by hand calc, i am only averaging 16.5, but now that i just passed 1200 miles it jumped up to around 18, ecoboost, crew, 4x4, 3.73ls, but as a comparison my old truck 2007 5.4 crew 4x4 3.73ls i was averaging 16.5, but that was after i passed 30,000 miles where it jumped from 15mpg, give it time

 

The sound you are hearing is the fuel injectors opening and closing your truck has 2 fuel pumps electric and mechanical makes a lot of psi for the DI

 

The ecos improve with miles. It's heavily documented in the forums. Everyone's guess is that it has to do with the engine's ability to learn.

 

I easily average 19-21 mpg on the freeway. Heck my lifetime average is 19.4 and that includes a trip about 5hrs each way towing 2 atvs and a bunch of camping gear. I have 2100 miles on mine.
Supercrew, 3.55, 6.5 bed.

 

Also has to do with when the engine is fully broken in. Due to the turbos, direct injection, and slightly higher compression ratio, the engine actually behaves more lake a diesel. Mileage getting better as the engine gets more hours on it is the norm for a diesel but it's usually over a period of the first 100K miles before everything is properly seated. The EB I would guess would be about 35-50K before everything in them becomes properly seated.

 

Seriously, you buy a truck for gas mileage? If your worried about mileage get a prius.
The vehicle tested was a 2wd model.
Are you light on the gas or a lead foot ?

My 4.6 averages about 17.6 after 250 miles of driving. I'm light on the gas and I'll using mt tires and carry 300# of tools

 

All about the torque. Look at full sized truck engines, and you will see the more efficient ones make more torque at lower revs like what you'd see at highway speeds. The 4.6 for example, only makes about 230 lb-ft at 2200 rpm, which isn't really enough torque to push the vehicle down the highway and through the wind. Now look at the EB, it peaks out at 420 lb-ft at 2500 rpm and makes about 380 lb-ft at 2000 rpm (which is generally considered highway speeds). Everyone who uses their truck for work knows the best engines for pulling have more than 300 lb-ft of low end torque. That is one reason why diesels are great for pulling and why many of the HD truck engines can blow the EB out of the water when it comes to mileage.

 

It never said he was or was not towing a trailer. The torque won't matter to me if i am not towing or pushing anything other than the weight of my own vehicle.

 

Even empty, it makes a difference. Empty common rail diesels can make an easy 22-30 mpg depending on the engine and set up, all because of that low torque curve and the ability to put as much force against the ground at as slow of engine speeds as possible.

 

X2

No way to tell without this information.