So I was averaging 15.9 mpg, but im now seeing 16.2 (lifetime). Is there some break in period that the computer changes about 5k? I don't think that I'm driving any differently.

 

Ford says you'll get better mileage around that point. Obviously it varies with how one drives it but a brand new truck is not going to perform as well as one with 5k on the clock. The difference you state seems reasonable for that.

 

Around here winter to summer fuel will cause that mileage change lol....

 

On my third tank of gas. I've already noticed improvements after 1200miles. I'll get 22-24mpg around 65mph. 75mph gets ~20mpg. To be honest i'm thrilled with that

Thats probably up 5%-10% from first couple tanks.

 

Seems all the Ford diesels tend to get a little looser and mileage improves around 20K miles or so. My two previous seemed to follow the same pattern. But right now I am getting about 15.9 myself.

 

6,000 miles and no improvement.

 

Yep...same here. Just turned 6000 and my 2011 was 3-4 MPG better at this same point. And...oh yeah.....I still drive the same.....

 

im almost 7000 miles, nothing has changed with mine, usually 15.8-16 unladen

 

My 2004, 2008, and 2011 all had no change in mileage from day one. My 2017 is now around 9800 miles and still same mileage. Average of 14.7.

 

8,000 miles and it seems to be stuck on 15.7.

 

just turned 800 miles getting 17.5 around town, I know alot less when I tow with her. my 14,15, never got better than 15.5 less when towing. but I sure did not buy them for the milelage,

 

Ya, I did not get it for the milage either, but I just find it odd that it is increasing.

 

I don't know that many Mikes yet.

 

2015 with 16,000 miles and no difference from the day I bought it.

 

With all the electronics controlling all aspects, I don't see where there is a mileage break in point anymore.