With the 3.55 gearing on a 3.5L EB, my 25mi commute that's about 25% 75mph, 40% 60mph, and 35% 30mph...I get an average of 14.1mpg. If you hear the turbos spin up, you're using gas

 

Not sure where ya live,i had a 13 egoboost and in the mountainous terrain we live in you can't go anywhere without getting into the turbos. Even a slight uphill grade its into the turbos and most of these roads are at the max a 60 mph road. I have come to the conclusion that , that was one of the biggest problems with the truck and the **** pooor mileage. My 06 5.4 4x4 with 3.73 gears averages around 16.5. Before ordering our 15 5.0 I talked to local owners of any 5.0 I could talk to and all were doing much better then the locals I talked to with egoboosts. All the egos were at best doing 16 and that truck was with 3:31 gears. Then the dealer let us take one for a long drive(about 60 miles) out of town and into the normal areas we would drive and the one we drove averaged 19.5 the ego was at 13.5 to 14. That was babying the ego and driving the 5.0 normal.I do feel the egoboost is a good motor and can get good mileage if its used as a flatland truck and never tow. When we towed with ours we would get 3-4 with the camper 6-7 with the flatbed. It was into the turbos from the time we started it to shutting it off.

 

Did you have a boost gauge on your truck to verify when you were really getting into boost? The factory tuning in the EB normally keeps the truck right around 0 instead of letting the engine run a vacuum at low throttle settings like most turbo engines do. I suspect Ford did this to make it behave like a N/A engine and have instant throttle response. It then uses a small amount of boost to deal with hills and such. With the cruise set to 75 it might hit 5 PSI on something steep. I can't see the throttle angle setting but I suspect it uses boost pressure instead of throttle to add small amounts of power.

From the sounds of it your truck might have had a faulty boost control solenoid it some other fault in the pressure control circuit. That would cause the issues you describe and the poor fuel mileage.

 

If it's not in boost, it's a 3.5 L v6, which you guys say can outperform a 5 liter v8 now?

Can the non-turbo 3.5 now beat a 5.0?

I think these things are in turbo a lot more than you think... I dont see how it can be towing anything and not be

 

I know exactly when it is using boost and when it isn't, there's a gauge on my dash connected straight to the intake manifold. Without the turbos it would be very similar to the base 3.7 which is fairly capable in its own right. In fact the 5* economy tune basically turns the turbos off at anything under 1/2 throttle.

 

Nope no boost gauge: at one point at the dealer we took it for a drive ,the tech-mechanic-comp. guru,or whatever the person is called that repairs these new vehicles had a comp. hooked up to the truck , he was watching everthing that goes on as we drove, he commented several times as driving when I was into the boost and when not. only time it was not into boost seemed to be when I was slowing for a stop-coasting-going downhill or just cruising on a flat road and doing under 50 mph. 65 to 70+ it lived under boost, I don't know what percentage at what point the boost was. Just that the computer guru stated all was within acceptable parameter's. Who drives a freeway with a speed limit of 70-75 and some of ours are 80 at 55 to 65. To me this is not a fuel friendly vehicle at real world use.This test drive explained to me ,also why when towing anything I was seeing with toy hauler 3-4 mpg with the flatbed depending on load up to 8-9.I understand window sticker mileage is not real world and done in a perfect condition and at 50 mph and some say at sea level. we are and drive from 5000 ft to 10000 ft. My comments are from my use and my experience.and also know that your experience's and use will very a great deal . I am sure altitude has a great deal to do with any vehicle boosted or not. I can tow same trailers with our 06 5.4 4x4 and do much better mileage,it doesn't pull as well as the egoboost but does tow. From these experiences is why the egoboost is gone plus other assorted problems,and have ordered a 15 5.0. That decision was also why I posted a few threads asking various question such as the start of this thread and others to come to a senseable conclusion as to ordering a 15 5.0 or going to another brand.

 

Your credibility would be improved if you didn't refer to it as egoboost.

 

I'm just happy that you decided to give Ford another shot. And I am not an enemy of the Ecoboost. I do think another 5 years or so will diminish trouble areas with it. The more years with real world feedback, the better it should be.

