3.6 V6 very low MPG - Page 2 - Jeep Garage - Jeep Forum

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  #13  
Old 02-24-2015, 03:09 PM
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Re: 3.6 V6 very low MPG

my 2011 got 12 avg... my 2014... same.

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  #14  
Old 02-24-2015, 03:25 PM
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Re: 3.6 V6 very low MPG

My 2014 V6 Limited get's around 14-15 local and on long trips I usually average 22-24 depending on how fast I feel like driving. I think once you go over 50-60 on the highway your mpg starts going south.
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  #15  
Old 02-24-2015, 03:47 PM
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Re: 3.6 V6 very low MPG

I too average between 14-15mpg local and 23-25mpg highway with my v6.
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  #16  
Old 02-24-2015, 04:04 PM
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It's not a surprise you guys. I mean your jeeps are 5000 pounds and with an under powered v6 that don't make it's power down low. I mean think about it. It has to work hard to get that weight to move. Hence the low city mileage. Once its moving momentum is there and the engine don't need to work as hard to keep speeds. Hence the decent highway mileage.
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Old 02-24-2015, 05:12 PM
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Re: 3.6 V6 very low MPG

I avg 11mpg over winter solely due to remote starting it about 10 min before driving, more like 15min before over past few weeks in sub 0 temps, but I get around 13-14 mpgs in summer
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Old 02-24-2015, 06:23 PM
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Re: 3.6 V6 very low MPG

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Originally Posted by Strongjeff View Post
You also forget the poor winter fuel blends the sell in the winter. Tire pressure being lower so more rolling resistance burns more fuel.
Why would you assume I forgot about it?

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Originally Posted by Strongjeff View Post
Let's also add that the vehicle losses about 7-20% of its efficiency in the winter too.
I will use your own answer on this one.

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Originally Posted by Strongjeff View Post
That's bs all day.
The thermal efficiency, best understood in layman's terms as horsepower per unit of fuel burned, is actually favored by colder temperatures. Let's not say low temperature extremes but winter weather.

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Originally Posted by Strongjeff View Post
I mean think about it...
The automobile engine converts gasoline (chemical energy) into thermal energy then into mechanical energy. The thermal efficiency is increased by essentially increasing the temperature at which fuel burns in the combustion chamber (helped by the colder air which holds more Oxygen) and by the colder ambient temperature where the engine is located.
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Old 02-24-2015, 06:40 PM
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Re: 3.6 V6 very low MPG

I've never checked my mileage strictly by city or highway driving, I go by my combined average. I have roughly 14.5K miles on it now.

My one way commute to work is 25 miles. Of that, it's about 17 miles highway and 8 miles stop'n go city.

I let my vehicle warm up for several minutes before I take off for work or home.

Highway speeds vary between 60-75 mph depending on the highway and freeway stretches I travel.

In warm weather, my combined average is about 21 mpg and in cold weather it will drop down to about 18.4 mpg on clear roads and down to around 17.9 mpg on snow covered roads when 4WD is engaged more.
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  #20  
Old 02-24-2015, 07:46 PM
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Re: 3.6 V6 very low MPG

Why would you assume I forgot about it?

Easy, your failure to bring it up in a discussion about fuel mileage. one can easily assume you forgot.


I will use your own answer on this one.

Well at least we agree here...


The thermal efficiency, best understood in layman's terms as horsepower per unit of fuel burned, is actually favored by colder temperatures. Let's not say low temperature extremes but winter weather.

I know what thermal efficiency is, i dont need your definition of it, there is a lot more to it then just that. Like for example fuel quality or that fact that winter blends have more butane in them to allow it to vapor at a higher rate. its this higher vapor rate that lowers your winter fuel mileage as well as the colder denser air.


The automobile engine converts gasoline (chemical energy) into thermal energy then into mechanical energy. The thermal efficiency is increased by essentially increasing the temperature at which fuel burns in the combustion chamber (helped by the colder air which holds more Oxygen) and by the colder ambient temperature where the engine is located.

again, i dont need a lesson on what an engine is and does, i am a certified mechanic for the last 6+ yrs on both gas and diesel. But taking part of one of my quotes on a different aspect of fuel mileage and just defining what an engine does with it makes no sense. what counter argument do you have for what i said? i'll reiterate it for you.

-It's an Under powered V6 in a 2.5 ton car.
-It dont make power down low, this means it has to work HARDER to get said weight to move. This equals a significant drop from advertised fuel ratings for city driving.

290hp @6400 and 260Ft-lbs at 4800 (keep in mind these are CRANK numbers and by no means whats going to the ground) and a curb weight of 45xx in 4X2 trim (51xx in 4X4)

did you really think this dont factor into city mileage? id hate to see what the 5spd numbers look like
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Old 02-24-2015, 11:54 PM
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Re: 3.6 V6 very low MPG

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Originally Posted by Strongjeff View Post
Why would you assume I forgot about it?

Easy, your failure to bring it up in a discussion about fuel mileage. one can easily assume you forgot.

what counter argument do you have for what i said? i'll reiterate it for you.

