rmdailey

I bought a 2013 Screw 6.5 bed 3.5 ecoboost with the 3.31 gears in 2wd about a month ago. My MPG has been about 15.5 mpg tank average. Driving the same away I get 17mpg in my wife's 2008 5.4 expedition. It was a different route/trip but similar terrain and stops. WTF?

The truck had 82,000 when I bought it and now has 84,000. I do pull a trailer regularly but have been reseting to not factor that into the averages.

I changed the plugs because of a misfire. I also did the 1/16th weep hole in the intercooler because I thought that may have been the shudder, but the plugs were bad. My tire pressure is 30-32psi depending on the time of day. Carmax installed 4 new Nitto street tires (i'm sure the cheapest available). I'm running synthetic oil of the correct viscosity. And 87 octane unleaded from good gas stations. The only thing I've added is a cross box/tool box.

Could the weep hole be causing the turbo to run harder to keep the pressure up? It's easy enough to plug. I haven't noticed any lack of power.

Tool boxes catch wind but not that much.

I'll need gas tomorrow and plan on filling up with premium to see if there is a difference. I'l be driving the same route and have been trying hard to drive consistently.

My dad has been getting 19.5 in is 2014 Chevy Crew cab. But he's drives like an old man and has a bed cover.

jdunk54nl

You are right about the average

http://www.fuelly.com/car/ford/f-150

You could try cleaning the throttle body. I picked up 2 mpg doing so but from 12.5 to 14.5-15mpg. Granted I have heavy off road tires which make a bug difference.

Spiky

Put your tires to 38, see what happens.

SALEEN961

iTrader: (1)

You said you pull a trailer often, how much does your trailer weigh? If it weighs enough it may be worth switching to a higher octane fuel as many people have noted poor performance while towing using regular 87 octane.

I'll also second raising your tire pressures, without towing or hauling anything heavy I get the best, most even tire wear running 42psi in the front and 40psi in the rear. The door jamb sticker also recommends 35psi, not 30-32psi as you said you're running.

Jgshooter

Are the tires the same size as factory? A change in tire height will throw off your speedo and thus throwing off your vehicles MPG calculator.. Check your MPG the old fashion way and see what you get. I have a 2010 F150 5.4 my MPG shows to be 10, but after calculating it my self turned out to be 14.5.. All city driving..

Chad Walker

15.5 MPG for a full size truck is pretty darn good. I got 15 MPG when I had my Tacoma and FJ. I get 13.5 MPG with my EB. But I also don't drive like an old lady. The power is too addicting.

FX4BullDog

are you doing a lot of city driving? a mix of driving?

i do a mix of city, backroads, and highway, with a topper, and stock tires still and get high 16 to low 17 average. I also use the the cruise control religiously

Ricktwuhk

Disconnect both battery cables and touch them together, then reconnect. Transmission will "learn" your driving style and adjust to you. Truck will produce the MPG that it does, and then you can see what that is.

Tire reply is right on the money also.

Of course I assume you've done the standard tests of driving 55 mph on the highway, resetting the MPG for a measured drive on flat ground to see what you're really getting?

Missmy06

I average 16-17 in my 3.31 gear equipped Eco so your in the ballpark of me and I am a very conservative driver. I agree with the other responses to bump up your tire pressures.

WXman

For 8 years now, we've seen forum threads, news articles, etc. about EcoBoost owners not getting the MPGs they expected. It's common with these engines to drink fuel...especially when loaded or towing. There is nothing "eco" about them.

I test drove both and spent a little time with them on the same driving circuit so I could compare, and when the Coyote engine showed better MPGs than the EcoBoost that's what I ended up buying.