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6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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Old 02-22-2012, 10:58 AM   #1 (permalink)
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No PS fuel mileage experience

My truck, 2011 F-250 6.7 Power Stroke,4x4, 6.5' bed, 20" wheels/ 3.53 ratio. This is an account of a 1892 mile trip from South GA into Northern PA and return on the same route. I filled with fuel at home before leaving and set my trip meter, I kept all fuel tickets on the trip and filled at the same pump when returning home. Upon returning the truck has just over 11,000 miles on it. The trip was ninety percent interstate with driving at 74 MPH, good portion of terrain was mountainous. My total mileage on the trip meter was 1892 miles, the computer calculated 18.6 MPG. I actually used 102.57 gals of fuel according to my fuel tickets. Dividing 1892 miles by gals used (102.57) = 18.446 MPG actual.
Hope this info might be helpful to anyone with doubts about the 6.7's ability to get good fuel mileage.
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Old 02-22-2012, 12:02 PM   #2 (permalink)
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What surprised me is that my new truck gets 16mpg around town and 15.5 running 80 down the highway in a rainstorm on cruise.

I'm thrilled with the 16, but not so much with the 15.5.

All according to the lie-o-meter (though I am keeping logs and they match.)

Have just about 800miles on her now.
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Old 02-22-2012, 12:36 PM   #3 (permalink)
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2012 F-350 4x4 mileage

I have a 2012 crew cab, short bed 4x4 6.7 powerstroke with 3.53 gears, and average around 16-17 mpg when I am running about 65-75 mph. I have pulled out an actual 19.5 mpg (truck computer showed 20 mpg), but I was running around 50-65 mph with it. Usually when I get 16-17 mpg with it, the truck computer is showing about a mile more per gallon more than it actually is. I don't rely on the truck computer for my mileage, and do the math myself. I only have less than 2K miles on it so far and am hoping to squeak out at least 20 mpg sometime. I had an 05 F150 4x4 with an edge programmer, a lift kit, and 35" tires, and was lucky to get 13.5 mpg out of it on a very good day. Hope this helps.
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Old 02-22-2012, 02:10 PM   #4 (permalink)
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I have found the truck's mpg computer to be pretty darn accurate including the gallons used in the trip meter which I reset each time I fuel up. With 12,000 miles on the odometer my lifetime mpg average is 14.96mpg (Light towing and I have a heavy foot). You can check out the data in the link in my signature. For a copy of the spreadsheet just click File|Download as.
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Old 02-23-2012, 06:47 AM   #5 (permalink)
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The fuel mileage computer and gallons used on my truck are so accurate I don't bother to hand calculate anymore. It is off a statistically insignificant amount. Even when I drove 600 miles on a tank - it was still within .1 gals.

TrickTruck - I, too, find that 80MPH driving provides a MPG result equivalent to city driving...
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Old 02-23-2012, 08:52 AM   #6 (permalink)
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I have found the truck computer to also be pretty dang close to my hand calcs. Never off by more than .5 mpg. As Dak said..."statistically insignificant".
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Old 02-23-2012, 10:05 AM   #7 (permalink)
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My truck's computer is off by almost 2 mpg. Towing it would show 12+. Hand calc to 10.5. Just finish a 500 mi each way trip @75mpg. Truck showed 18-20mpg. Calc to an average of 17mpg.

Gets about the same as my old 7.3 towing and close to it empty on the hwy. No complaints.
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Old 02-23-2012, 03:45 PM   #8 (permalink)
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Quote:
Originally Posted by newptken View Post
...The trip was ninety percent interstate with driving at 74 MPH, good portion of terrain was mountainous. My total mileage on the trip meter was 1892 miles, the computer calculated 18.6 MPG. I actually used 102.57 gals of fuel according to my fuel tickets. Dividing 1892 miles by gals used (102.57) = 18.446 MPG actual.
Hope this info might be helpful to anyone with doubts about the 6.7's ability to get good fuel mileage.
Quote:
Originally Posted by gtwt View Post
I have a 2012 crew cab, short bed 4x4 6.7 powerstroke with 3.53 gears, and average around 16-17 mpg when I am running about 65-75 mph. I have pulled out an actual 19.5 mpg (truck computer showed 20 mpg)...
Quote:
Originally Posted by doczenith1 View Post
I have found the truck's mpg computer to be pretty darn accurate including the gallons used in the trip meter which I reset each time I fuel up...
Hey guys,

Im really glad to see all the great stories about good fuel mileage.


Quote:
Originally Posted by TrickTruck View Post
What surprised me is that my new truck gets 16mpg around town and 15.5 running 80 down the highway in a rainstorm on cruise.

