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  #37  
Old 03-20-2013, 01:14 AM
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Originally Posted by f1anatic View Post
what's wrong with that? The vehicle was designed use a lower grade gasoline. Nothing wrong will happen if better gas is used.
Long term use of it could cause excessive carbon build up if it isn't fully burned, which could happen since it will burn slower than the engine is designed for.
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  #38  
Old 03-20-2013, 11:53 AM
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Re: '14 - Roll call for MPG figures

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Originally Posted by loveracing1988 View Post
Long term use of it could cause excessive carbon build up if it isn't fully burned, which could happen since it will burn slower than the engine is designed for.
i'm surprised on the amount of negative feedback from using a high grade gas. I was always under the assumption that larger engines generate greater heat than say a 4 or 6 banger (not talking forced induction) and that premature detination can occur on low grade gas...I'm not a mechanic or anything, but i want the best out of this truck. I typically fill with 91 octane .

Can anyone else chime in on this?
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  #39  
Old 03-20-2013, 12:04 PM
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Re: '14 - Roll call for MPG figures

Higher compression engines you would want or required to use higher octane to stop spark knock (pre-detination).
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  #40  
Old 03-20-2013, 12:13 PM
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Re: '14 - Roll call for MPG figures

It has nothing to do with the size of the engine, but as Snow said, it's the compression ratio. Prior to computer control, anything over 10 - 1 required premium fuel to prevent knocking. Today, if the computer senses knocking it retards the timing. This is not a perfect solution, because with the timing retarded you are not running at full efficiency. That's why the Hemi says 87 - 89 Octane. I will use 89.

Using a higher octane does no harm ... and absolutely no good.


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  #41  
Old 03-20-2013, 12:29 PM
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Re: '14 - Roll call for MPG figures

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Originally Posted by jgc4ever View Post
2014 Jeep Grand Cherokee
EPA Fuel Economy:
3.6L V6 17 city/25 hwy. (2WD),
3.6L V6 17 city/24 hwy. (4WD);
5.7L V8 14 city/22 hwy. (2WD),
5.7L V8 14 city/20 hwy. (4WD);
3.0L EcoDiesel V6 22 city/30 hwy. (2WD),
3.0L EcoDiesel V6 21 city/28 hwy. (4WD).


thanks for this. my WK 4X4 diesel gets the numbers quoted above.
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  #42  
Old 03-20-2013, 12:46 PM
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Quote:
Originally Posted by bill_de View Post
It has nothing to do with the size of the engine, but as Snow said, it's the compression ratio. Prior to computer control, anything over 10 - 1 required premium fuel to prevent knocking. Today, if the computer senses knocking it retards the timing. This is not a perfect solution, because with the timing retarded you are not running at full efficiency. That's why the Hemi says 87 - 89 Octane. I will use 89.

Using a higher octane does no harm ... and absolutely no good.

...
Is it true you can (should?) use lower octane fuel at altitude? Eg Denver area.
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  #43  
Old 03-20-2013, 03:58 PM
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Re: '14 - Roll call for MPG figures

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Originally Posted by Jackspat2 View Post
There's an E85 filling station within throwing distance of my house. I'm not sure if it'll be cost effective to use it. Sounds like a job for excel...
A second fill up with E85 has caused my MPG to drop even further. I'm sitting about 15.5 MPG right now, but it seems like every time my wife drives, the MPG drops horribly!

I just put this into a spreadsheet for what I have seen so far for my MPG and based on current gas prices at the gas station near where I live ($2.99/gal vs 3.79/gal).

These results are strictly on my circumstances at this moment:
Weekly driving of about 200 miles (mostly city) getting 17.1 MPG for regular gas and 15.5 MPG for E85, I would save a whole $5.28 a week by using E85 and extending that through a year, that would be about $275.

Are there any advantages/disadvantages long term using E85 vs regular gas? I found a couple websites but both were so biased that I dismissed them both.
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  #44  
Old 03-20-2013, 04:06 PM
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Re: '14 - Roll call for MPG figures

Almost everyone you find is going to be biased on E85. I actually did go to school and took a class on this. I tell everyone the same thing, take 2 small metal bowls, put some gas in one and E85 in the other. Light them on fire and see which one has more black smoke. All of that carbon is what builds up in your motor over time, if you runs strictly E85 your engine will look pretty much brand new inside after 200k+ miles. The only time I would say not to run it is if it costs more or if your vehicle will be sitting a while, because the alcohol absorbs water.
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  #45  
Old 03-20-2013, 06:00 PM
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Re: '14 - Roll call for MPG figures

Thanks guys for the heads up. I'll drop to 89 and see if I notice a difference in mpg/performance. Sorry to temporarily hijack the thread.
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  #46  
Old 03-20-2013, 09:49 PM
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Re: '14 - Roll call for MPG figures

Quote:
Originally Posted by loveracing1988 View Post
Almost everyone you find is going to be biased on E85. I actually did go to school and took a class on this. I tell everyone the same thing, take 2 small metal bowls, put some gas in one and E85 in the other. Light them on fire and see which one has more black smoke. All of that carbon is what builds up in your motor over time, if you runs strictly E85 your engine will look pretty much brand new inside after 200k+ miles. The only time I would say not to run it is if it costs more or if your vehicle will be sitting a while, because the alcohol absorbs water.
Some genius is going to burn their house down following your advice
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Old 03-20-2013, 10:01 PM
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Re: '14 - Roll call for MPG figures

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Originally Posted by mpatel1080 View Post
Some genius is going to burn their house down following your advice
Don't worry guys, I'm a chemist. Now where are my matches...
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  #48  
Old 03-20-2013, 10:39 PM
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Some genius is going to burn their house down following your advice
Population control.
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