3.5 EB Real World MPG

gtotco

Member
Joined
Apr 5, 2021
Messages
5
Reaction score
3
Location
Colorado
Vehicles
2021 F-150 Lariat 502A FX4 3.5L
I had been super unhappy with my mileage initially, but I must say its gotten quite a bit better as we move out of winter in Colorado.

Quick background - live in Denver but we have a mountain house about 150 miles from here that we drive to on most weekends, which is the primary use of the truck. Drive is basically all 2 way road but at 70mph, and includes two passes > 10,000 ft. I'm running Wrangler Duratracs for the snow, and use premium gas (Colorado regular is 85 and Costco only sells 85 and 91 - no mid tier to get it over the recommended 87). Even with Premium in the tank most of the winter round trip to the house was getting between 17 and 18. Now that the weather is warmings up its typically 21 and 22 on the same trip. I'm curious how things will go as the weather improves, but the truck definitely seems to be burning less now that its being driven in 50 degree weather instead of 20. I think being able to run it in 2H all the time instead of 4A in the snow probably also has an impact.

Anyway - just thought I'd share. I drive in a mix of normal and eco, but have a pretty light foot (I typically just leave the intelligent cruise control on at 5 over the speed limit which is typically 65mph + 5mph = 70mph) though passing on a two lane highway I'll floor it so as to minimize the time driving into oncoming traffic and will hit 85 or 90 during passes, but don't cruise at that speed. If this trend continues into summer I wouldn't be surprised if it gets up to the 23mpg advertised. On a flat run around Denver on a 50 or so degree day right after I bought the truck I got 25mpg with the OEM A/T tires. I think the Duratracs probably drag it down a bit due to how soft they are.





Advertisement

 

jayfitzy

New member
First Name
Jason
Joined
Mar 14, 2021
Messages
3
Reaction score
5
Location
Athol, MA, United States
Vehicles
2021 f150 STX
Occupation
Maintenance Test Pilot
Wow, I must have a fluke but my Supercrew STX FX4 with 3.55 gears riding on stock 20 inch wheels I am getting consistently 23 mpg. I just added a Lomax Tonneau cover and I have already seen a increase in mpg.
 

dhectorg

Active member
Joined
Feb 23, 2021
Messages
44
Reaction score
19
Location
USA
Vehicles
2022 F-150 Lariat 502a Supercab Sprt 4x4 3.5 EB
Occupation
IT
I'm glad I read this thread before committing to the 3.5 because the numbers I see here just won;t cut it for me. I drive around 25000 miles per year, mostly highway, and good fuel economy is my top priority. I prefer the design of the 2.7 anyway, but I was concerned that it wouldn't be enough to handle max GVWR in challenging situations, such as mountain passes. I'll probably order a 2.7 XLT supercab with the payload package.

As a side note, it would be helpful to know whether people are quoting mileage reported by the vehicle or if they are calculating it manually because the truck's computer simply is not accurate. Whatever it shows, the actual number is almost certainly worse.
 

LocStar320

New member
First Name
Scott
Joined
Mar 23, 2021
Messages
4
Reaction score
1
Location
Winter Garden, FL
Vehicles
2017 F150 XLT 302A, 2021 F150 500A on order
Has anyone figured out how to get into Engineering Test Mode on the 21? I adjusted my 2017's MPG displays (Lie-O-Meter, and both trips) by calibrating the AFE Bias.
 

gtotco

Member
Joined
Apr 5, 2021
Messages
5
Reaction score
3
Location
Colorado
Vehicles
2021 F-150 Lariat 502A FX4 3.5L
Wow, I must have a fluke but my Supercrew STX FX4 with 3.55 gears riding on stock 20 inch wheels I am getting consistently 23 mpg. I just added a Lomax Tonneau cover and I have already seen a increase in mpg.
Yeah - I think with stock tires and driving in 2H it seems pretty easily achievable as long as it’s relatively flat. I don’t know what the STX comes with for tires stock by the OEM Wrangler tires on my Lariat FX4 were actually pretty good on gas. The Duratracs I put on to get a winter rating - not so much.
I'm glad I read this thread before committing to the 3.5 because the numbers I see here just won;t cut it for me. I drive around 25000 miles per year, mostly highway, and good fuel economy is my top priority. I prefer the design of the 2.7 anyway, but I was concerned that it wouldn't be enough to handle max GVWR in challenging situations, such as mountain passes. I'll probably order a 2.7 XLT supercab with the payload package.

As a side note, it would be helpful to know whether people are quoting mileage reported by the vehicle or if they are calculating it manually because the truck's computer simply is not accurate. Whatever it shows, the actual number is almost certainly worse.
FYI last one I did was manually and it was actually higher than the trip computer by about .5mpg, for whatever that is worth. I usually fluctuate +/- .5mpg but literally YMMV.
 

flatag

Well-known member
First Name
Tom
Joined
Feb 25, 2021
Messages
71
Reaction score
69
Location
Florida
Vehicles
2021 Ford F-150 XLT FX4
Just one tank to go by but the computer says 17.5 mpg and I calculated 20.1 mpg on a bone stock truck driving in suburban setting.
 
