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Old 12-22-2014, 06:40 PM   #1
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Ford fuel mileage

Ok, this is sure to be a hot topic but I figured it was time to open a can of worms ....

For those of you with 2012 or newer F350 Dually's , I'd be curious to know what speeds and mpg you get. I've now towed my 36RL about 15,000 miles total. Have been in all kinds of terrain other than the western mountains (hopefully this summer for that ).

In my truck with the 3.73 gears and in regular conditions, ie rolling hills , mostly semi flat, no mountains, I get a consistent 10.3 -10.5 mpg when running 68 mph. I find in mine, if I run slower, say 62-63, I actually lose about .4 mpg. If I run 70, doesn't seem to change any.

I haven't tried going considerably slower as here in the North East you would get run over and off the road by Semis. If you don't run with the traffic you literally take your life in your hands.....

As the saying goes, your mileage may vary, but I'm curious what the others are seeing.
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Old 12-22-2014, 06:45 PM   #2
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Vaughan - you mean towing, correct?
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Old 12-22-2014, 06:58 PM   #3
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This year we've logged about 8,000 miles towing, I typically drive at about ~65mph, really focus more on the tack and keep it at ~1,700rpm and we're averaging 10.2 mpg. I'll experiment at a little faster speed to see what happens over the next couple of months.
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Old 12-22-2014, 07:07 PM   #4
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SO many variables for mpg...

How much wind, how hard you accelerate and decelerate, the grades you go on, wheel alignments, bearings, are brakes dragging?, tire psi, etc....

My fall back on the mpg question of want a big truck and want to pull an rv?

get a vehicle that will do it and the mpg is what it is
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Old 12-22-2014, 08:15 PM   #5
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Quality of fuel makes a big difference on the diesels as well as the wind. The sweet spot on my truck seems to be around 1800 RPM with 373 rears.

With that said, I always weigh in my head what time I have to get somewhere and how much that 1.5 mpg is really costing me if I go that extra 5 per hour.
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Old 12-22-2014, 08:24 PM   #6
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I don't fall into your 2012 or above classification but with my 2011 6.7 engine I have averaged right at 11.2 over about 30k miles. Depending on wind, hills, and traffic as low as 8.5 and as high as 13. Also a 3.73 rear end.
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Old 12-22-2014, 09:19 PM   #7
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I'll keep it simple...11mpg for me.
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Old 12-22-2014, 09:28 PM   #8
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So what are you guys doing to get over 11mpg, how fast do you drive, which differential do you have, any mods to your trucks?
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Old 12-22-2014, 09:54 PM   #9
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I'm sure if I slowed down, I'd do better than 11mpg it's just that the truck wants to run at least 70mph.
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Old 12-22-2014, 10:23 PM   #10
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Vaughan, with 31SL in tow, weighing in at 14,760, 23,865 gross 3:73 gears, my computer states 9.8 - 10.4, I drive 65-70 all over VA including areas west of Afton Mtn. Empty I average 15.3-16.8.
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