idrive

iTrader: (3)

Crew FX4 with the 6.5" bed is the granddaddy of the F150. IF I remember correctly the highway speed is close to 53?mph as tested. Generally speaking you exceed 60-65 the mileage starts to drop. 75-85 it just plain sucks. As mentioned earlier, idling, extended time warming the truck are huge mpg killers as well.

tvsjr

My truck is currently showing 11.6mpg. I have yet to tow a single thing. Other than the topper and bumpers, it's pretty much stock (build thread has pix), but both to kill the aerodynamics pretty badly.

It's also driven around town quite often and used as a fire department response vehicle... so the turbos are well-exercised.

Rjfm1972

F150_Lariat_Luv

I also owned a GM 5.3 V8 and similar to your experience, my 2005 Z71 crew cab Silverado would achieve 18ish if I was very very careful and stuck to 67-70mph. I don't mean to offend... just to say these trucks are not 'that' much better on the highway than anything else produced in the last 10 years, and actually worse around town if you have a really heavy foot (you do not). In my 12 month experience, to achieve the advertised mileage you have to use an incredibly light foot and avoid anything above 65 or so. Maybe the 2wd trucks are better, I don't know. But in my experience, 65ish is the hard line where mpg starts dropping for the common 4wd pickup with frontal area similar to ours, it's likely simple physics. I run some very frequent highway segments and can say that I barely cross 22 if I run state highways at 55-65, better than I recall the Silverado achieving, but on the interstate at 70, 18mpg is a challenge and that is precisely what I could achieve with the Chevy.

But the current truck offers way more capability, technology, and the additional power is pretty nice too.

Rjfm1972

Mb1500

leckbandg

Winter in town 12.5mpg
Summer in town 14.5mpg
I own a 3.5 ecoboost 6.5 bed Fx4 with a full set of toolbox's mounted and loaded (about 1100 lbs)
Summers open road 18mpg
I should add I do not try to always get the best mpg ... this truck is just to much fun to drive
Also I have never figured out my mpg by pen and paper ... the lie-o-meter is good enough for me

Rjfm1972

CurryBob

I've had 3 of the 3.5 EB F150s. 13-15 and now the 2018. They have all been close to the exact same MPGs for me except I get right at 2 MPG better on the 2018. I average almost 24 straight highway and 21-22 with mostly local rural roads some small town traffic. Winter time with more shorter trips and more around where I live with some town traffic has rarely dropped below 19 mpg. I always use a top tier fuel gas station but never over 87 Octane, I have the 36 gallon fuel tank and almost never get below 1/2 a tank. Currently have about 9500 miles, I'm retired and use my truck to pull my boat a lot. I also have a muscle car to play with so the truck is not my only vehicle I have and I've owned it since Sep 2017, so around 15 months.

I never reset my trip-2 screen so I would have my overall average for the life of my ownership of the truck. There is suppose to be a screen somewhere that showers how many miles drive with a trailer attached and could not find it but think the trailer may have to be connected, not sure. Last time I saw it was almost 30% of my total mileage if I remember correctly.

I calculated my MPGs for around 3 months to begin with on all 3 of these vehicles. Some would be anywhere from .5 to 1.2 MPG off one way and then a little off the other way. After 3 months of checking both ways and average them all out, the truck computer was only off 0.03 MPGs from me doing on a calculator. This was only about 1500 miles for me but was close enough for me. I don't live in a large city so we don't have a summer gas but we do have winter gas.
One thing I noticed, the truck would be slightly higher if I filled up at 3/4 of a tank and slightly lower when I filled up at 1/2 tank. Not every time but that was one thing I noticed.

scottinmt
You are getting worse now than what I get pulling my Ranger base boat which is almost 5,000 lbs. I average right around 15 mpg towing my boat. I don't know what part of the country you are in and everyone deals with winter gas I would think but for the life of me I don't know how I could even make my truck get that bad of gas mileage. I would think you would need to have it check out soon.

scottinmt

Thanks Bob, I appreciate your input. Btw, I'm in Montana