Ecoboost only---real world mileage.
10-05-2012, 10:27 AM
#2562
Senior Member
If the ECU finds it's having to consistently add fuel to the pre-programmed fuel curves to achieve setpoint (stoichiometric) more than about 20%, it will typically throw a "A/F ratio lean" code.
I think the "fuzzy logic" is limited to the tranmission tuning. I read up on it one time, and it really just sounded like it was altering line pressures to get the right clutch engagement firmness.
10-06-2012, 10:33 AM
#2565
I see posts describing city and highway percentages. What exactly is the definition of city and what is the definition of highway? Is there a consistent rule for each. Obviously interstate driving is highway, but is 35 mph on a stoplight free road through the blue ridge parkway considered highway.
10-06-2012, 11:32 PM
#2566
Junior Member
Join Date: Apr 2012
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Ok folks, I'll report in -
www
>general info - picked up truck 3/31, live at 6150' elevation, going anywhere means 250' to 500' change in elevation, no real city driving (only 6 stop lights in town 
),
>9450 total miles
>5435 hwy miles on long trips (450 to 600 miles in a day) at speed limit (75, 70, 65, 60, & road construction stops)
>3050 miles right in the heart of the Rocky Mountains (2500 to 3000 feet of elevation changes) -mostly at 65 MPH - included in the hwy miles
> 920 miles towing (5th wheel, 8500 lbs loaded)
> 630 miles in Yellowstone (8000' elevation & 45 MPH max)
>2465 miles in & around town but mostly hwy
Now for the MPG's),>9450 total miles
>5435 hwy miles on long trips (450 to 600 miles in a day) at speed limit (75, 70, 65, 60, & road construction stops)
>3050 miles right in the heart of the Rocky Mountains (2500 to 3000 feet of elevation changes) -mostly at 65 MPH - included in the hwy miles
> 920 miles towing (5th wheel, 8500 lbs loaded)
> 630 miles in Yellowstone (8000' elevation & 45 MPH max)
>2465 miles in & around town but mostly hwy
for total miles 17.1
for hwy miles 18.6
for heart of RM's 19.3
for towing 10.0
for in Yellowstone 20.1
for all miles not towing 18.5
All mileage is miles on odo divided by gallons purchased. Computer mileage seems to be about .2 to .4 mpg less than calculated.for hwy miles 18.6
for heart of RM's 19.3
for towing 10.0
for in Yellowstone 20.1
for all miles not towing 18.5
www
10-07-2012, 07:26 AM
#2567
I just stopped by a Ford dealer to test another Ecoboost to see if mine's a freak.
It was a 4x4 SuperCrew, 3.55. Obviously didn't hand-calculate as only drove for a short time, but the previous driver was getting 20.1 average mpg when I reset, and that must have been over a decent distance, since sitting there idling with the salesman didn't cause it to tick down at all.
On the highway, I think it was actually showing better mpg than my better-than-advertised mpg on my FX4 w/ max tow Supercab. I think I could actually get into the high-20s on the highway with the truck I just drove (dash-calculated).
It was a 4x4 SuperCrew, 3.55. Obviously didn't hand-calculate as only drove for a short time, but the previous driver was getting 20.1 average mpg when I reset, and that must have been over a decent distance, since sitting there idling with the salesman didn't cause it to tick down at all.
On the highway, I think it was actually showing better mpg than my better-than-advertised mpg on my FX4 w/ max tow Supercab. I think I could actually get into the high-20s on the highway with the truck I just drove (dash-calculated).
10-07-2012, 10:47 AM
#2568
I just stopped by a Ford dealer to test another Ecoboost to see if mine's a freak.
It was a 4x4 SuperCrew, 3.55. Obviously didn't hand-calculate as only drove for a short time, but the previous driver was getting 20.1 average mpg when I reset, and that must have been over a decent distance, since sitting there idling with the salesman didn't cause it to tick down at all.
On the highway, I think it was actually showing better mpg than my better-than-advertised mpg on my FX4 w/ max tow Supercab. I think I could actually get into the high-20s on the highway with the truck I just drove (dash-calculated).
It was a 4x4 SuperCrew, 3.55. Obviously didn't hand-calculate as only drove for a short time, but the previous driver was getting 20.1 average mpg when I reset, and that must have been over a decent distance, since sitting there idling with the salesman didn't cause it to tick down at all.
On the highway, I think it was actually showing better mpg than my better-than-advertised mpg on my FX4 w/ max tow Supercab. I think I could actually get into the high-20s on the highway with the truck I just drove (dash-calculated).
Here's my rational on my situation, had a 2010 xlt 5.4 L screw with 3.55, had 31k miles when I traded it on my 2012 ecoboost. MPG lifetime avg.....14.2. Now I've got the same truck essentially( ok, I got the 6.5 ft bed) crewcab, with 3.31 gears, ( maybe a little better than the 3.55 for mpg), hard tonneau, and I've got a motor with 1.9 l less size and 2 fewer cylinders. I NEVER drive highways because I don't have the occasion to and I never tow, ever( nothing against it, I just have nothing to tow). So I just have light suburban traffic and back country roads. My driving habits haven't changed, and I'm probably lighter on the gas due to the green mpg indicator( which may be more dangerous than texting while driving), I've never had it over 65 mph. So, I've gone 1100 miles and my avg is.....14.4..? I know my truck is new and people talk of a break in period, so I'm waiting patiently to see an increase in mpg. I just really don't see how it can't happen with my setup in my situation. It's not that I think anything is wrong with it, but it doesn't add up that it wouldn't be better than my 5.4 L
10-07-2012, 12:18 PM
#2569
Used. 28K miles.
I think location has a lot to do with it.
In the southwest, an Ecoboost will yield tremendous rewards to the conscientious driver.
Everywhere colder than that, and there is probably a law of diminishing returns on buying any truck that promises better fuel economy.
There is no truck that can warm itself up energy-free.
I think location has a lot to do with it.
In the southwest, an Ecoboost will yield tremendous rewards to the conscientious driver.
Everywhere colder than that, and there is probably a law of diminishing returns on buying any truck that promises better fuel economy.
There is no truck that can warm itself up energy-free.
10-07-2012, 02:14 PM
#2570
My truck currently has 1300 miles and I just returned from my first road trip. Vegas to san Diego and back. Averaged 13.8 mpg with no load. I have bigger tires than stock but there is no way at cruising speeds they are diminishing my mileage by that much. This was traveling 70-75 mph with 3.55 gears. Even my 06 titan got 18 mpg on the highway. Something def isn't right and I scheduled an appointment atthe dealer to have it checked out. Any ideas?