rbs

My 2011 FX4 SCREW 3.73, 10,000 miles has never come close to 20 mpg highway. The best that I have gotten is high 17's on extended trips, 70mph mostly on cruise control. After reading about similar EcoBoost owners getting over 20 mpg, I was curious if there is something the service dept. could check/adjust to up mileage. Although my in town driving can deliver 15-16 mpg, I would like to get the "advertised" fuel economy. Love the truck, just want better mpg.
Thanks

jcain

With 3.73 you need to be doin 60-65 to get 20+. Stout gears help with towing but kill mpg on the big end

maplelakeduckslayer

Yeah, my FX4 hates speeds over 70 mph. At 70 mph I'd probably be lucky to get 18 mpg. Keeping it slightly above 60 mph I have gotten over 22 mpg on extended trips. Keep the speedo below 65 mph to have a chance at 20 mpg, nothing is broken haha.

Jbrowning22

I have a 2011 XLT SCREW 3.73. More than likely it's your driving style preventing you from getting 20+ mpg.

Commuting daily on back roads, I get 18.6mpg, but if I start mixing in a few days of highway driving I will hover around 19.9/20.1. On road trips I can easily maintain 22/22.6mpg.

My wife drove the truck for the first 20,000 miles, and averaged between 15.8/16.1mpg. I assumed that it was just because she drove in rush hour. But, on a 700 mile road trip where I reset the mpg display before hand, I witnessed her STILL only get 16.5mpg on the highway.

If I had to describe why she gets crap mpg, I would say that it has to do with not knowing when to "coast", not being able to predict the behavior of slow moving traffic (ie: knowing when to creep forward at idle, and knowing when to push on the gas), and knowing how far to depress the throttle when accelerating on the highway, without causing the transmission to downshift. I know it all seems petty and stupid, but it's the little things that account for the extra 2-3 mpg.

Chunter3775

Well I have a a 2011 crew 3.73 and I didn't pay extra 4k for a motor to.sit there and play Mr scientist with it. This weekend was my first road trip with it in and it got bout 19 to 21 avg MPG but while I was in the mountains staying about 40 55 I was averaging 21 22 . It just hit 8300 miles on the truck I love the truck and.power I get out of it. I traded in a loaded 10 titan that on best day get 15.2 MPG and 350 to a 28 gallon tank. So now with a 26 gallon tank I'm getting 100 miles more I'm def not complaining.

billf

At 70mph my 2012 scab 3.73 4x4 ecoboost is only turning over at 2,000rpm. One would think that at that low an engine speed I'd get great gas mileage, but so far the best I've gotten with a fairly frugal driving style is about 17.9mpg.

Does anyone know if the California emissions package reduces gas mileage?

maplelakeduckslayer

Read above, 70 mph is good for around 18 mpg, keep below 65 for a chance at 20.

TheWhiteBeast

Same goes for the 5.0 with 3.73's. If I drive 65 I get 21, if I drive 70, I get 18. If you've been a Ford truck owner for any length of time you would be amazed by your numbers. Think about it this way, you drop 5 mph from your normal every day driving and get 3-4 more mpg. If you drove 70 for 4 hours you would have gone 280 miles. If you drove 65 for 4 hours, you would have gone 260 miles. What's 20 miles between friends?

11screw50

I've found that with the 5.0 I can do much better if I dont use cruise control. I suspect that cruise control doesnt allow the same fuel savings when coasting.

No idea if it works the same for the EB (or anyone else for that matter), just an observation and suggestion of something you could try.

billf

Thanks for the tips. I'll do some experimenting with 65 vs 70.