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Old May 1st, 2009, 09:05 PM   #41
Fullsize4life
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My 08 F350 4x4 dually w/4.10's gets an average 11.6. It is a noticeable difference from my old 85 6.9 getting 15. But it is a pulling machine! It drives the same loaded or unloaded.

Milage is my only complaint about the truck.
I think im getting better with the 6.9 now. After adjusting the fuel and adding some more oil to the fuel im getting lots less smoke and more mph.
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Old December 20th, 2009, 09:38 PM   #42
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banks six gun kit is ur best bet if u bont want much smoke at all. sct is a great company and all they deal with is ford so they know what they are doing. i have been told by a ford mechanic that every chip is supposed to void your factory warrenty even if you take it out when you take it in they will find out that the computer has been tampered with. also check with your dealer just because ford says that it voids your warrenty doesnt mean that your mechanic will tell them you have a chip.right now in the country if work comes in there gonna take it. ahve fun with the new truck and get rid of that exhaust asap!!
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Old December 20th, 2009, 09:41 PM   #43
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He has had the Spartan tuner on it for months and has been tearing up tires ever since
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Old January 5th, 2010, 07:43 PM   #44
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I have a few friends that have 6.7L cummins crew cab 4x4's and the mileage sucks on them too. If you want to get some mileage you have to get that DPF off from your truck....check out spartentechdiesel. Matt has a tune thats making 500+RWHP from the 6.4L with just tuning and removing the DPF/DOC. Not to mention most guys removing the DPF's are getting in the 17+mpg range. Same goes for the 6.7L its a turd for fuel mileage as well. But I have heard several people getting much better mileage once they remove the dpf and block EGR coolers.
the 6.7s are a great damn motor my buddy gets 22mpg with his on the high way and 15 in town. and for those who are gonna ask, well whats all done to it: 6 in rough country lift, 37x12.5x17's cooper stt's, chip, strait piped 4 in exhaust with dpf delete, sb cold air, south bend dual disk clutch, and i cant remember what else right now. and it tows like there is nothing behind it
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Old February 3rd, 2010, 10:28 PM   #45
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the 6.7s are a great damn motor my buddy gets 22mpg with his on the high way and 15 in town. and for those who are gonna ask, well whats all done to it: 6 in rough country lift, 37x12.5x17's cooper stt's, chip, strait piped 4 in exhaust with dpf delete, sb cold air, south bend dual disk clutch, and i cant remember what else right now. and it tows like there is nothing behind it
well that goes against all of what the forums say and several of my friends 6.7ls. Im sure its a very nice truck though. The cummins is a bad motor!

I got 35mpg the other day with my 6.4L pulling 15k through the rockies
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Old February 3rd, 2010, 11:13 PM   #46
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well that goes against all of what the forums say and several of my friends 6.7ls. Im sure its a very nice truck though. The cummins is a bad motor!
lol. Please explain.

I'm not gonna bash either motor. Any of the '07 and newer engines are basically the same routine; in order to be reliable and get somewhat acceptable mileage, you gotta remove the DPF and EGR. The 6.4s proved to be a pretty awesome motor and are proving to be capable of making upwards of 600hp with just a tune, deletes, intake and exhaust, which is pretty incredible. I think it's turned out to be a great motor. However, there are some incredibly strong running 6.7s out there too, with just the same basic mods. The 6.7 ran into some issues with the DPF and EGR as well at first, just like the Job 1 6.4s. I can't wait until the 6.7 Powerstroke comes out. It's going to be rather interesting...
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Old February 4th, 2010, 06:04 AM   #47
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well that goes against all of what the forums say and several of my friends 6.7ls. Im sure its a very nice truck though. The cummins is a bad motor!

I got 35mpg the other day with my 6.4L pulling 15k through the rockies
well do you believe everything you read? come down here to ohio and we will show you a 6.7 that gets 22 on the highway. it all depends on how it is built.
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Old February 4th, 2010, 07:18 AM   #48
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do you even know how to calculate fuel mileage?
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Old February 4th, 2010, 07:37 AM   #49
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lol. Please explain.