-It's an Under powered V6 in a 2.5 ton car.
-It dont make power down low, this means it has to work HARDER to get said weight to move. This equals a significant drop from advertised fuel ratings for city driving.

290hp @6400 and 260Ft-lbs at 4800 (keep in mind these are CRANK numbers and by no means whats going to the ground) and a curb weight of 45xx in 4X2 trim (51xx in 4X4)

did you really think this dont factor into city mileage? id hate to see what the 5spd numbers look like
Why is your assumption "my failure" ? What argument are we having ?

Glad you are turning the conversation away from thermal efficiency and back to root causes of fuel economy misery and city driving. But somehow the tree shade mechanic in me fails to understand, based on my meager understandings of your explanations, why a Hemi powered Jeep is unable to achieve better fuel economy than the V6. Is the Hemi perhaps underpowered for its weight and has to work harder or how?

Should we even discuss everything else that affects fuel economy, from the aerodynamic drag of the ski mounts and open sunroof to engine accessory/drivetrain losses, from gearing and lubricants (synthetic vs. conventional) to axle alignment ? Not to mention the time-tested discussion on efficient driving behaviors that alone may account for 25-30% difference in fuel economy between drivers ?

On a different note, I am quite content with the fuel economy of my underpowered Jeep in city traffic. I am sure it is not quite as stellar as that of a Jeep that is NOT underpowered, driven in a much less crowded Southern US city traffic. Must be a Jeep thing.
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Old 02-25-2015, 12:58 PM
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Originally Posted by f1anatic View Post

Why is your assumption "my failure" ? What argument are we having ?

Glad you are turning the conversation away from thermal efficiency and back to root causes of fuel economy misery and city driving. But somehow the tree shade mechanic in me fails to understand, based on my meager understandings of your explanations, why a Hemi powered Jeep is unable to achieve better fuel economy than the V6. Is the Hemi perhaps underpowered for its weight and has to work harder or how?

Should we even discuss everything else that affects fuel economy, from the aerodynamic drag of the ski mounts and open sunroof to engine accessory/drivetrain losses, from gearing and lubricants (synthetic vs. conventional) to axle alignment ? Not to mention the time-tested discussion on efficient driving behaviors that alone may account for 25-30% difference in fuel economy between drivers ?

On a different note, I am quite content with the fuel economy of my underpowered Jeep in city traffic. I am sure it is not quite as stellar as that of a Jeep that is NOT underpowered, driven in a much less crowded Southern US city traffic. Must be a Jeep thing.
Well it's your failure to bring it to the table. And since you wanna be politically correct, no its not an argument. It's a discussion.

Now as for the hemi having poor mileage I mean think about it. Based on your thermal efficiency, the hemi is better in that aspect. But hey, its only 2.1 liters bigger and has 2 more cylinders to feed so I guess its not bad when the humble little 3 six only is getting one or two more city mpg.

Let's just not even mention volumetric efficiency of the engine, which is more important then the thermal efficiency of the fuel. No wonder FCA wants to add direct injection and multi air technology to the 3.6 and 5.7....

I gotta go, I'll pick this up later
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  #23  
Old 02-25-2015, 04:26 PM
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Quote:
Originally Posted by f1anatic View Post

Why is your assumption "my failure" ? What argument are we having ?

Glad you are turning the conversation away from thermal efficiency and back to root causes of fuel economy misery and city driving. But somehow the tree shade mechanic in me fails to understand, based on my meager understandings of your explanations, why a Hemi powered Jeep is unable to achieve better fuel economy than the V6. Is the Hemi perhaps underpowered for its weight and has to work harder or how?

Should we even discuss everything else that affects fuel economy, from the aerodynamic drag of the ski mounts and open sunroof to engine accessory/drivetrain losses, from gearing and lubricants (synthetic vs. conventional) to axle alignment ? Not to mention the time-tested discussion on efficient driving behaviors that alone may account for 25-30% difference in fuel economy between drivers ?

On a different note, I am quite content with the fuel economy of my underpowered Jeep in city traffic. I am sure it is not quite as stellar as that of a Jeep that is NOT underpowered, driven in a much less crowded Southern US city traffic. Must be a Jeep thing.
Alright, and now to continue what I was saying.

Driveline losses in relation to fuel economy is miniscule. You wanna talk Drag? Okay, your jeep has a way better drag c/o compared to mine having .41 coefficient. And lubricants make up for a very small % in fuel mileage I get better city mileage on my old 3.7. And I drive like I stole it. But guess what, I was not including driver behavior because it's too much of a variable to consider. Why do you think some people get the 13 or so city mileage while others are getting better like 16 or so? Of course it's driver related.

Here's one, what about gearing? A 3.08 rear is gonna excell in highway mileage over city driving. And a 4.10 will do better I'm the city vs highway.

The 3.08 is gonna load the engine more at low speeds but will turn fewer rpms on the highway. Hence the benifit there. 4.10 will not load the engine as much and makes it easier to move it's weight. Saves on the city but takes a hit on the highway from it turning more rpms
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