Cruising on the highway @ 65-75 mph it usually hovers anywhere from 17-20 mpg.

Around town its 14ish.

Hand calculated all my tanks so far (except first one) and average is 17.5, computer calc is pretty spot on as well.

No tow numbers yet.

F250, SWB, CC, 6.7 w/ 3.55s

 

I get 13-16 driving like a fool. my worst was 11 best was 16.4 so far with just under 2000 miles on the 6.2. and 3.73s

 

13.7 lifetime average mpg for the first 10,000 miles before Trip B resets. Now I'm at 12k miles, so about 2k more on a fresh Trip B lifetime reset. It reads 13.4mpg average. BUT...it's a 3.55 diesel dually and it tows a lot.

I've seen 20.6mpg on a 200 mile trip driving gently, unloaded (well, 3 adults), on 'ideal' 55mph roads.

 

I got into my 2017 Super Duty diesel from a 2014 F-150 Limited with an Ecoboost that got around 22/23 MPG. I just returned from a 2100 mile trip and only got 17.3 MPG at 70 MPH in my new Super Duty with 3.55:1 gears. I guess that may be considered decent fuel mileage but with 10 MPG differences it has taken some getting used to along with the added cost of diesel compared to gasoline.

 

6.7 CCSB F250 3.31 geared 240 miles

Only driven to work so far, 45 mph speed limit, multiple traffic lights... no freeway miles yet.
Not hand calculated yet
Up until yesterday, 16.8 mpg on dash, then a prompt for a regen ( I have Operator Commanded regen)... went down to 15.3 mpg after regen.

Speaking of the regen, holy crap! It took the RPM's up to 2k, (it sounded like it was revving alot higher than that), and the heat coming out of the exhaust was crazy. I think the neighborhood thought I was trying to blow it up!

 

Bigger usually comes at some sort of cost.

 

Some people drive fast some people drive slower drive 80 miles an hour and you can't expect to get 18 and 19 miles to the gallon if you drive 60 - 70 speed limit you can expect to get 18-20 on the highway without towing anything. People get what they get. If you always on the throttle and in the turbo boost towing or not you're going to get absolutely crappy fuel mileage if the driver treats everything like a drag race and driving 80 miles an hour when the speed limit is 75 then expect to get Low fuel mileage I don't get why people
on here don't believe these trucks can get good fuel mileage. Take your foot off of gas pedal more and see what happens

BTW. I have a 17 CCSB 6.7 F250 4x4 with 37 inch tires and I average 17 with mixed driving and 21+ on the highway going 5 under posted speed limit.

 

Somewhere between 10K and 15K is when I noticed the mileage getting better. Last tank mostly 55mph back roads it came in at 20.1 highway running 70 it will sit right around 19.3. Hook the bass boat up and it settles in the 17s and with the gooseneck hauling the tractor (~12.5K load) it gets in the mid 15s to low 16s depending on hills.

 

I just drove 1800 miles total from west Michigan to Williamsburg VA .
I drove 65 to 70 mph as much as I could allot of construction and traffic jams��
The truck average was 19mpg.
F350 6.7 CC long box 3.55
Very happy with the truck��

 

That's what she said.

 

I got a 6inch lift with 37s

and 3.55 rear. Stock I was getting 17.7 mpg now it dropped to 16.4 mpg it prolly will
drop more but I'm not a heavy foot driver. I'm going to be ordereding the stealth module soon to hook up into the fuel pressure sensor and it will be un detectable and gain 100hp 120 torque and 10-20% mpg gain

 

More times than some driver consider, fuel mileage is affected by driving habits, not to mention modifications. Quicker acceleration, jack rabbit take-offs along with start and stop traffic. Regional altitude, topography and fuel used are also contributing factors. I'm a very conservative driver and have only been able to get 18.3 MPG at 60 MPH. My last trip at 70 MPH achieved only 17.3 MPG. Most of the lower fuel mileage I got on my trip I would contribute to the 3 major city's that I had to drive through. I'm sure if my entire 2100 miles was all non-stop open highway mile my fuel mileage would have been much better. All of that is considering that my truck only has 4600 miles on it now.

 

My '17 6.7 SCSB w/ 3.55 stock 20" tires and wheels with 1000 miles so far of 60% highway @speed limit getting 17.2mpg (on dash). I put on a 2" level kit at about 500 miles. Prior to level kit was getting 17.4.

 

Lot's of threads on this here... I do know the 'search' is kinda lame too.

 

f350 srw 6.7 4x4 3.55, 14.0mpg lifetime, 6200 miles on the clock


my dad's f250 set up the exact same way is getting right at 15


i've also got a full 75gal nurse tank that rides around in the back of mine all the time. other than that both have about the same amount of weight in tools, probably 3-400lbs