I'm not gonna bash either motor. Any of the '07 and newer engines are basically the same routine; in order to be reliable and get somewhat acceptable mileage, you gotta remove the DPF and EGR. The 6.4s proved to be a pretty awesome motor and are proving to be capable of making upwards of 600hp with just a tune, deletes, intake and exhaust, which is pretty incredible. I think it's turned out to be a great motor. However, there are some incredibly strong running 6.7s out there too, with just the same basic mods. The 6.7 ran into some issues with the DPF and EGR as well at first, just like the Job 1 6.4s. I can't wait until the 6.7 Powerstroke comes out. It's going to be rather interesting...
When I wrote the cummins is a bad motor, I was saying it in a good way. Lots of potential.
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Old February 4th, 2010, 07:40 AM   #50
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When I wrote the cummins is a bad motor, I was saying it in a good way. Lots of potential.
Understood. I just misinterpreted.
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Old February 4th, 2010, 07:44 AM   #51
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well do you believe everything you read? come down here to ohio and we will show you a 6.7 that gets 22 on the highway. it all depends on how it is built.
no I dont believe everything I read. When I post mileage results its not good ole boy redneck numbers. Its legit. I have owned 2 duramaxs (LB7, LLY), 2 6.0L powerstrokes, and now my 6.4L. I love tinkering with diesels, and trying to get the best fuel economy. The duramaxs from all of the research and personal experience I have had by far get the best mileage. I dont believe there is a 6" lifted 37" tire 6.7L that gets 22mpg hand calculated....NOT A CHANCE. Now if you were saying you got the numbers from the lieometer in the truck then, yes I would agree. My 05 duramax 6" lift on 35s would say I could 25-28mpg on the lieometer....hand calculated was a best of 20mpg that was drafting off from a semis bumper at 62mph. I can get my 6.4L to show a tanks fuel economy at 25mpg but best hand calculated to date is 18.9Mpg. I understand you can build a truck for fuel economy, but a truck with 37s and 6" lift is not.
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Old February 4th, 2010, 07:55 AM   #52
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no I dont believe everything I read. When I post mileage results its not good ole boy redneck numbers. Its legit. I have owned 2 duramaxs (LB7, LLY), 2 6.0L powerstrokes, and now my 6.4L. I love tinkering with diesels, and trying to get the best fuel economy. The duramaxs from all of the research and personal experience I have had by far get the best mileage. I dont believe there is a 6" lifted 37" tire 6.7L that gets 22mpg hand calculated....NOT A CHANCE. Now if you were saying you got the numbers from the lieometer in the truck then, yes I would agree. My 05 duramax 6" lift on 35s would say I could 25-28mpg on the lieometer....hand calculated was a best of 20mpg that was drafting off from a semis bumper at 62mph. I can get my 6.4L to show a tanks fuel economy at 25mpg but best hand calculated to date is 18.9Mpg. I understand you can build a truck for fuel economy, but a truck with 37s and 6" lift is not.
I'll have to agree. If there's one thing I learned over the years with diesels, people like to lie to themselves when it comes to mileage. My last 7.3L with an 8" lift on 37"s got about 14 mpg on the freeway cruising at 75 mph. Now given, the 7.3L has never been the king of fuel mileage, but still I don't care what kind of tunes you're running. A lifted truck will just not show the kind of mileage people like to claim.
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Old February 4th, 2010, 08:02 AM   #53
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I'll have to agree. If there's one thing I learned over the years with diesels, people like to lie to themselves when it comes to mileage. My last 7.3L with an 8" lift on 37"s got about 14 mpg on the freeway cruising at 75 mph. Now given, the 7.3L has never been the king of fuel mileage, but still I don't care what kind of tunes you're running. A lifted truck will just not show the kind of mileage people like to claim.
exactly Im glad someone is honest about fuel economy. Man I have done so many tricks to get fuel economy with diesels, and a lot of them help to get you higher mileage. Like last weekend I pulled my enclosed 21 ft snowmobile trailer (loaded weight 6k lbs) I was pulling it fast like 80mph. I was running my spartan 250 tune, and I got 10.2mpg(hand calculated). Well some jerk off with a lifted cummins dually told me he just pulled at 80mph pulling 8klbs and got 15mpg. No offense to cummins lovers, cuz its not just cummins guys that lie about fuel economy, its people in general are ignorant and have no clue. I have a buddy with a 6.4L on 37s, 6" lift with a spartan 310 tune and tells me he can get 21-22mpg. BULL CRAP!
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Old February 4th, 2010, 08:49 AM   #54
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exactly Im glad someone is honest about fuel economy. Man I have done so many tricks to get fuel economy with diesels, and a lot of them help to get you higher mileage. Like last weekend I pulled my enclosed 21 ft snowmobile trailer (loaded weight 6k lbs) I was pulling it fast like 80mph. I was running my spartan 250 tune, and I got 10.2mpg(hand calculated). Well some jerk off with a lifted cummins dually told me he just pulled at 80mph pulling 8klbs and got 15mpg. No offense to cummins lovers, cuz its not just cummins guys that lie about fuel economy, its people in general are ignorant and have no clue. I have a buddy with a 6.4L on 37s, 6" lift with a spartan 310 tune and tells me he can get 21-22mpg. BULL CRAP!
Just about every new diesel owner refuses to believe that their truck doesn't get 25 mpg. The best I've seen out of my 5.9 on 35"s was about 19 MPG taking it incredibly easy on the highway with my Comp box on 1 and the fueling turned all of the way down. A while back, some guy on cummins forum was trying to convince people his truck got 26 mpg. When he got called out, he came back and claimed he got 22 mpg "hand calculated" and was all upset that his mileage was so poor. I just laughed.

