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Discussion Starter · #1 ·
On forums like this you see a lot negative issues. However, I am very happy to report I acheived 22.2 MPG on my trip to Cincy today with my 2012 Crew Cab Hemi (120 Miles)! It was raining and no wind and speed for the most part was kept around 65 mph with some at 55 and as high as 72 MPH. My "07" Chevy on the same route approx same speed was 20.1 MPG. :smileup:
 

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2008 RAM 1500 ST 3.7L Magnum V6 PS2
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That's pretty impressive, I know I'd be happy with that!

- Cajun
 

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4WD or 2?
Did you calculate it or use the EVIC?
 

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Wow thats great, the EVIC is great tool to remind us to take it easy to get the best mpg(if that is what you want). Thru my first 4 tanks of gas the EVIC and calculating manually were real close to each other.
 

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On forums like this you see a lot negative issues. However, I am very happy to report I acheived 22.2 MPG on my trip to Cincy today with my 2012 Crew Cab Hemi (120 Miles)! It was raining and no wind and speed for the most part was kept around 65 mph with some at 55 and as high as 72 MPH. My "07" Chevy on the same route approx same speed was 20.1 MPG. :smileup:
What gear ratio are your running?
 

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That's great to hear. These Hemi Rams aren't quite as efficient as a prius, but a prius is just a little shy of 390 hp. and 407 lb. ft.
 

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Discussion Starter · #7 ·
4X4 Ram Crew Cab

Yes, mine is a 4X4 Crew Cab with a 3.55 rear end. I really didn't baby it that much to get that number. I do like to get into it every now and then but it is nice to know she can put up those type of numbers. I think for a truck this size with that amount of HP is pretty darn good...! Also, I am just running 87 octane. This is one smooth riding truck :smiley_thumbs_up:
 

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22.2 on a CC 4x4 with 120 miles on it... Hmmm. My 2wd reg cab barely breaks 16 running 65 on the interstate with cruise on.
Calculate it by hand after filling it up a few times. 120 miles is not even a third of a tank of gas. I'm guessing reality will put you down in the 16 range like everyone else.
 

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GREAT numbers.

I saw similar numbers on my trip to Atlanta back in July.... it was about 600 miles one way. I averaged 19-20 MPG for most of the way, running 75-80 MPH, but through one section of Abalama and part of Mississippi I got damn near 22 MPG. I was as pleased as you are :D


A note to the doubters... all MPG calculations were done using a calculator


Exco
 

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Discussion Starter · #10 · (Edited)
120 Mile Trip!

22.2 on a CC 4x4 with 120 miles on it... Hmmm. My 2wd reg cab barely breaks 16 running 65 on the interstate with cruise on.
Calculate it by hand after filling it up a few times. 120 miles is not even a third of a tank of gas. I'm guessing reality will put you down in the 16 range like everyone else.
Mine has approx 1,000 miles on it not a 120. The trip was 120 miles all hwy. I am sorry you doubt me but that is the actual number! I also check by hand and find the EVIC system is almost identical to the hand calculation. It is only off from .2 -.4. I have noticed the milage improving as my first trip was to Toledo and the hwy milage was 18.5. No way she is getting 16 MPG on the hwy between 65-70 miles an hour. Maybe the "reality" is your trucks engine is not performing properly, or you broke it in wrong.........!
 

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Mine has approx 1,000 miles on it not a 120. The trip was 120 miles all hwy. I am sorry you doubt me but that is the actual number! I also check by hand and find the EVIC system is almost identical to the hand calculation. It is only off from .2 -.4. I have noticed the milage improving as my first trip was to Toledo and the hwy milage was 18.5. No way she is getting 16 MPG on the hwy between 65-70 miles an hour. Maybe the "reality" is your trucks engine is not performing properly, or you broke it in wrong.........!
I think all Speedfrk is trying to say is, put a few more thousand miles on it and report back to us what you're getting (and how you're driving it). No need to get all defensive.:sad:

My mileage was also all over the place when I had less than 1,000 miles on my '11. In fact, I got more than 18MPG in town early on and now it's settled down to around 16.5MPG with combined city/hwy driving.
 

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22.2 on a CC 4x4 with 120 miles on it... Hmmm. My 2wd reg cab barely breaks 16 running 65 on the interstate with cruise on.
Calculate it by hand after filling it up a few times. 120 miles is not even a third of a tank of gas. I'm guessing reality will put you down in the 16 range like everyone else.
I think if you've been around a few years and have owned several different vehicles, you soon realize that even the same model and equipped vehicle won't always be a carbon copy as far as performance and fuel economy is concerned. Then throw in different weather conditions, driving habits, terrain features, traffic, etc., etc., and I think you'll find very legitimate but often wildly varying fuel economy numbers. This is just not something that can't be qualified over the internet with any exact comparison from owner to owner...but neither is it possible to poo-poo the results of other drivers without basis. I'm sure some are tempted to "stack the deck" concerning their posted fuel economy figures on a forum like this, but I gurantee you that there are some factually correct numbers posted here that are excellent. I was amazed at my last fillup to average 16.9 with 1/3 freeway cruising and 2/3 city. I don't have EVIC, so I've always done it by a small hand calculator kept in the door pocket. I can see this truck easily achieving the advertised 20mpg highway with my results involving this much city driving. My worst tank has been 15.5mpg. As the truck has accumulated more miles and after my intake and exhaust mods, the truck's mileage seems to be slowly creeping upwards with the same driving. Nothing unrealistic about that.
 