OP
21CaliPlatEB

21CaliPlatEB

Well-known member
First Name
Mickle
Joined
Sep 26, 2020
Messages
457
Reaction score
498
Location
West Sacramento
Vehicles
2021 Ford F150 Platinum 3.5EB FX4
Occupation
Neonatal Respiratory Therapist
getting 19-20 driving 62-65 mph on mostly flat highway and 20% city. 34” nittos
 

jfdube999

Well-known member
First Name
Jean-Francois
Joined
Nov 11, 2020
Messages
284
Reaction score
110
Location
Montreal, Qc
Vehicles
2021 F-150 Platinum 4x4 FX4, 2020 Edge Titanium, 2019 Escape Ti, 2019 Mustang GT PP2
14.4 mpg 87 octane on my (stock) Platinum 3.5L EB in stop and go Montreal traffic. Not good, but what do you expect in a big city.. Truck is brand new with about 500 miles on it. Hope it gets better after the break-in.
 

Klitz

Well-known member
Joined
Apr 5, 2021
Messages
46
Reaction score
40
Location
Texas
Vehicles
2008 4.6l supercab, 2021 5.0l supercrew
Has anyone figured out how to get into Engineering Test Mode on the 21? I adjusted my 2017's MPG displays (Lie-O-Meter, and both trips) by calibrating the AFE Bias.
Basically the same procedure as the previous generation. I did it last weekend.

Edit: I changed mine to 954, it was at 1000
 
Last edited:

Bryan Simon

Well-known member
First Name
Bryan
Joined
Sep 16, 2020
Messages
912
Reaction score
598
Location
San Antonio, Texas
Vehicles
65 Ranchero, 66 ElCamino, 05 Ranger, and more
Occupation
Maintenance
I would have expected better from the v6
I have a v8, 4x4, 3.31, 8ft box SuperCab.
Just under 1000mi and have a lifetime avg of 18.9
About half at around 75/80, and the other half 35-50.
Little city traffic, mostly rural
little update on the v8 overall mileage
im on my third fill up at just a hair under. 2000mi.
lifetime avg is now showing 19.7 on the dash.
the other monitor showed 20.3 for that tank.
actual mileage for the last tank came out to 19.6. About 3/4 of a mile different from what the dash told me.

still creeping up albeit slowly.
 

Old fart

Member
First Name
Doug
Joined
Feb 21, 2021
Messages
18
Reaction score
9
Location
Minnesota
Vehicles
2005 F150 Lariat, 2018 Explorer, 1975 John Deere
Occupation
Retired
Just curious, are most of you with the 3.5EB using regular (87) or premium (91) octane. Owners manual sort of hints at a preference for 91. Just wondering if it makes that much difference? I'm still on my first tank of gas and I'm assuming the dealer didn't spring for premium. Still getting 20 mpg.
 

Flasniper

Member
First Name
George
Joined
Nov 18, 2020
Messages
19
Reaction score
33
Location
Florida
Vehicles
2005 Ford F250
Occupation
Management
Just curious, are most of you with the 3.5EB using regular (87) or premium (91) octane. Owners manual sort of hints at a preference for 91. Just wondering if it makes that much difference? I'm still on my first tank of gas and I'm assuming the dealer didn't spring for premium. Still getting 20 mpg.

I am here in South Florida, which is a totally different climate then Minnesota. I have tested both 87 and 91 with little to no difference. 1/2 to 3/4 mpg. running 18.4 city and 20.1 Hwy.
South Florida is already on the Summer blend, so that could make a difference.
 

Flasniper

Member
First Name
George
Joined
Nov 18, 2020
Messages
19
Reaction score
33
Location
Florida
Vehicles
2005 Ford F250
Occupation
Management
14.4 mpg 87 octane on my (stock) Platinum 3.5L EB in stop and go Montreal traffic. Not good, but what do you expect in a big city.. Truck is brand new with about 500 miles on it. Hope it gets better after the break-in.
I feel your Pain. My first 1000 miles in South Florida was running 15 mpg. Now I'm close to 4000 miles and starting to see 18.4mpg. In the City I find mpg better using the Eco.
 

jfdube999

Well-known member
First Name
Jean-Francois
Joined
Nov 11, 2020
Messages
284
Reaction score
110
Location
Montreal, Qc
Vehicles
2021 F-150 Platinum 4x4 FX4, 2020 Edge Titanium, 2019 Escape Ti, 2019 Mustang GT PP2
I feel your Pain. My first 1000 miles in South Florida was running 15 mpg. Now I'm close to 4000 miles and starting to see 18.4mpg. In the City I find mpg better using the Eco.
Haven't tried Eco yet. Guess it's time or else I'll have to mortgage sth in order to afford all the gas lol!
 

gtotco

Member
Joined
Apr 5, 2021
Messages
5
Reaction score
3
Location
Colorado
Vehicles
2021 F-150 Lariat 502A FX4 3.5L
Just curious, are most of you with the 3.5EB using regular (87) or premium (91) octane. Owners manual sort of hints at a preference for 91. Just wondering if it makes that much difference? I'm still on my first tank of gas and I'm assuming the dealer didn't spring for premium. Still getting 20 mpg.
I use premium but only because I’m in Colorado and regular is 85 here. Since Ford seems to suggest 87 even at higher elevations I figure play it safe and pony up for the good stuff. 87 technically exists at mid grade but Costco doesn’t carry it and their often doesn’t seem to be a huge price difference between 87 and 91. I’ve lately been getting 22 to 23 highway and 20-21 overall on mostly highway driving with about 4000 miles on it, after being in the 18-19 highway 17 overall range for most of the winter when the truck was brand new. I’ve been running premium the whole time so not sure if it has the most to do with engine break in, weather (including not having to run in 4A regularly for snow), or wearing some rubber off the Wrangler Duratracs I have on it but have definitely seen good improvement over the last few months.
 

Advertisement





 


Advertisement
Top