Hello folks!!! I have a 2011 F150 super crew 5.0 that I bought as a program vehicle with 9000 miles on it back in Janurary. At first, it got great mileage. It got nearly 20 MPG on the highway. Ever since, the fuel Mileage has been steadily dropping. Now, I am getting 17.5 on the highway. I have ruled out the gas due to the enthonal level still being 10 percent in my area and it didn't start when the summer blend switched over this spring. I transport gasoline for a living so, I know when any changes are made so, the gas is not the issue. I have heard of Eco-boost owners having trouble with cold temps but, the temps have risen here since Janurary. The air filter is clean and the tires are properly Inflated. I just changed the oil thinking that may do something, it didn't.

I am at a loss, anyone have any suggestions or, advice?

Thank you in advance.

Dave

 

BK 44k fuel system cleaner.

Give it a shot - it's good stuff. I've used it with great success on every vehicle I've owned in the last 6 years.

Only use it once a year, it's pretty strong stuff. Got my 1992 BMW 525i to go from 16mpg to 19mpg. Got my friend's 2006 Scion tC from 14.5 to 23mpg (biggest jump I've seen, but he didn't drive much - 14k in 4 years)

-John

 

The formulation of BG44K has been changed due to VOC regulations and is no longer as effective as it was. Techron does a better job these days and it's a fraction of the price.

 

You coudda' had a v6................EB

 

With ethanol gas, fuel system cleaners are nearly obsolete. The 10 percent ethanol is a better cleaner than any snake oil one can put in to try to supplement cleaning.

You should see after a gas station that has used conventional gas switches over to ethanol what comes out of the pumps if they didn't not have their systems professionally cleaned before the switch over. It amazing how well this stuff cleans.

 

There's more to it other than what ethanol does. The additive also does something when it's burning - it helps remove combustion deposits.

 

That is why ALL gas already has detergents in it. It was part of the clean air act of Janurary of 1995. Whether it is called Techron, invigorate, AP 205-20 which is the EPA's name for generaic additive, it's all does the same thing. Between the ethanol and the detergents that are allready in gas, I don't personally believe the hype about snake oil to put in the tank.

 

Have you always ran the same fuel grade I have noticed when I run 87 octane my 5.0 gets better gas mileage than when I run 93. Ive got my LCD screen on the mileage per gallon page like its a religion it's addictive. I know it sounds crazy but I do get better gas mileage with 87.

 

Are you sure you don't have an EB? Because that's what EB owners are all doomed to experience, at least if you read all the panic in the V6 boards.

Maybe its just a gradual change in driving habits or locations.

 

Well, from a root cause analysis, these are the changes that COULD decrease mileage:

1. Geometry of vehicle - lift/level kits, bug screens, bull bars, off road lights, etc...

2. Tire pressure

3. Tire alignment

4. Frictional losses in drivetrain (axles, TC, transmission)

5. Engine efficiency

6. Fuel energy level

7. Driving habits

8. Air temp / environment - unusual headwind patterns, humidity, etc...

9. Other energy drags on the drivetrain (brakes dragging, etc...)

10. Road rolling resistance

11. Fuel leak to atmosphere

Somewhere in the list is your answer. I'm not saying the other items in the list are contributing ANY effect, but they are the potential causes.

 

When you purchased it, it was probably "babied" by the dealer to show customers the gas mileage on the LCD screen. After you bought it, you probably drive it "real world," and the computer is showing you the true mileage your truck is supposed to get.

It's a V8 truck...be happy with 17!

 

yep same here

 

Your loss is weird, I have not experienced it at all. Came in last night, 125 miles through about 8 small towns, lots of hills, and i averaged 21.2 running 75 and 80 at times. Never under 70 except through the towns. One thing, there was little or no wind. A head wind really affects these trucks. I have 27,800 on it now. In mixed driving, I am averaging over 20 mpg for about 600 miles a week.

 

Bluejay,

Is yours a 4x or 2x?

 

It's a 4x2. I have never reset the Economy screen and it has averaged 19.5 for the 27,800 miles. I get about 17.5 around the city and anywhere from 19.5 to 22.9 on the highway, depending on weather, speed and hills. Just for grins, I checked it on a stretch of interstate, 85 miles with cruise at 68 and got 24.9.