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Old 06-29-2016, 10:41 PM   #91
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3.31 gears, which is one reason I think I should get a little better running empty. It has 18" wheels and that combination is equivalent to 3.55 gears with 20" wheels. I did all of the calculations on that before I purchased it. Especially coming from 4.10 gears in my 95 and 97.

AL
3.31 is good around town but not so good towing at highway speeds.. The higher the ratio the better the highway towing fuel mileage..
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Old 06-29-2016, 10:58 PM   #92
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I got 3.55s in my 2016 F350 dually 4x4. I can get 20-21 cruising at 60-70 if I'm nice to it.
I would check your spec sheet again...3.55's aren't available on an F350 dually...only 3.73's and 4.30's.

I have a 2016 F350 dually as well with 3.73's and get 11-12 towing 15k.
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Old 06-29-2016, 11:08 PM   #93
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Something to remember on these newer diesels is that they all inject fuel and DEF downstream to keep the particulate filter temperature up in order to burn off the black soot that used to roll out the tailpipe. So a percentage of your fuel consumption is used meeting EPA emission standards and not producing horsepower.
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Old 06-29-2016, 11:21 PM   #94
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Something to remember on these newer diesels is that they all inject fuel and DEF downstream to keep the particulate filter temperature up in order to burn off the black soot that used to roll out the tailpipe. So a percentage of your fuel consumption is used meeting EPA emission standards and not producing horsepower.
You are partially correct...extra fuel is only used during a regen cycle and is not injected into the exhaust system. DEF is injected into the exhaust system and its only purpose is to reduce NOX emissions. I don't know about Duramax or Cummins, but during a regen, the Powerstroke injects extra fuel in 1 bank to boost exhaust temps to burn off the soot.
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Old 06-29-2016, 11:46 PM   #95
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3.31 is good around town but not so good towing at highway speeds.. The higher the ratio the better the highway towing fuel mileage..
I think 3.31 is the highest gear ratio available on a Super Duty, but I had lots of opportunity to play around last year on a 5,000 mile trip, so I would run one tank in tow/haul in D, and the next tank in tow/haul but locked the transmission into 5th max. This would give me the RPM equivalent to running 3.73 gears - didn't make any difference in mileage.

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You are partially correct...extra fuel is only used during a regen cycle and is not injected into the exhaust system. DEF is injected into the exhaust system and its only purpose is to reduce NOX emissions. I don't know about Duramax or Cummins, but during a regen, the Powerstroke injects extra fuel in 1 bank to boost exhaust temps to burn off the soot.
I am using a 7" tablet with BT OBDII and Torque Pro to monitor the regen cycles and other stuff. While towing I am getting regen around every 250 miles for about 12 minutes. You can definitely see the increase in fuel usage.

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Old 06-30-2016, 12:10 AM   #96
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I have no complaints about the power, ride or handling but for me the fuel mileage is just not there.

AL
My brother has the same complaint about his identical Ford. If he avgs 12mpg he's excited. He got so disgusted he put a delete kit on it. Vast improvement in mileage and power and no more def crap. Now he avgs over 23 mph. When it's time to trade he will just put the original crap back on... or for major warranty work. But he also owns a farm with several mechanics
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Old 06-30-2016, 03:12 AM   #97
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Well, maybe I'm the exception because I drive like an old man, because I am one. With my 2012 6.7 Diesel F250 SD 4x4 Crew Cab, I average 21 mpg empty and 15 mpg towing my Toy Hauler which weights in at about 9500 lbs loaded. Now that's on flat ground. Up the Cajon pass I drop to 11 mpg. 9.5 mpg if I lay into it.
I have to snicker when I pass gassers climbing the Cajon grade, they're engine screaming so loud that I can hear them over my 6.7 cruising along at 1700 rpm.
I've had diesels in trucks for about 10 years. Power to tow, and gas mileage wise.... I'll never go back to gas. A couple years ago the wife got a 328D. So now we're both diesel dazzlers.
If I wanted a toy truck to move my friends with, I'd get a gasser.
Otherwise, once you tow with diesel, ya never go back to gas.

Now, i do love my Ford, but if I could just get the Ford truck, with the Cummins diesel, and the Chevy Allison transmission...... HEAVENLY.
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Old 06-30-2016, 06:24 AM   #98
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I would check your spec sheet again...3.55's aren't available on an F350 dually...only 3.73's and 4.30's.

I have a 2016 F350 dually as well with 3.73's and get 11-12 towing 15k.
your right. I knew better than that.
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Old 06-30-2016, 09:01 PM   #99
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That surprises me too Al. I would think you should get a little more. I have a friend pulling a Landmark 42' with a 2016 1 ton GMC club cap getting 20 empty 13 pulling. He is very heavy with that Landmark.

I have a 12 Silverado SRW 3500 4/4 and I have never got 13 mpg pulling a 35ft Cedar Creek, but I don't really care, when tank gets empty I put in more fuel.


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Old 06-30-2016, 09:11 PM   #100
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I have a 12 Silverado SRW 3500 4/4 and I have never got 13 mpg pulling a 35ft Cedar Creek, but I don't really care, when tank gets empty I put in more fuel.


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