Well, I took it mine into the dealer yesterday and had them look at it. They found nothing out of specification. They claimed to have called the Ford hotline and did a battery of additional test and found no parameters out of spec.

The service manager said to run several (6) more tanks of fuel through it and record the mileage and he would then use those numbers to attempt to escalate the problem.

I plan a long Labor Day weekend trip with it and I will see what I get.

 

Wow, suprised to see this thread alive still, Update on my truck: Currently have about 8500miles on it now and my mpg have jumped up to around 17.8mpg. If i reset my mpg on the information center when on the highway after about 30solid minutes it will stay around 20 to 21mpg. I mainly do city driving though so 17.8 would be a 50/50 mix of city and highway driving at about 65mph highway and 35mph city with a crap ton of stop lights. Running on 87 octane fuel.

 

It sounds like your problem is sitting a the red lights. I'm glad your mileage improved so much.

When I take the kids to school, 20 miles away, my mileage jumps to around 21. Just about the whole ride is rural roads except the last two or three miles. It'll stay up there until I start going to work. That is only 5 miles away with three of them being rural roads and the last two stop and go traffic. What makes it worse is if I have a long separation between taking the kids to school and I go to work. About a mile or two of the commute to work the truck is still warming up. The work commute will drop my mileage to around 19-20. Still not bad and definitely much better than my last truck.

 

I just bought a 2012 Lariat 4X4 3.8 EB with 14328 mileage. After the first 500 miles 50/50 city/highway, I am very disappointed in the mpg. Getting 14/16 and that is when I drive like an old lady which I have to force myself to do in this truck. Everything else I'm in love with but the mpg. I'm wandering what can be done with the dealer to get this fixed. I called about it and they said I'm driving it too hard...which is totally opposite of what I'm actually doing. You guys who are getting 18/22+ are making me sick to my stomach but awesome for you! I can only dream of those numbers right now!

 

A couple things you might consider before you get too upset: A 4X4 is rated at an average of 15 mpg in city driving (range of 12-18). You are getting 14 not bad. When the EPA says highway, they mean rural highway not freeway. They also only test up to 50 mph not the typical freeway speeds of 70-80. You are getting 1 mpg less than the rated range of 17-25 for the 4X4 on the highway. If you are driving on the freeway not a highway that could more than account for the 1 mpg difference. You have purchased a used truck. The person before you might have been heavy on the throttle, so the computer learned to drive like it is a hotrod. Many people also change the truck in ways that make it nicer to them, but can cut into fuel economy. Things like larger tires, lifts, wheel well liners, mud flaps, grill guards, all can look cool but lower your economy.

 

You could disconnect the battery for 20 minutes or so to clear the adaptive learning.

 

Great point! Thanks!

 

Will do and will let you know how it works! Thanks!

 

Back again with an update. This post got longer than I thought it would, but here's some more detailed info on my truck.

2012 Fx4 Screw sunroof/leather and 20" wheels. I just ticked over the 10,000 mile mark this weekend.

All this was run on 87 octane, and I haven't seen any difference between winter and summer blends. For the most part, I am a very patient driver and am very conscious about my speed and how heavily I get on the throttle to pass people.

Lifetime: 16.8 mpg
Pittsburgh city driving: 10-13 mpg
Albuquerque, NM city driving: 15-16.5mpg
Interstate driving (75-80mph): 18mpg

150 mile run between Pittsburgh and State College I usually average anywhere from 19mpg to 21mpg depending on wind, and more importantly speed. This drive has hills going up and down constantly, 15 stoplights that I almost always hit (have to accelerate back up to 60ish after every light), and varies in speed from 45mph to 65mph. I often drive in the 70-73 mph range for half of it, and 58-63 mph in the other half. I always try to beat my previous mpg records for each one way trip. However, when I'm occasionally impatient my mpg's go down significantly on the trip typically around 17mpg.

I've driven from Pittsburgh to Albuquerque twice now as well. All I can say is that your speed is vital to getting those higher numbers. Avoid trying to pass a ton of people with your throttle mashed, that always affected my MPG pretty significantly. Throughout both of these trips, I was only able to reach 20mpg's for the day of driving between Pittsburgh and St. Louis (the speed limit's are lower here overall). The next two legs of the trip were about 18mpg at 75-80mph.

Above all else, hopefully you are lucky enough to live somewhere flat that has well timed street lights!

 

I think it has to do with the break in period, most cars will gain 5-15% mileage after the first 10k miles. Just depends on the make of the vehicle.

Personally my current truck(2012 Tundra Crewmax 5.7), didn't see mileage increase until around 3k miles. Driving unloaded my best mileage is around 65mph, loaded anything past about 62 mph decreases mileage rapidly.

 

Just finished a 260 mile trip. Set the cruise to 68, relatively flat with 500 miles on the truck and she was at 19.4mpg and climbing. Trip consisted of mostly highway with some stops and slowdowns going through towns along the route.

So far I'm very pleased with the mileage.

 

I'm a little disappointed in the MPG too. I probably was expecting too much though.

I think when already moving the Ecoboost engine is much more efficient at maintaining speeds.

However, when accelerating it takes almost as much gas to get the truck up to speed, so if you're doing a lot of stop & go don't expect to get much better gas mileage than your old truck. (in my case a 2009 5.4L Lariat) Then again, the "aggressiveness" of my driving is probably higher b/c I am accelerating faster b/c the truck accelerates much easier/faster.


Also, I've been using Remote start to cool the car before I get in, which also eats in to the MPG rating as the truck is just sitting there for a minute or 2 before I get in.

When I put the improvement in to % it is actually ok.

2009 5.4L: average 12 mpg (city)
2012 3.5L: average 14.5+ mpg (city) = 20% better MPG

I also just changed to a completely new driving route a few weeks ago right as I bought the truck (gotta bring kid to pre-K) which I believe is harder on (decreases) MPG rating.

I think my comparison is very good (apples to apples on everything except engine) b/c my 2009 was virtually identical to the 2012 (options, transmission, axle ratio, etc.)

 

I just bought a 2011 F150 Lariat with the EcoBoost........truck has 22,000 miles on it. It also has 20" wheels with 305/20's with a leveling kit.

I've put about 1200 miles on it. I get about 17 HWY miles and just driving around town, and the 20 mile drive to work I get about 14.5-15.

Not what I was expecting from the ecoboost, but with the oversized tires I can understand. I'm running regular gas in it for now, with 1 tank of premium so far. I noticed a small increase in mileage but not much. Did that basically to clean the system.

Has anyone been putting programmers or chips on their eco's to bump up the mileage? and has it helped?

 

Did you try disconnecting the battery for a few minutes? The previous owner might have been "lead foot Louie" and your truck learned to drive less than optimum for economy. Also if your truck was purchased from a dealer it is not uncommon for people to take them for test drives and floor it. Add that to Louie and it could take a bit for you to see good economy. Both can make your economy be lower than your driving style allows. The truck will eventually learn to drive at the optimum settings for you, but it will take a bit.

 

I bought a 2012 157"WB EB SCrew with max tow with 3.73 axle the end of May. It just got totaled on the 23rd of Sept. when someone pulled out in front of me on the highway. It had right around 8600 miles on it. I had never reset the trips, and the overall avg. was 15 mpg. I had gotten as his as 23mpg on a 50 mph trip. I traded a '95 F150 with 3.55 and a 5.8L engine which averge about 10 highway and 7.5 towing and a '97 Explorer which was avg. around 15. Overall I am really happy and since the crash the girlfriend wants to get rid of her RAV4 for a truck with the 3.31 rear. Waiting on my new truck another EB.