond just the additional cost, e.g., as reported here, not only poorer mileage but also less responsive handling and "feel" due to the additional weight up front. I know it doesn't happen often that a Hemi buyer "regrets" that decision, but having driven them both I think I probably would.
Agree they are different beasts and you must weigh all that is involved. That said I am anxious to test drive both the v6 and v8 2016s. With lighter aluminum suspension components, adjustable electric power steering and finally some quality stock tires, I think they will both have a much different feel from the 14/15s not to mention the new v6 engine is supposed to have more torque in the lower rpm range.

I have been kind of scouting for a car for my sister and suggested to her to not buy a 2015 GC and wait for the 2016s as she is not in a rush and would just assume wait. Not one of the first new v6s off the line though I don't want her to be a beta tester so in a couple months after some reports come back on them.

So the pluses I'm seeing on the 2016 GC v6 vs the 2015 GC v6 are below, am I missing any that are significant(not looking for any of the SRT features): actually more than I realized once I started typing, just trying to hit the more major items not every tiny little thing.

-2016 New extensively redesigned(80% new parts) v6 engine with +2 mixed mpg over the old 2015 v6.
-2016 new v6 engine will deliver more torque at a lower rpm range than the old 2015 v6.
-2016 New: lighter aluminum suspension components dropping weight and adding to handling feel
-2016 New: adjustable electric steering
-2016 New: quality tires on it stock instead of the crap forteras
-2016 New: easier to use shifter (she wont care about sport mode button movement)
-2016 New: Full-speed Forward Collision Warning-Plus
-2016 New: Park assist system with Stop and Release
-2016 New: Transmission oil heater, should help shifting right after startup
-She can get a 2016 anytime she wants for 7% under invoice with the group buy.
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  #60  
Old 02-15-2016, 10:13 AM
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Re: V6 Grand Cherokee...The good and the bad?.

i had a '14 Overland Hemi and now own a '15 Overland Pentastar. In short, i would take the Hemi over the V6. I miss the WOT sound of the Hemi, the torque, and highway passing power (over 55mph). When ordering the v8 you don't only get the v8, but also the HD brakes and the upgraded transmission. Do you really need the v8? No. You get it because you can.

That being said, the overall handling feel of the v6 Overland is superior. The engine is adequate for the jeep and, with the dual exhaust, sounds much better than other competitor's v6. The weight does make a difference in the day to day commute. I read that braking distance is reduced by 10-20 ft, probably due to less weight. So, compared to the 2014 Hemi, my 2015 is smoother, has the better stereo (H/K w/ BluRay DVD) and burns less gas.
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