 

Sorry that egoboost hurts your feelings, I know that this motor seems to be a love hate relationship. As we know the ecoboost is fords billion dollar baby, and as we know ford has a very big ego because of it. They are not going to let it fail and shouldn't. But I refer to it as an egoboost because it is. And a name is a name, kind of like screw or scab. I am not attempting to prove my credibility to anyone. I am just stating my experience, I kind of thought that's what forums are for. Some folks hate ford love dodge some hate chevy love ford I even found a guy that loves chevys. I've had them all and keep going back to ford

 

Doesn't hurt my feelings, just makes you look like an immature 3rd grader that has resorted to name calling. That's all. Proceed if you must, just wanted to let you know how your posts are perceived.

 

I just recently did a big road trip back home with my ecoboost, when I left it only had ~3700km (2300miles) and came back with ~9300km(5800miles). I was pretty happy with the mileage considering it's not really broken in.

2014 Supercrew eco and 3:55 gears with the large 135L (35gal) tank.

It was an empty box with about 200lbs of gear in the cab
First stint was from Vancouver, BC to just north of Calgary, AB. Through the rockies (highest elevation is around 5500ft). At least 60% of the run was at 130km/hr (80mph) and rarely was below 110km/hr (~65mph) average over 1100kms was 12.6 L\100kms (18.7mpg US).

Second stint was across the prairies from North of Calgary to Central Manitoba I added my Uncle and another 200lbs worth of gear (some in the box).
Elevation drop from ~3000ft to ~400-500ft. we covered 1400kms (870 miles)
Average speed was pretty much 110km/hr (~65 mph) the entire way. the mileage stayed very level and the average for the day was 11.1L/100km (21.2mpg US). Very little stop/start and no wind (head or tail).

There were a few smaller trips throughout the week empty and mostly highway (some showing off...). It averaged 11.9L/100km (19.8 MPG US)

On the way back there was more of a load. I put my Snowmobile in the box (approx. 550lbs) and a lift, etc.

For the first leg of the return trip (back to north of Calgary), we had very, very strong headwinds. Trees bending over and gusting sort of winds. I set the cruise at 115km/hr (72mph) and over the day the average was 14.5L/100km (16.2mpg US). I was very impressed with this, I know even my 2010 5.4 (similar config as my new truck) would be around 12mpg's in similar conditions.

Still fought winds on the last leg of the trip back to Vancouver going through the mountains and held the higher speeds. Only difference is that a larger percentage of the driving was at slower speeds thanks to heavier traffic and construction. Average was still close to the previous day at 14.6L/100km (16.1mpg US)

At the high speeds and pushing a big wind with the load AND going up steep grades, the truck never downshifted below 5th.

I really didn't buy my truck because it had the eco, it just happened to be on the lot at a good price and had the rest of what I was looking for. I would have gone for it, if it had a 5.0 just the same. They both are awesome motors, but I'm having a great experience with the eco so far.

my daily commute is very, very heavy city traffic and my average is 16.5L/100km (14.3mpg US) and I'll have to check for an updated lifetime, but it is around 14L/100km (16.8mpg US).

I'm wondering if the 3:31 gears is actually hurting the mpg's at altitude and with the climbs The 2015's with the reduced weight have to be better though.

 

to the ecoboost gods

 

Just relaying on my experiences, I have no love of the eco just yet, but happy with it so far.

Since there is such a wide range of actual mpg's with different owners, there must be something that the eco motor is sensitive to. If the 5.0 is more consistent, which I think it is amongst different owners, then that is definitely one reason to go 5.0.

I did notice mine seems to be happier with 89 or 91 octane, I'm not sure if it's the higher octane and allowing more timing, or just that the higher octanes have less or no Ethanol

 

Ford does recommend premium fuel for the EB when towing or carrying heavy loads, especially in hot weather.

 

Totally agree; out west shell or chevron seems to be the best fuels, ran 89-91 all the time , it did help but not much. opinions are formed from experience, experience is formed from use and that use formed my opinion of the ecoboost.