Home Forums Gear Hunting Trucks and Four-Wheel Drives 2018 f150 3,5 ecoboost findings

Just posting up my last trips actual driving in my 2018 F150, 4x4, 3.55 gears, all stock, 3.5 twin turbo ecoboost, crew cab 5.5' bed from Cheyenne to Post Falls ID and Yelm WA.
I did not tow or carry a load in bed, besides a jerry can.
2605 miles round trip, all at an average of 73 MPH, just about all on cruise control and AC on.
Burned up 139.1 gallons regular gas. Gas was from a low in Livingston MT at 3.18 to 3.45 in Post falls ID.
19.05 MPG averaged with last fill up in WY. 36 gallon tank
Drove great and no issues at all. I have a tad over 57,000 miles on it as of today.
Dont believe what the trip gauge ever says as its always off by 1.5 to 3mpg.
It read a high of 24.3 in WA to a low of 17.7 from Post Falls to Missoula.
Going to Post Falls from Cheyenne I averaged 20.1 mpg total, same from Post Falls to Yelm.
All my low MPG was my trip back, thus effected my total average.
Steady winds from ID to WY was at 25 to 45mph, all side winds, so that had a effect on MPG.
Going up to ID weather was nice and calm.
Truck pulled great in all the mountain passes, up and down.
At 73 mph I get my best mpg overall and I am not racing with others as I like the in between space this way with no having to pass, speed up or slow down.
My highest speed was at 80 mph to pass a bunch of drivers who just could not keep away from clogging the road up, passing me, slowing down and all over with other drivers. I don't need to fly down the road my self.
Hope this helps any 3.5 drivers or looking to buy a F150 with such motor.

That's about 3.5 mpg better than my 2016 toyota tundra would have gotten on the same route, or about 20% better. I love my tundra, but hate the fuel mileage.

I get close to that in my 2020, same engine, 4x4 with 3.55 gears and factory tires. Drove to Alabama and back last month and kept it under 76mph on Interstate, around 60-65 on other highways. Some running around town for a few days while I was there. Computer said 22mpg average for the trip, and I have found it to usually be about 1mpg above my hand calculations. I drive a fair bit of highway every week, generally at 60-65mph, and my readout generally hangs around 22mpg for the mixed driving of a 36gal tank. More like 24mpg if it is straight 60mph highway trips with no load. I find it fairly impressive, considering the size of the truck and the power. The turbos are sometimes audible when I hit hills, and this often results in the truck staying in 10th gear instead of downshifting. The truck will likely get a winch guard in the next few months, along with some lift spacers to keep the front end near factory height. I expect to lose a bit of MPG as a result. If I bump up to a slightly taller tire when these wear out, I'm sure that'll cost me a bit too.