Diesel mpg help
Senior User
Joined: Jun 2010
Posts: 161
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My average
I have a 2011 6.7 and I get anywhere between 17.5 and 20 mpg. I recently averaged 18.2 between Toledo and DC. I can get around 23 between Arlington and Quantico.
I just use a little patience and I don't compete with traffic. You'd be amazed how much mileage increases by going the speed limit.
Although I have noticed that there are times that the mileage isn't any different between 70-85. It just depends on the circumstances. In addition, it depends on how often the engine goes into regeneration mode for the exhaust clean-out.
I just use a little patience and I don't compete with traffic. You'd be amazed how much mileage increases by going the speed limit.
Although I have noticed that there are times that the mileage isn't any different between 70-85. It just depends on the circumstances. In addition, it depends on how often the engine goes into regeneration mode for the exhaust clean-out.
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New User
Joined: Oct 2013
Posts: 22
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My truck is a single rear wheel, not a dually. When I first got it, I could get close to 20 buy that quickly faded away. I have been considering putting a tuner on it but with only 9,000 miles I don't want to hassle with ford telling me it's not under warranty
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New User
Joined: Oct 2013
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I generally run slow. I'm that guy everyone gets pissed at for not even driving the speed limit. However this weekend I ran 1800 miles to South Dakota and back. I averaged 14 the whole trip even though I was pushing alittle faster than I normally do.
Lead Driver
Joined: Nov 2011
Posts: 9,544
Likes: 43
I wonder if your fuel filters are clogging? Drive a lot of dusty areas? Maybe your air filter needs replace already? I dunno, weird you could get 20 at one point, seems to be a pretty big variance in mpgs with the 6.7.
Posting Guru
Joined: Jan 2013
Posts: 1,933
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From: VA
With the older diesels that I've driven (7.3s) I've been able to get 17-18 with normal driving, and up to about 22 if I really try (even 23 in a first gen 7.3 PSD). In my experience the 7.3s average better when combining all driving including even when hauling/towing.
If a 6.4/6.7 was modified and tuned in the correct way, I have no doubt that you could do better on mileage. In stock form though, they're not the best.
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New User
Joined: Oct 2013
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There is alot of variance in the 6.7s. Which seems really weird to me. I know that ford doesn't even rate them from the factory
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Posting Guru
Joined: Jan 2013
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From: VA
Person #1: They carry stuff in their truck, run fast, and they beat everyone off the line. They post the lowest numbers
Person #2: They do average driving and post up real world average numbers for normal driving.
Person #3: They are proud of their rig, and post up the MPG number they got cruising on that downhill drive with a tailwind.
Person #4: The "hyper-miler"... They actually do get good mileage everywhere they go, but their numbers aren't good for the average person to go by.
Then there's me who's happy running at 8-12 MPG with my lifted and modified F-350, and proud to say that I drive a gas-hog. haha
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New User
Joined: Oct 2013
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I think that the issues is the different people that post MPG numbers... Person #1: They carry stuff in their truck, run fast, and they beat everyone off the line. They post the lowest numbers Person #2: They do average driving and post up real world average numbers for normal driving. Person #3: They are proud of their rig, and post up the MPG number they got cruising on that downhill drive with a tailwind. Person #4: The "hyper-miler"... They actually do get good mileage everywhere they go, but their numbers aren't good for the average person to go by. Then there's me who's happy running at 8-12 MPG with my lifted and modified F-350, and proud to say that I drive a gas-hog. haha
I was happy with my lifted dodge It was good looking, fast, powerful and still got 18-24 mpg.
Fleet Mechanic
Joined: Aug 2013
Posts: 1,313
Likes: 19
From: Louisiana
I think the variance is with the weight of the foot!! Haha. The difference between going 60 and 70+ is HUGE with these trucks, or so it seems. Also the 6.4 and the 6.7 are completely different. One has twin turbos for one and the other doesn't. I didn't own a 6.4 but everybody I know who did tells me the mileage is bad, so thats all I can go off of. If i'm wrong, please tell me, I don't want to spread false information. Deleting also helps, with an average of 2-3 as thats what most people report.
Mountain Pass
Joined: Feb 2013
Posts: 146
Likes: 21
My truck has been tuned and deleted for 55k. I am using the H&S mini max, it seems to be the most popular along with Spartan. I think H&S is a little more user friendly from what I read, you can adjust on the fly and set your own parameters if you want. I don't have any experience with other tuners so maybe someone else will jump in with some more info.
I am very happy with it. The 6.7 becomes a whole new animal.
plus a nice bump in mpg's. Of course you need to consider warranty and state regulations(yearly emission testing). But I have not read about anyone not happy after they tuned their truck.It is also possible to put a tuner on and leave all the emission stuff, but I don't think guys are seeing near the power or mpg increase that way, also sounds like it causes regens more often.
Hope that helps!
Posting Guru
Joined: Jul 2013
Posts: 1,726
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From: Connecticut
Now a way that you can get "Unbelievable mpg". Find a diesel stop on top of a big hill. Fill it up. Leave the station going down hill wait about a quarter mile and hit the reset. Now do not touch the pedal. Surprise you getting 99.9 mpg. 
Tuned
Joined: Dec 2011
Posts: 302
Likes: 5
Another thing that I have noticed, the "Cleaning exhaust filter / regen " is a very efficient way of wasting fuel.
My 2013 F350 gets about 2mpg less than my traded 2012 F250 did. My 2013 F350 regens about 4 times per tank which I lose about half to one mpg per regen. My 2012 F250 on the other hand would only regen once per tank. I have a hard time making up the lost fuel mpg's due to the regens.
My 2013 F350 gets about 2mpg less than my traded 2012 F250 did. My 2013 F350 regens about 4 times per tank which I lose about half to one mpg per regen. My 2012 F250 on the other hand would only regen once per tank. I have a hard time making up the lost fuel mpg's due to the regens.