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  #49  
Old 03-21-2013, 06:00 AM
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Re: '14 - Roll call for MPG figures

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Originally Posted by Krisw123 View Post
Is it true you can (should?) use lower octane fuel at altitude? Eg Denver area.
Actually you want higher octane at altitude.
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  #50  
Old 03-21-2013, 06:18 AM
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Re: '14 - Roll call for MPG figures

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Originally Posted by Krisw123 View Post
Is it true you can (should?) use lower octane fuel at altitude? Eg Denver area.
The answer is yes you can ... Not necessarily that you should.

From popular mechanics ... And this was my reasoning as well;

"Octane is the ability of a fuel to resist knock, and high-compression engines tend to knock more. The obverse of that is that lower-compression engines can run on lower-octane gas. Air is thinner the higher above sea level you go. Less air going into the cylinders means less pressure at top dead center when things go bang. It's a lot like lowering the compression ratio in the engine, reducing the need for high octane. Cars will run just fine on lower-octane fuel when they're well above sea level--and all of those states are. Hopefully, by the time you get back down to denser air, you've burned off most of the low-octane stuff, and can refill the tank with higher-grade fuel."

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  #51  
Old 03-21-2013, 09:08 AM
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Quote:
Originally Posted by bill_de View Post

The answer is yes you can ... Not necessarily that you should.

From popular mechanics ... And this was my reasoning as well;

"Octane is the ability of a fuel to resist knock, and high-compression engines tend to knock more. The obverse of that is that lower-compression engines can run on lower-octane gas. Air is thinner the higher above sea level you go. Less air going into the cylinders means less pressure at top dead center when things go bang. It's a lot like lowering the compression ratio in the engine, reducing the need for high octane. Cars will run just fine on lower-octane fuel when they're well above sea level--and all of those states are. Hopefully, by the time you get back down to denser air, you've burned off most of the low-octane stuff, and can refill the tank with higher-grade fuel."
Many thanks. Just about to move to Denver from UK.
Presumably Colorado is "one of those states"!
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  #52  
Old 03-21-2013, 09:28 AM
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2014 overland v8 hemi - avg 17.2 and climbing so far and I'm driving very conservative - if you worried about mpg then you better get the v6 or diesel when it comes out in the summer. on the plus side the v8 has plenty of power and doesn't feel underpowered like the v6
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  #53  
Old 03-21-2013, 09:47 AM
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Re: '14 - Roll call for MPG figures

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2014 overland v8 hemi - avg 17.2 and climbing so far and I'm driving very conservative - if you worried about mpg then you better get the v6 or diesel when it comes out in the summer. on the plus side the v8 has plenty of power and doesn't feel underpowered like the v6
What kind of driving are you doing (City/Highway) and what exactly is very conservative? That's big difference between your 17.2 and the original posters 12.8.
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  #54  
Old 03-21-2013, 10:01 AM
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Re: '14 - Roll call for MPG figures

i would say the driving is right at 50% hwy 50% city, and very conservative is no hard accelerations, coasting as much as possible, and using cruise control on the highway.
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Old 03-21-2013, 10:03 AM
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Re: '14 - Roll call for MPG figures

and my avg mpg is actually slowly rising, I have driven the car for 2 days and I am on my 3rd day now.
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Old 03-23-2013, 08:01 AM
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Re: '14 - Roll call for MPG figures

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Population control.

That is absolutely the funniest response I have ever seen!
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  #57  
Old 03-24-2013, 12:46 AM
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Re: '14 - Roll call for MPG figures

I just finished a 1600 mile trip in my 2014 Overland. About 1200 of this was true highway miles and the rest driving around cities and towns starting and stopping. I average 21.0 exactly for the entire trip. At 75 miles an hour I don't expect to see much more than 22 MPG right now.
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  #58  
Old 03-24-2013, 08:50 AM
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Re: '14 - Roll call for MPG figures

From what I see, there is no MPG improvement for '14, is not on fueleconomy.gov yet.

Lower effective compression is why regular in mountain states is often 85 instead of 87. Is also why I say the place for boost in a gas engine is above 20,000 feet.
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Old 03-24-2013, 05:42 PM
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Re: '14 - Roll call for MPG figures

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Originally Posted by 655321 View Post
2014 overland v8 hemi - avg 17.2 and climbing so far and I'm driving very conservative - if you worried about mpg then you better get the v6 or diesel when it comes out in the summer. on the plus side the v8 has plenty of power and doesn't feel underpowered like the v6
I'm still at 12.3... and still doing lots of city driving. Still avoiding ECO mode until I get a decent break in. Will keep folks posted but for now still sub 13 in city driving using 87.
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Old 03-24-2013, 08:03 PM
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Re: '14 - Roll call for MPG figures

E85 has only 71% of the energy as regular, measured in BTU per gallon. The main advantage of ethanol is a much higher octane rating. In high compression cars (like race cars) this will allow use of a much higher compression motor for more power, but at a high penalty for fuel mileage. Typically you will see a 25-30% lower fuel mileage with E85. The guys I know who use it in their race cars use double the fuel, but are able to increase compression to 13-14:1 and improve their power output by about 20% on the dyno.
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