I've read numerous threads about EcoBoost fuel mileage and invariably someone points out that an EcoBoost motor doesn't reach it's full fuel economy potential until it has at least 10,000 miles on it.

So, what's different on an EcoBoost than on any other internal combustion engine mfg'd these days where it needs 10,000 miles to achieve mechanical happiness?

 

Don't know but I call BS on those claims. I'm on 34k and haven't seen any mpg improvement since new.

Maybe it takes some guys 10k miles to learn to drive a EB to get good mpg.....

 

Let me guess, you bought a 6200 lb Screw 4x4 with the max tow and 3.73 gears and you expect 21 MPG's.

As my truck was gaining miles, the MPG's increased incrementally and finally peaked at about 8000 miles.

Let us not forget, winter blend fuel is not too far away and that will adversely affect your mileage. Weight, tire size, terrain, region and driving habits all play a part in any trucks performance and fuel economy.

 

Perhaps I wasn't clear. I'm skeptical of a mpg bump after 10k miles, not mpg's in general.

I did not see any mpg improvement since new.

But because I bought a SCREW with 3.55 axle and 4x4 and got sticker mpgs, I'm not worried. Yes, I was able to get 21 hwy, until I put my new AT tires on. I haven't really tracked my hwy mpg since I got the new tires, but my avg went down almost a full mpg, so my best guess is I lost at least 2 hwy.

 

I don't think that it'll take that long to break in. The ECU definitely has to adjust over time, but there's no way a modern engine and ECU would take 10k miles to adjust.

 

I'm at 58,000 and haven't seen a bump in mileage. I think the 10,000 mile thing is urban legend.

 

I think theres one thing that we can all agree on, we've established that the ecoboost is a love it or hate it program.

With the new power numbers for 2015, the 5.0L got some badly needed respect from ford. Unless the ecoboost came free in my next truck, I wouldn't pay for the engine. The only future advantages will be the extra 1000 lbs of towing over the 5.0L and towing at elevation. Unless Ford has found the silver bullet that reins in consistent ecoboost MPG's like I'm getting in my 3.31 geared truck, it's simply not worth it.

 

Maybe an economy mode button, something that can maybe open the waste gates to avoid boosting when it isn't really needed.

 

Hey Fellas,
Purchased my 2013 Eco 4x4 Scew with 3.31 gears in December 2013. I have 10,400 miles on it now. I get about 22ish straight highway. Which is an increase in MPG from my old 2002 Dodge Ram Cummins Turbo Diesel(17mpg highway). I have not seen an increase in MPG since reaching 10,000 miles. I like my Eco and would buy it again. Adios.

 

This seems to be one of those threads where someone who disagrees will be dumped on big time. That said, I have a 2013 eco screw with 3.73 axle. Now I have about 22000 km on it and it runs well. City I get around 18-19 mpg on average if I'm easy on the rh pedal. Hwy I've managed to pull off off 22 to 24. I think not bad for a truck that weighs about 5800 lbs give or take. Around 18000 km I did notice that the feel of the truck changed somewhat. It seemed to become more responsive and didn't need as much effort to move along.
Mpg did improve a little on average.
Anyway, that's my experience.

 

I did not experience any bump in fuel milage and I am at 27,000 miles. I think some of those that got a milage bump were maybe trucks not getting the right milage to begin with and then they did.

 

My 2012 EcoBoost consistently gets 1.6 MPGs better than my 08 5.4. The EcoBoost is far better for towing than the 5.4. Going forward my choice would still be the EcoBoost. I never expected a loaded SCREW Lariat to get 22 MPG's at 80 MPH on the highway.

 

I traded mine at around 16,000 miles and never noticed any kind of fuel economy increase. And that certainly did NOT make me someone who bought a Max Tow truck expecting 21 MPG. Just someone who didn't notice any sort of increase as the engine broke in. Mine wasn't 6,200 lbs either, only about 5,860.

 

X2, about 3 mpg better than my 06 fx4 with 3.55 and 5.4, no comparison with performance either!

 

Is that 21 highway at 55mph or 65mph?I see where a lot of you are getting in the low 20's in fuel economy , I have never came close to that and I have 3.55 gears also.