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  #49  
Old 04-15-2016, 03:13 PM
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Re: Eco mode, huge difference

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Originally Posted by Jeepguy27 View Post
The only difference I notice is that the Jeep is more willing to upshift when eco mode is on. I haven't really noticed any other difference aside from going into 8th at 45 mph. I now only use eco mode when driving on the highway and not in traffic.
Turning it off is actually handy in dealing with heavy and bursty traffic, as it holds gears a bit longer for quicker catchup and also seems to offer a bit more throttle off speed reduction. There is some loss of mileage.

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  #50  
Old 04-15-2016, 06:02 PM
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Re: Eco mode, huge difference

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Originally Posted by philbytx View Post
Why buying premium instead of regular doesn't make a lot of sense unless.......


Save Money and Stop Buying Premium Gas
My 2013 V8's User Guide says "We recommend you use 91 octane or higher for optimum performance". Since there is no 91 octane in my area, I use 93.
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  #51  
Old 04-15-2016, 06:32 PM
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Re: Eco mode, huge difference

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Originally Posted by Lightninrod View Post
My 2013 V8's User Guide says "We recommend you use 91 octane or higher for optimum performance". Since there is no 91 octane in my area, I use 93.
I do the exact same. Except there is no 93 in my area, only 91. So that is what I use. Why pay $3,200.00 extra for a more powerful V-8, then turn around and not be able to draw it's full potential because you're trying to save a few pennies a gallon on fuel? False economy, pure and simple.
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  #52  
Old 04-15-2016, 07:55 PM
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Re: Eco mode, huge difference

89 octane is the "recommended" fuel for the Hemi for best performance. Premium grades higher than that are not going to benefit anyone except the filling station and the refiner. High octane merely burns slower and is indicated for high compression engines to avoid pre-detonation.

Personally, I have run 87 octane "regular" for the entire 68K miles I've driven my MY12 Hemi with zero power issues, zero knocking and good fuel economy.

But it's nice to have choices.
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  #53  
Old 04-16-2016, 08:33 AM
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Re: Eco mode, huge difference

Quote:
Originally Posted by Lightninrod View Post
My 2013 V8's User Guide says "We recommend you use 91 octane or higher for optimum performance". Since there is no 91 octane in my area, I use 93.
Quote:
Originally Posted by Jim_in_PA View Post
89 octane is the "recommended" fuel for the Hemi for best performance. Premium grades higher than that are not going to benefit anyone except the filling station and the refiner.

My 2015 manual also states that 91 Octane fuel is to be used for ,"best performance".... Not 89. It also states that both 89 and 87 Octane are "acceptable". Perhaps this varies with location, I don't know? With that said I'll continue to use 91. I'll save money elsewhere.
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  #54  
Old 04-16-2016, 08:53 AM
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Re: Eco mode, huge difference

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Originally Posted by billt View Post
My 2015 manual also states that 91 Octane fuel is to be used for ,"best performance".... Not 89. It also states that both 89 and 87 Octane are "acceptable". Perhaps this varies with location, I don't know? With that said I'll continue to use 91. I'll save money elsewhere.
That's interesting. I have both the 14 and 16 manuals and both state 87 or 89 octane for the 5.7L, with 89 recommended for best performance. They also state that the use of premium grade is not recommended as it provides no benefit over the recommended grades.

I'm curious as to why an in between model year (15) states something different from that?
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  #55  
Old 04-16-2016, 09:43 AM
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Re: Eco mode, huge difference

Quote:
Originally Posted by MDBones View Post
That's interesting. I have both the 14 and 16 manuals and both state 87 or 89 octane for the 5.7L, with 89 recommended for best performance. They also state that the use of premium grade is not recommended as it provides no benefit over the recommended grades.

I'm curious as to why an in between model year (15) states something different from that?

I have 87, 89 or 93 available in Texas. I used 89 on my first tank and got 14.17 with 1/3 of my miles on highway. Now on my second tank I'm using 93 but don't know my mileage yet. It looks like it will be about the same with exact same amount of highway driving. I fill up once every 10-14 days so I don't really care what my gas mileage is. I turned off Eco mode and will only have it on when I drive on long distances.


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  #56  
Old 04-16-2016, 09:49 AM
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Re: Eco mode, huge difference

Quote:
Originally Posted by MDBones View Post
That's interesting. I have both the 14 and 16 manuals and both state 87 or 89 octane for the 5.7L, with 89 recommended for best performance. They also state that the use of premium grade is not recommended as it provides no benefit over the recommended grades.

I'm curious as to why an in between model year (15) states something different from that?
Like I said, it might be location. Here in Phoenix Summertime temperatures can easily exceed 115 F, and even go over 120 F on some days. In this weather even my 5.0, F-150 gets 91 Premium, or else it will knock like hell under heavy acceleration. If you're pulling anything, forget it. In colder weather, not so much. "Top performance" goes hand in hand with maximum spark advance. On these newer "computer controlled everything" cars, if the computer detects any engine knock, it will automatically retard the timing. That will in turn reduce performance, as well as mileage.

I know the dealer told me to use 91 Octane for best performance as well. Perhaps that doesn't hold true in Fairbanks or Fargo in January, I don't know.
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