I'm thrilled with the 16, but not so much with the 15.5...
TrickTruck,

Did you check with the dealer about the mileage? I have your VIN from previous messages so drop a line via PM if youd like help.

Cory
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Old 02-23-2012, 10:25 PM   #9 (permalink)
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My truck (even with the Titan 50 gallon tank and the truck reprogrammed to accept its larger size) is almost always +- .5 mpg....

That includes mileage left as well!!!

Pretty good if you ask me....
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Old 10-14-2012, 09:44 PM   #10 (permalink)
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My 6.4 w 3.55s consistently got more consistent fuel mileage and overall better. I fuel up at the same stations and drive w cruise on the interstate 75-80 mph. My mileage varies from 13-16.6 all time best. In town I'm lucky to get 14. My dash computer is consistently off .75-1.5 mpg and the trip mpg reads 2-2.5 mpg higher than actual. Also my 6.7 has a tonneu cover. I've been driving w cruise and noticed mpg falling without indication of regen and reset to see as low as 10 on the dash. Truck has no power in 6th. Up to 65mph the dash shows better milage in 5th. I've also had the front drive shaft fall out driving down the highway at 800 miles and had transmission stick in first gear. Oil temp runs significantly higher than 6.4s. I've seen 216 cruising 75 empty. Truck looks to be nicer but I regret trading in my 2009. I cannot wait to part ways with my 6.7. Seems like mpg varies truck to truck. If its a concern test drive several and buy best.
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Old 10-15-2012, 07:48 AM   #11 (permalink)
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Well, I took a trip to San Antonio this weekend (from Houston area). I only managed to get 20.1 mpg on the way there. It started out better, but I picked up a headwind shortly after getting out of the Houston area. On the return trip, I managed 21.5. That's down from my near 23mpg on my last trip, but still pretty good.
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Old 10-16-2012, 11:12 AM   #12 (permalink)
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Hey guys,

Im really glad to see all the great stories about good fuel mileage.



TrickTruck,

Did you check with the dealer about the mileage? I have your VIN from previous messages so drop a line via PM if youd like help.

Cory
I'm with TrickTruck....my mileage is in the ditch once i get on the highway.So far i hand calc at 13.5 to 14 doing a solid 65 unloaded.City stop n go is 12...thats to be expected.I think i totally messed up when i traded in my 2005.It's to late now i just have to deal with it .

As far as taking it to the dealer....what are they going to do.I can already see the look on their face when u go in and complain about fuel mileage on an f350.I had a hard enough time trying to get them to find and fix a sensor problem.I'm also on the border weather to keep this truck or get rid of it.It sounds nuts i know but i'm really thinkin about it.I've never spent so much on a vehicle and was so disappointed.
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Old 10-16-2012, 12:12 PM   #13 (permalink)
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Quote:
Originally Posted by TrickTruck View Post
What surprised me is that my new truck gets 16mpg around town and 15.5 running 80 down the highway in a rainstorm on cruise.

I'm thrilled with the 16, but not so much with the 15.5.

All according to the lie-o-meter (though I am keeping logs and they match.)

Have just about 800miles on her now.

Little science here: there is a big difference in economy between 75mph and 80mph (I know this is harped on in this forum) .

Power consumed due to drag is a cubic function (with respect to velocity):



What that means is for each mph faster, the power required (and fuel burned) is exponentially greater (to the power of 3)

Seldom do I actually get to use my engineering education!
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Old 10-16-2012, 12:13 PM   #14 (permalink)
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Man yalls truck needs help badly.if your driving 65 on highway.i dont understand why your not close to 20 mpg. Ive been in alot of these that dont ever come close to that crappy economy.
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Old 10-16-2012, 05:19 PM   #15 (permalink)
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I have to agree, I've picked up several of these and drove them across the country. A shorter drive might show 14-16 mpg. But if I drive far enough the avg climbs.

80 mph = 18 mpg over a tank of fuel. Unless you are climbing the entire trip. I've driving from SLC to Bozeman which is up and over the continental divide and it's read 16 mpg, But as soon as I head out across Montanas flats, I'm back to 18 mpg. The dash computer in my personal truck is pretty accurate. In fact I often use the trip meter reading to know how much fuel I will take in at fuel stop. It's rarely off my .3 of gallon for 30 gallon fill up.

I don't see any better mpg with the 6.7L than I did with my 6.0L when it comes to towing. 11-12 mpg with most trailers. The big difference is when you get into 6th gear and hold the 1600 rpm for long time. Then the 6.7L returns better mileage than the 6.0L
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