soonerjoe

I just had a chance to drive both ecoboost 4x4 trucks. 3.5 one was a Lariat 4x4 loaded with most options. 2.7 Was a loaded xlt 4x4. I reset the trip meter before each drive. If you like to drive pretty hard the 2.7tt is the way to go. I drove both trucks very hard and got 16mpg in the 2.7tt vs 11mpg in the 3.5. I think real world numbers will be quite a bit better for the 2.7.

My brother did the exact same thing and got 17mpg for the 2.7tt vs 12mpg for the 3.5tt.

Curmudgeon

I'm a conservative driver (no towing, no commute, mixed suburban & highway driving) who wonders whether a 2.7 or a 5.0 will deliver the best MPG for my 4x4 Screw. Any recommendations?

GearheadGeek

Post again when you've got 500 miles towing a 5500 lb tandem-axle Airstream with each. Preferably somewhere like Arkansas, Appalachia, the mountain West, etc.

zx12-iowa

Pressing the pedal hard =different results between those two engines. The 2.7 can't match the 3.5 in power and performance. So you would drive easier in the 3.5 or 5.0 over time and take less of a mpg hit. My guess is you drove it like you stole it.

brulaz

I find the EPA hwy correlates well with my conservative, mostly rural driving. If your driving is similar, according to the EPA you will get the same mileage (23 mpgUS) in a 4x4 from any of the engines, except the 5L which will be worse.

Definitely a 2.7L EcoB will do better than the 5L V8.

But if you want the really good mileage, you'll have to downgrade to a 4x2. I bet they put some really fuel efficient All-season tires on those to get their numbers.

snirtman

I drive a 3.5 eco now and was shocked at how close the 2.7 was in performance. ..almost equal. ..

soonerjoe

I did drive it really hard! But I did that with both of them. We will see when the numbers hit, but right now most Eco guys are getting 16mpg with a 4x4 and I bet they will get 20+ with 2.7 and maybe 17 with the 3.5.

Just a guess....

brulaz

With the EPA numbers, for a 4x4 there's no diff in hwy and combined mileage. City is 1mpg diff.

The big differences only happen with the 4x2 for some reason (gearing, tires, weight vs boost needed to get it through the test, dunno)

Platinum T.C.

Mileage,
If you look at the 2015 F-150 Brochure, Booklets they show the Mileage for a TWO wheel drive using 93 Octane.
Have to read the small print at the bottom of the page?
Here in Colorado we have 85--87--& 91 Octane.
I haven't seen any higher Octane for a good number of years.

brulaz

The numbers are on the EPA site now. Pretty sure they're all regular gas.

For 4x4, the Hwy and Combined are identical for the two EcoB engines. City is 1 mpg less for the 3.5L EcoB.