I have about 1500 miles on my truck so far and I track MPG through actual calculations and the fuel meter on the truck I have to say the one on my truck is very accurate.

Now my question. With a couple of hundred miles I made a 30 mile trip on the freeway with cruse control on and set at 72 MPH and twice got over 19 MPG on that route. I have since went over the magic 500 miles where the rest of the engine is set loose and I do feel like there is more power (real or imagined?) but now on that same route, I only get 16 MPG with the same cruse at 72. I even now have a BakFlip which should be more efficient.

Anyone have any similar experiences?

2017 F350 SB 6.7

 

Different fuel, maybe the weather, could be a few things that could effects mpg.

 

Noticed same same, so have others I know...

Here is my thinking: Ford inserted a line of code in the ecm that gave it an initial mpg to base future calc on. This skews the early mpg higher early on.

People check their mpg most when they first buy.

 

Is the 500 miles really a thing? I test drove one with 20 miles, and one with 550 miles, and I swore the higher mileage one was much faster. Same axle.

 

I was wondering if in the initial de-tune would account for the better milage. If so, in most cases, I would rather have the better MPG and then switch to the more powerful/less MPG when I'm towing and need the extra horses.

 

I'm at 4200 miles on my '17....and so far...I'm disappointed with the mileage i'm getting. Yeah...I've done a few highway trips and did see 17 a few times...but not 18 yet. It's the around town driving that is the biggest difference. My 2011 got 15 to 16....ALL THE TIME....EVERYTIME....just doing the work/school/store type of driving. And with the 2011 on the highway...non-stop....I would occasionally see 19+. I'm surprised this new truck is giving me mid 13's to 14 doing the same type of driving. Is it the increase in HP and Torque that is giving me these numbers? I'm driving the exact same that I drove for the last 4 Superduties. I'm not a lead foot/fast accelerating driver is what I mean. I'm a pretty smooth driver...as my kids can attest after riding with grandpa...LOL. Anyone else just a bit let down with the numbers....overall...not just one road trip on the highway or only two weeks of driving on the new truck??

 

So odd, thats such a far cry from here: Ford Super Duty is the 2017 Motor Trend Truck of the Year - Motor Trend

MPG: 16.4/23.7/19.0 mpg

 

I don't believe the 6.7L will be broken in until 15,000 to 18,000 miles at best - it takes 40K to break in a 13L - 15L new diesel motor - We should all start looking at our fuel economy at higher mileage to see if there is any improvement - hopefully we will see 16+mpg city stop and go and maybe 18/19+mpg at 75mph type driving with cruise control not pulling a trailer of course

 

Plus when spring/summer comes around your mpg will go up cause summer blend diesel gets better mpg than winter blend.

 

I'm showing 16.1 on my trip 1 mpg indication and it's never been reset. I got 19.2 mpg on 150 mile trip in a snow storm in 5" of light powder doing between 55 and 65 in the mountains. 3.55 gears. I'm loving the fuel economy on this thing.

 

My 3.55 dually lifetime average is now down to 13.9 in almost 5,000 miles. I'm not doing anything different than I did in my 2016 SRW 3.55 truck...which had a lifetime of over 16mpg...but this is a dually and running winter fuel.

I have hit 20 mpg on 55mph trips.

I'd bet mpg rises after my first oil change...mpg always seemed to drop as the oil aged in my past diesels.

 

Yes, I read this article and couldn't believe the mpg numbers they got. Nor the 0-60 times. I think Ford gave them deleted 6.7s to test!

 

I've been disappointed so far. No real highway miles and I haven't towed yet, but I've got 700 miles on my 3.55 SRW and so far I've averaged upper 12's. That's about the same as my '08, 6.4L. I'm hoping it's just not broken in yet.

 

700 miles it pretty green. On my 2016, I saw my best mileage in the first 500 miles. It really depends greatly on how you drive them.

 

I have about 4500 miles on her so far, installed 285-75-18 toyo at2's at 251 miles and speedo is set within less than 1% off
These are all hand calculated and usually within 3 tenths of the dash figure
637/46.28=13.34mpg-about 1k lbs half the tank, city highway 19 hrs on truck
624/39.91=15.63mpg- about 1k lbs half the tank, highway 31hrs on truck
453/30.24=14.98mpg city highway 44 hrs on truck
637/38.46=16.57 mpg highway 60 hrs on truck
595-36.19=16.44mpg mostly highway 74 hrs on truck
397/25.39=15.64mpg city highway 82 hrs on truck
658/41.56=15.84mpg city highway 95 hrs on truck