In all honesty, the best mileage I've ever seen came from my dad's old '02 Duramax. That truck could get around 20 mpg on the highway on stock tires. Now my '99 7.3 rolling on 44"s... I don't even want to talk about that.
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Old February 4th, 2010, 09:22 AM   #55
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Just about every new diesel owner refuses to believe that their truck doesn't get 25 mpg. The best I've seen out of my 5.9 on 35"s was about 19 MPG taking it incredibly easy on the highway with my Comp box on 1 and the fueling turned all of the way down. A while back, some guy on cummins forum was trying to convince people his truck got 26 mpg. When he got called out, he came back and claimed he got 22 mpg "hand calculated" and was all upset that his mileage was so poor. I just laughed.

In all honesty, the best mileage I've ever seen came from my dad's old '02 Duramax. That truck could get around 20 mpg on the highway on stock tires. Now my '99 7.3 rolling on 44"s... I don't even want to talk about that.
My 02 duramax with PPE hot ET I got 20MPG as well. Granted that was with a sled in the bed, and 60mph easy driving. Same conditions this year I got 19mpg with my 6.4L with a sled in the bed and a spartan 250 tune (60-65mph).
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Old February 4th, 2010, 08:46 PM   #56
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My 95 12valve will pull 20 mpg plus in the summer on the highway. Best i got was 22.4 average for a tank with no load, i run 285-70-17s. It does have a few mods but nothing to make huge power.
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Old February 4th, 2010, 09:52 PM   #57
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do you even know how to calculate fuel mileage?
IQ / ii x miles drove x gallons used
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Old February 5th, 2010, 10:32 AM   #58
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he just drove it back from his farm in pa which is 985 miles round trip. and doing 70 the whole trip he averaged 20 and that is also what his overhead display said. now before you say," oh its lifted and has bigger tires, it has to be off" the new black maxx programmers let you go in and change all of that info to compensate for the tire sizes.
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Old February 7th, 2010, 07:28 PM   #59
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i have seen as high as 600 miles to a tank in my cummins once. 23 gallon tank.

600/23=26.086

i have never seen that again.


i see an average of around 400-450 a tank right now in the cold or pushing my v plow.

thats still 19.565 when im running down the high way where my truck spends alot of time.

with the plow on all the time i will get around 17.5 or so with a 9.2 v plow.

in the summer running down the highway i will get on average 24mpg. some will call it bullshit but id call it lucky. its not un heard of to pull that kinda mileage in a 24v cummins
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Old February 8th, 2010, 11:26 AM   #60
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i have seen as high as 600 miles to a tank in my cummins once. 23 gallon tank.

600/23=26.086

i have never seen that again.


i see an average of around 400-450 a tank right now in the cold or pushing my v plow.

thats still 19.565 when im running down the high way where my truck spends alot of time.

with the plow on all the time i will get around 17.5 or so with a 9.2 v plow.

in the summer running down the highway i will get on average 24mpg. some will call it bullshit but id call it lucky. its not un heard of to pull that kinda mileage in a 24v cummins

I have never heard of a 23 gallon tank in a dodge diesel?? Mine has a 32 gallon tank. Also, would not believe that mileage unless I scene it myself jmho.
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