What kinda towing Mileage are you guys seeing? Going from North Dakota to Las Vegas I was averaging about 7 miles per gallon in a 30 mile an hour head winds going through Montana and when I turned and started heading south I reset the meter and am now averaging about 11mpg. Towing 9000 pounds or slightly under 5th wheel camper. My 2010 F 150 with a 5.4l pulled the same camper around North Dakota flatland no wind and got about 12 to 13 . I was expecting the diesel to be a little better granted not against 30 miles per hour. Though I will say the 6.7 liter does not slow down for Hills, haha! Both trucks have 3.55 gears.

 

I had a 2006 f-150 and pulled a 9000 pound fifth wheel with it and i was out by Minot lots never once did i see 12 to 13 with it was more like 7 or 6. Now woth my 6.7 its 13 or 14 all the time pretty much and no they dont slow down for hills lol

 

wow, my old 5.4 barely got 12 empty. what was i doing wrong..

 

I gotta say, from all the OP's posts that I have read to date, you may want to consider going back to the F150 because it was superior to the Superduty in just about every way. I gotta agree with acf6, most people don't get much better than 12-13 mpg empty with a 5.4 F150 with average driving. You're going to have a hard time convincing me that the 150 got that kind of mileage towing 9,000 lbs unless it was on the downhill portion of a mountain!

7 mpg for the 6.7 is pretty low. Towing my high profile 37' fifth wheel toy hauler that weighs between 15,000 & 16,000 depending on where we are going averages 8.5-9 mpg at 70+ mph. Even on trips with a lot of mountain towing I haven't seen less than 8 mpg. Before the toy hauler I had a 30' fifth wheel that weighed about 8,500 lbs and got 11.5-12.5 mpg towing it. I would expect your setup to net somewhere around 11 mpg at least but a 30 mph head wind will put a lot of extra load on the engine. Even so, 7 seems pretty bad.

 

Is this MPG over a tank or are you resetting it while driving?

The ecoboost doesn't even do that good with that kind of weight.

 

I never said that. The f150 is sweet for sure but the super duty is superior, no doubt about it. The 2010 5.4 is also far superior to older versions of the engine. I averaged 16-17 empty. I live in a rural area so 90 percent of my driving is highway and the gear ratio is 3.55. Makes a little difference. I love my 6.7 Platinum though. Just expected a little better towing mpg and wondered if my results were normal or not. I get 18-19 empty. Just put a tuner on it and she freakin rips. Can't wait to delete emissions. Mphs should improve then.

 

Was that 7 mpg over 1 trip or multiple trips? I'm thinking the wind had a big play in your mileage. When ever there is a strong wind I notice a large decrease in fuel mileage.

 

Also my 5.4 2010 F150 got 16-18 mpg on the highway with 3.73 gears

 

I used to have a 2010 F-150 with 5.4L & 3.55 gears that got 18-19 mpg unloaded hwy, and about 8 with a 6500lb TT. I upgraded from there to a 2011 F-250 w/ 6.2L & 4.30 gears that got almost 9mpg towing the same trailer if I used ethanol-free gas (closer to 8 with normal). When I bought my 2013, 36', 8200lb (dry) TT, that mileage dropped to about 8.

Upon upgrading to my 2013 6.7l w/ 3.55 gearing, my first tow was a 2500 mile x-country move from TN to CA (right down the 40) loaded up to almost 20k CVW. Into a 20mph average wind, and uphill from TN to the continental divide, I saw about a 9mpg average. Honestly, I was a bit disappointed until I took all the other factors into consideration.

Now that I'm settled in CA, I'll usually average around 11-12 round trip loaded up for a normal camping trip. Considering that is almost 50% better than my 6.2L, I have no complaints about towing.

Now if I could only get my average unloaded regen frequency up over 100 miles (yes, when not loaded I'm in regen 10% of the time), I'd be REALLY happy.

 

1 trip. First time I pulled anything with it. From North Dakota to Las Vegas. All through North Dakota and Montana I was fighting 20-30mph headwinds driving 70mph. Averaged 7. Maybe 600 miles or so. Wind was brutal, totally killed mpgs. Was hittin 24psi boost up some Hills but never lost speed, haha! I reset the meter when I turned South by Bozeman and quit fighting the wind. Went through West Yellowstone and down through salt lake city. Was averaging 11mpg when I got to Vegas. 70-75mph, 1500 miles total. Much less wind not sure of direction, up and down mountains. Likely get a little better in flat North Dakota maybe.

 

Aerodynamically, the engine is pushing 90-100 mph of wind across the truck and trailer (20-30 mph headwind and 70 mph road speed). It is impressive to me that these things handle it as well as they do. That kind of speed - even empty - kills MPG.
I also had a 2010 F-150 with 5.4 that got me an average of 16.5 combined, 19 hwy, 14 city, but hooking up my 10k tt dropped the hwy to 7.5 mpg.

 

I never saw below 8 towing with my f150 in wind, but I only towed it a few times one summer, probably around 800 miles total that summer. The table top flatness of ND really helped though. She ran 2100 rpm at 65 in 5th gear all day long until you hit the rare small Hill from time to time.

 

I have a 8000 enclosed car hauler that have towed with both my F150 5.4 and my f350 6.7 same trip Ohio to Road Atlanta The F150 was 7.5 to 8 GPM at 80 mph and the 350 is 10 to 11 same speed same trip.

and the 350 is way more comfortable and of course powerful

 

I would suggest you go back to a F 150 and be happy.

 

Not discrediting you SG, but I just can't believe that a F150 got better mileage then the new trucks with the same load, unless of course there was no load. Even then I would still challenge that the 6.7 will get better mileage then it.