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Poor Fuel Economy

43K views 28 replies 17 participants last post by  Sherman  
#1 ·
Just got a 2013 F150 Lariat SCrew 3.5 Ecoboost, 6.5ft bed, 3.31 rear end, had it a couple weeks now and noticing some real poor fuel economy. Avg on hwy has been 14.2. Looking for ideas to get that corrected. I'll be towing a 23ft camper along with an ATV in the bed and don't really want to be pushing 8 mpg's through the summer. :mad:

So far all I've done is changed out the air filter to K&N.

Thought about changing spark plugs out. If I do, should I stay with OEM?

Also thought about a Diablo Sport Trinity T1000 programmer/tuner.

Any thoughts?
 
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#2 ·
Is the air filter oiled? Take it out asap then.
Sp534 plugs work great. Make sure they are gapped to @ least 0.030

SCT tuners are what most major players are using.


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#18 ·
I checked and yes it was an oiled air filter. I've heard the K&N filters were nothing but the best. What is it with the oiled filter that I shouldn't be using them in my ford?

I'll look into the SCT tuners. My problem is I don't know a darn thing about tuning/tuners etc. I live in Montana and there isn't many performance shops out here.

The OEM plugs seem to be the consensus from everyone. Many thanks, 2Canches!
 
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#3 ·
Yes change plugs and stay with oem motocraft SP534 gaped at .030. As far as tuners choose any of the ones mentioned here on this forum, the X4 being the most popular one from any of the venders on this site

Edit: ^^^^ with filter ^^^^^
 
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#4 ·
Change your plugs. Gap them .030 with no tune. .028 with tune.
Just replace with Motorcraft SP534's.
I would not use a oil coated filter system. Dry filters are the best IMO.
You should really look hard at the SCT tuner.
That's what most members on this forum run.


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#6 ·
My 13 gets 20 mpg's on the hwy and on my daily commute to work in rush hour traffic both ways it gets 16.. I've even got 3.73 gears and OEM 20's.

How you drive an Eco can make a difference too. Get into that boost and there is no more "ECO"... ;)

I tow a #5000 TT and get 10 mpg's with it for the most part.

I changed my plugs with about 28k miles with the MC ones mentioned above. Everything is bone stock on this thing.

I'd try disconnecting the battery to reset the computer... I did that after my Sync stopped working on USB. It brought back the USB and the truck seems to be running "better" now too... I didn't do the reset after the plug change, but now that I did, it just seems to be back to the way it was when it had 100 miles on it.

I gotta keep the speed under 70 mph to get the 20 mpgs...

Good luck!

Mitch
 
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#19 ·
I'd love to see 20's....Thanks for the info on the battery Mitchf150, much appreciated.
 
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#7 · (Edited)
What others said above. I would add that maybe it's a good time to clean all 3 temp/map sensors. 1 right after the filter (if it's dry, don't worry about the oiled filter talk mentioned above), 2nd sensor is just b4 the throttle body on intake pipe, and 3rd is on top of the intake manifold under the engine cover. Very easy to take out and clean with MAF cleaner.
The 3:31 gears like towing that kind of weight at 65-70mph hwy in 5th gear. Lock out 6th gear. It will pull it in 6th, however it will be running high boost, and burning more gas. I get between 11-12mpg pulling 5500lbs TT.

Good luck.
 
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#20 ·
Thanks for the tip noodles, on the sensors AND using 5th gear for tow...that will be a game changer this summer!!!
 
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#8 ·
Not sure what your current mileage is on your truck, but if it is over 20,000 miles then I would suggest the following:
1. Replace your spark plugs with Motorcraft SP-534 and make sure they are gapped to .030 (if you add a programmer then gap at .028)
2. Clean the three intake sensors
3. Do a KAM reset
4. When daily driving (not towing), pamper the throttle and try to keep your RPM's below 2000....it's hard because this is such a fun engine to romp on, but this will keep you from being in boost too much.
5. Use the best available top-tier fuel that you have.
6. When the douche-nozzle in the Chevy/Dodge tries to race you, DO NOT TAKE THE BAIT!

Following these 6 steps should ensure that you see a significant increase in your mpg's. I believe that between 16.5-18 should be possible around town and 19-21 on the highway.
Good luck to you and also keep in mind that most gas stations are, or soon will be, changing over from their crappy winter blended fuel and the better performance warm season fuel will help you achieve higher mileage as well. -Clark
 
#9 ·
One last place that I found for poor mileage is the parking brake on our trucks. I noticed that one rear tire was much harder to turn than the other. The parking brake on that side was partially engaged, more specifically the lever was rusted in place. I was able to tap it back in the released position and got 2 mpg back one winter gas. The parking brake does not have a spring return (at least not on the outside) and they seem to hang up. My truck is a rust-belt truck where the road salt causes havoc on the bare metal parts. Your results may vary.
 
#16 ·
Haven't romped on her just yet but the tire pressure it is good idea, haven't checked that yet. Thanks Slothman!
 
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#17 ·
The 14.2 was highway miles a couple days ago, I'm now easing into the 16 range. Not sure why
 
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#15 ·
Coming home tonight cruise control set at 69 I was getting just about 17 mpg. I'm 30 minute commute, flat terrain.
 
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#29 ·
i live in alberta, which should be similar altitude to you. i get okay mileage around here (highway is usually 13s at best) but going to my parents place in BC, i get 21 mpg on the way there and back as soon as i get to the other side of the mountains. try the stuff the others have said. 13 king ranch with 3.31s here.
 
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