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Mileage

Dodge's max mileage for the hemi is 20MPG. That is calculated by the manufacturer under the most ideal conditions available. Level ground, no load, speed limit observed, etc.

They do this so it can be posted with the maximum milege the vehicle is capable of for sales purposes

We have 4 2009 5.7s and 4 2009 4.7s. ALL BROKEN IN BY ME. I own them I need them to last.

Here in NJ we do about 65% city/local and rest highway. The hemis tow trailers about 25% of the time. Heavy loads dual axle trailers carrying boilers, AC units, Chillers, etc.

Having 4 hemis which I have driven all just to see if any are that much better than another one, I find the mileages we get good for what we do with the trucks. When the trucks are loaded with tools and parts, there in not much of a difference, maybe a mpg less. We only have about 800 pounds max under normal conditions. When we tow with the hemi MPG goes down considerable

I drive like an old man, because I am an old man. I can get 21 to 22 on highway no load, 60 MPH cruise calculated as my best max with the MDS on. I have done this at 70MPH same conditions, and none of the Hemis get any better than 18 maybe 19 mph at 70 or over.

Our 4.7s do a bit better on highway same conditions, maybe 1.5 MPH better highway average. The 4.7s get much better "city" type MPH than the Hemi. 5.7s get 12 to 14 mph city best conditions, the 4.7s get 15 to 17 city.I kinda believe that we all hope we are getting better and like to post stories.

But do no let downhill runs, putting tranny in neutral, coasting, and strong tailwinds count.

I have never seen above 21 going over 70MPH with either engine, unless you are adding in the above three things. The only engine mods we have made is drop in K&N air filters.

Now those numbers change with each of our drivers a little, but I am the "cheap" one that wants to see what we can get, so I can advise my mechanics that the numbers are real.

I am not flaming here but just adding the input our trucks get over the last 2 years.
 

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Discussion Starter · #14 · (Edited)
I think all Speedfrk is trying to say is, put a few more thousand miles on it and report back to us what you're getting (and how you're driving it). No need to get all defensive.:sad:

My mileage was also all over the place when I had less than 1,000 miles on my '11. In fact, I got more than 18MPG in town early on and now it's settled down to around 16.5MPG with combined city/hwy driving.
Try to post something positive and it does not take but a few post before it turns negative. It is nice for you to paraphrase it in that manner but that is "not" how he stated it! He is the one that made ref I was not getting this milage...HMMM. Not to mention the fact of his use of "reality". Oh well ..I am done with that BS!

My milage is not all over place. In fact the milage is slowly improving. Why would the milage get worse after time? I am in sales and have had 12 vehicles over the past 19 years. In my experience the milage has always improved after 5,000 miles. If these engines are dropping in MPG there is something wrong. However, this would not surprise me because the last two variable cylinder engines I have had have been terrible. "07" Chevy Avalanche & "08" Honda Accord... I no longer have either one.
 

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Since 2008 the highway cycle has been changed to more accurately represent real world fuel consumption numbers. Most vehicles lost at least 2mpg ( window sticker) when this change happened and the new test is far from optimum for max hw mileage. On a vehicle of this size and weight especially with cylinder deactivation fuel eco numbers can and will vary quite a lot due to driving habits. My computer readout is a good 1mpg (optimistic) off from the actual at about 18.5 for the first 1500 miles with a 2WD Tradesman with 3.55's 90% [email protected] 65-70 mph.
 

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Discussion Starter · #16 ·
Dodge's max mileage for the hemi is 20MPG. That is calculated by the manufacturer under the most ideal conditions available. Level ground, no load, speed limit observed, etc.

They do this so it can be posted with the maximum milege the vehicle is capable of for sales purposes

We have 4 2009 5.7s and 4 2009 4.7s. ALL BROKEN IN BY ME. I own them I need them to last.

Here in NJ we do about 65% city/local and rest highway. The hemis tow trailers about 25% of the time. Heavy loads dual axle trailers carrying boilers, AC units, Chillers, etc.

