scottinmt

I bought a new F150 with the 3.5 liter ecoboost about a month ago. My truck is the crew cab, 6.5 foot bed and has 4 wheel drive with the 3.55 rear end. First tank I received just under 16 miles per gallon, today I filled up and I received 13.5 miles per gallon. Most of the driving in the most recent tank was highway where I drove 70 mph on average. I'm thinking something is seriously wrong with my truck since the EPA estimates are 17 city and 21 highway with a combined of 19 miles per gallon. Any other ideas as to what could be going on?

Thanks

cgarison

I have a Max Tow/FX4 Platinum with 5.5 foot bed that gets fuel mileage in that same range in mountains of Pennsylvania, Maryland, West Virginia, and Kentucky. If I am running along I95 where it is a bit more flat, I get closer to 22 MPG at 70 MPH. As I put in another post, around the Philly burbs, I am getting 17 MPG. In eastern Kentucky, the local/town mileage is a little less.

All the above is based on 87 octane fuel. The mileage increases by 1.5 to 2 MPG if I run 93 octane, but at 50 to 60 cents additional per gallon, I am losing money out the tailpipe with little distance to show on the odometer.

srt20

I got 7.9mpg with my 18 Eco 3.5 on Tuesday. All boost and no eco I guess.........

















Of course I was towing a 30ft enclosed trailer too......haha

4leggedbucket

You know what they say right? It's either eco or boost but you can't have both lol all kidding aside it's all in your foot or ability to not spool up the twins, I vote smiles per gallon over miles per gallon any day of the week. Then again I have the 5.slow so I'm always heavy on the gas. Damn that addictive sound
Theres not much you can do for in town millage but slow it down alittle on the big road and your mpg will increase. Now if you idel a lot that could be the issue. Just my 2 canadian cents.. soo about .5 cents us lol

Richierich65

I am in the NW, and I currently show 12.5 mpg in a 2015 3.5, 3.55, 6spd, 6.5', 157", commuting empty.
Depending on quite a few factors such as elevation, air density, cold, and, idle time, as another poster mentioned,
can certainly adversely affect your mpg. With that said, in the summer, I get around 14.7 - 14.9mpg all things equal.

I do use the turbos regularly though......actually, probably less in the winter, due to traction issues.

idrive

iTrader: (3)

Need to remember, the EPA #'s are what the truck CAN get, not will get. Perfect conditions are required. Ambient temps, 93 octane, extremely slow acceleration and 50mph on a flat road with no wind unless a direct tail wind.

You also have the largest, heaviest truck of the configurations.

scottinmt

idrive, I thought they changed the EPA process to make it more consistent with regular travel, and didn't do such things as raising the octane above what the manufacturer suggested, driving at highway speeds (not 50 mph), etc? Although my pickup isn't the largest/heaviest of the available configurations, it is up there.

RL1990

Not shocking at all. It's well known that the EB engines are more boost than eco.

F150_Lariat_Luv

To add some reference... my wife's 18 RDX will get 28mpg on the highway with A/C on... and only 15 around town, she works 5 miles from home so we can determine best Highway mileage as well as worst City mileage. The OPs concern... is not a concern. A 3.5 screw on the highway will likely span 16-21 on any given long trip depending on ambient temp, winter/summer blend, part of the country that blend was delivered, your right foot habits, etc, and well yea ... etc. Way too many variables to say 'Shockingly Bad Gas Mileage" when you report you have only owned your truck one month. The 3.5 engine has such a sweet swell of torque and even if you don't rev it... if you tap the low end torque, you use lots of fuel. Before you get concerned, put some dedicated highway miles on it. My 5.0 will cross 22 when I travel state roads at 55-65. When I travel interstate at 70-80, my mileage drops to 17-18. Speed is the devil with any pickup.

scottinmt

To provide more detail or discuss the "variables". It was 45 degrees, I drove 320 miles at 70 mph with the cruise control engaged. The roads were not snow covered. I drove another 80 miles of mixed highway/city driving. I'm retired and drive like an old man, i.e. accelerate slowly and drive no more than 75 mph ever even though highway speeds here in MT are 80 mph (yes, I do stay in the right lane). This pickup is my first modern Ford, before this I always drove chevy trucks and always got at least 18 mpg regardless of conditions or "variables" using the 5.3 V8. I looked at the EPA estimates and honestly thought I'd be getting at least the same gas mileage as the GM 5.3 V8. Maybe that was a stupid assumption on my part, but I wanted to buy something that was made in the USA.