Slowtrucker

Don't let him know why you say idol time...

GreySVO

Hi all, I knew that parts that will generate efficiency and get rid of parasitic losses would get me better mpg, and I found a good mix. I got 19.6 pure highway mileage with the 5.4 engine at around 72 mph average, and I did check my speedo / odo. Mods performed:
- BBK Throttle Body & 0.98v TPS
- BBK Underdrive Pulley Kit
- K&N Cold Air
- Superchips Tune
- Electric Fan Kit Conversion
- '04 Cobra Water Pump
- Removed 2 of 4 cats
- Cat-back exhaust
- All Royal Purple Fluids
- Full tune-up

At 70 mph before mods, I could tell the truck was feeling a little challenged to go faster, but now, at 80, it feels effortless. These were all good mods.

AeroCare

Idol time?

AndySTX

I've been surprised by my mileage on the '18, 5.0. I've put about 1,200 miles on it and right at 22mpg with probably 20% City and 80% highway driving. I assumed having the line-X sprayed and adding the F1 tonneau might drop it just a hair but it's still at the same.

I will say I never speed, stop and start easy, love the stop/start feature, so my driving habits probably maximize my mileage. I was 'hoping' when I bought it I would get 20mpg average so I'm definitely satisfied.

DK in NC

Keep in mind if your 22 mpg is what the dash is telling you then it's likely not that in reality. I've never had a car that was accurate with that calculation. I just filled up my 2018 for the first time yesterday and while the dash readout was telling me I got 19.1 mpg, the actual came out to be 17.9 mpg.

Eduskator

2017 3.5EB 4WD / Super Crew / 3.55 / 157'' wheel base:

All time average after 5000 miles tracked in 7 months using fuelly: 14.7MPG (60% city 40% highway)
MPG Average this winter : 11.75
MPG Average last summer: 16.8
Worst MPG : 9.22 (2 full weeks of -30 to -40f temperatures)
Best MPG : 20.45 (first ride, 95% highway)

Computer MPG has always been 2MPG higher than my real consumption.

AndySTX

Yea, admittedly I haven't calculated it using gallons/miles per tank. What I am comparing it to is the mileage that used to show on the dash on my previous vehicle, a 6 cylinder Challenger. On that car I was showing 27mpg or so. To be within about 5mpg on that, definitely satisfied. I was expecting it to be showing about 19-20.

AeroCare

I did a test with pictures and posted it on a thread in the newer trucks section. https://www.f150forum.com/f118/my-mp...up-now-410774/

Eduskator

Your computer obviously shows great number, but they're not really relevant. I could go on a perfectly flat freeway and run the test for a few miles and would probably get the same numbers, but they wouldn't be relevant at all for me since most of my use is 60% city and 40% highway.

Did you fuelup after each tests to make sure that real consumption was the same as shown on the computer? We can't compare oranges with apple, that thing is a lie-o-meter, trust me! At the end, what matters is how much money comes out of your pocket every time your fuel up, not what's shown on your screen.

AeroCare

It seems like you just looked at the pictures and didn't read the entire thread because the answer to your question and your objections to the tests and results were covered over there already.

I disagree with your statement about the dash numbers not being relevant, they are to me and to where and how I drive. Of course if you drive in mountains or exclusively in the city then you'll never see numbers like this, that's why everybody does their own calculations.

The purpose of the pictures was not only to show the total MPGs that were achieved but more to show how just 10mph difference can affect the MPGs so dramatically, and that applies to everyone no matter where they drive.