Having 4 hemis which I have driven all just to see if any are that much better than another one, I find the mileages we get good for what we do with the trucks. When the trucks are loaded with tools and parts, there in not much of a difference, maybe a mpg less. We only have about 800 pounds max under normal conditions. When we tow with the hemi MPG goes down considerable

I drive like an old man, because I am an old man. I can get 21 to 22 on highway no load, 60 MPH cruise calculated as my best max with the MDS on. I have done this at 70MPH same conditions, and none of the Hemis get any better than 18 maybe 19 mph at 70 or over.

Our 4.7s do a bit better on highway same conditions, maybe 1.5 MPH better highway average. The 4.7s get much better "city" type MPH than the Hemi. 5.7s get 12 to 14 mph city best conditions, the 4.7s get 15 to 17 city.I kinda believe that we all hope we are getting better and like to post stories.

But do no let downhill runs, putting tranny in neutral, coasting, and strong tailwinds count.

I have never seen above 21 going over 70MPH with either engine, unless you are adding in the above three things. The only engine mods we have made is drop in K&N air filters.

Now those numbers change with each of our drivers a little, but I am the "cheap" one that wants to see what we can get, so I can advise my mechanics that the numbers are real.

I am not flaming here but just adding the input our trucks get over the last 2 years.
The first satement you make is incorrect. Hemi's don't have a Max of 20 MPG. I have the sticker in front of me. On the Hwy side below the large window MPG number are ("Expected Range for most drivers 15 to 23 MPG") The same thing is also noted on the City side in small print (Expected Range for most drivers 10-16 MPG") The final numbers are averages taken from these two numbers to come up with the large bold numbers on the sticker for both City and Hwy.

Granted... as you noted these numbers are probably taken on the flatest road possible in the best possible weather. Although, I have never read anything on how and where the testing is done. Something I also found interesting on the window sticker when shopping for my truck ... The Ford list "Estimated Annaul Fuel cost based on $3.00 per gallon of gas. The Dodge list the Estimated fuel economy based on gas being $3.85 per gallon. This makes the Dodges fuel consumption cost look significantly higher. I did the math with the Dodge at $3.00 and the Ford Eco would only save you $46.00 per 15,000 miles. Not even a fill up :smileup:
 

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error

The first satement you make is incorrect. Hemi's don't have a Max of 20 MPG. I have the sticker in front of me. On the Hwy side below the large window MPG number are ("Expected Range for most drivers 15 to 23 MPG") The same thing is also noted on the City side in small print (Expected Range for most drivers 10-16 MPG") The final numbers are averages taken from these two numbers to come up with the large bold numbers on the sticker for both City and Hwy.

Granted... as you noted these numbers are probably taken on the flatest road possible in the best possible weather. Although, I have never read anything on how and where the testing is done. Something I also found interesting on the window sticker when shopping for my truck ... The Ford list "Estimated Annaul Fuel cost based on $3.00 per gallon of gas. The Dodge list the Estimated fuel economy based on gas being $3.85 per gallon. This makes the Dodges fuel consumption cost look significantly higher. I did the math with the Dodge at $3.00 and the Ford Eco would only save you $46.00 per 15,000 miles. Not even a fill up :smileup:
OK I see. I though most people would realize I was using the large 20 MPG as the manf states as the highest average(variable) mileage.

And your also correct low as 15 high as 23. Our Hemis go as low as 9 to 10 towing around town and high as 21/22 level road highway not towing.

As far as estimated costs, your right. Too many variables to make a soild claim there.

I am sorta dismayed at these drivers that claim 24+ MPG with a hemi at 75MPH, thats all.
 

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There are tons of variables... the biggest being speed (engine load). I'm an engineer so I understand this a little. Power required increases with the cube of the velocity assuming a constant coefficient of drag-which in this case is almost all aerodynamic because pick-up trucks have the aerodynamics of a refrigerator going down the road. So the power required at 60 mph is much less than at 70 all other factors being the same. This is a good example from Wiki:
Note that the power needed to push an object through a fluid increases as the cube of the velocity. A car cruising on a highway at 50 mph (80 km/h) may require only 10 horsepower (7.5 kW) to overcome air drag, but that same car at 100 mph (160 km/h) requires 80 hp (60 kW). With a doubling of speed the drag (force) quadruples per the formula. Exerting four times the force over a fixed distance produces four times as much work. At twice the speed the work (resulting in displacement over a fixed distance) is done twice as fast. Since power is the rate of doing work, four times the work done in half the time requires eight times the power.
Things like tire pressure (rolling resistance), weather and especially fuel type all have an impact. If you are lucky enough to live where you can get gas without ethanol, you could see at least a full 1mpg increase on a full size truck. If you live in Kansas where it is flat, you will get better mileage than someone in a more mountainous area.
That said, 22mpg with a 4wd full size truck would make it a statistical outlier. Not impossible, but definitely way out there on the bell curve. If you only have 1000 miles on the truck, that should be about 3 tanks of gas- assuming it was full when you picked it up. What is the total average over the 1000 miles or when ever you last filled it up? That will be a much better indicator than using a 120 mile trip.
 
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