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Discussion Starter #1
I have a 7x16 trailer dual axle. I was pulling it with an F150 but it was just to much for it. So, I upgraded my truck. I got a used 2008 F250 Lariat with the 6.4.

Without the trailer I was getting about 17 to 19 on the highway and about 10 to 14 in the city. For the first time today I decided to take the truck and trailer out to see how it would do on about 4 miles on the freeway. What a joke!!!

I reached 70 and put it on cruise. Reset the avg mpg. It read about 9mpg by the time I exited. When I came back the same way I reset the mpg and the same thing. I don't even have the trailer loaded yet. The boost is around 1/4 to half and it is windy. Not sure how much wind plays into it.

Is this normal?

Thanks, Jason
 

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Sounds about right for a stock truck based on what I have seen other folks post. I have been tuned and deleted since 5k mi so I do not have any real world knowledge.
 

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Sounds about right for a stock truck based on what I have seen other folks post. I have been tuned and deleted since 5k mi so I do not have any real world knowledge.
Does tuning significantly help? I would rather tune than have to do physical mods.
 

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It will. I never towed any significant weight after my tune with my stock wheels and tires so I wouldn't be the guy to say what you can expect.
 

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That wind played a significant role in your MPGs because of the enclosed trailer. If you tune and delete you will see an improvement.
 

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Wind is a huge factor. If you were pulling 10-15 lbs of boost the whole time that is going to eat fuel. Keep boost and RPM's in check and you will see much better MPG's. Tune it and it will get even better.
 

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Discussion Starter #7
Thanks for the info. I have seen so many tuners. They are not cheap that is for sure. Is the dpf the thing on the exhaust?
 

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Also keep in mind, you're basing your results off the Lie-o-meter. Even though those numbers don't seem to be too far off.
But like others have said, wind is a HUGE factor.
 

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Yes, I'm tuned and deleted. With that being said, I know other guys that do better, but I pull a 13k 35 ft goose neck and am lifted 6" with 37" mud terrains and still get10 MPG hand calculated. You can't trust the lie-o-meter too much. You're probably getting worse. Mines is usually 3-4 MPG high from what I'm actually getting.

So, yes, to get much better mileage and performance you should be tuned and deleted. And agreeing with the above post, strong winds can make a huge difference when your essentially driving a big sail.

Check out the performance section. There are a lot of good reads. And welcome to the forum.
 

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I just towed my 32' 7500lb trailer about 750 miles and averaged 10 MPG. I was hoping for more, but it towed great. I'm thinking it's more wind resistance then weight when it comes to these trucks towing.
 

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As stated, the wind had a big factor. I can't tell for sure, but your trailer looks flat on the front. That also contributes. It's like pulling a brick down the road. Trailers aren't known for being aerodynamic.
 

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a v nose front trailer makes a huge difference in the wind. My 29x8 enclosed v nose sled trailer pulls better than my 7.5x14 flat front work trailers all because of the v nose.
 

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Discussion Starter #13
Man you guys are great with the info. The trailer does have a slight V to it. I can only imagine what it would be like just flat!
 

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4 miles isnt enough distance to get an accurate average MPG reading.

Delete the DPF and tune the thing. You'll be much happier
 

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Yeah I know it kinda isn't but that was as far as i needed to go and I reset when I was already doing 70 so just went by that. I am sure it might get to 10 or 11 but still.
 

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Discussion Starter #16
Took the truck out last night without the trailer and I got 17 to 19 on the highway at about 60. Thats insane that my trailer brings it down that much. Would one of those scoops on the top of the truck help keep the wind off the trailer?
 

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had a little run this summer 4000 miles with a 8.5 x 24 square trailer. On the cruise from East Coast to MT 70mph all the way and back average was 10.1

One tank was as low as 8.8 due to slight head wind (25mph)
 

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My truck dropped 1-2 MPG pulling an 18' flatbed with about 10,000 lbs of logs on it on the highway. The total height of the trailer with logs was still well below the height of my tailgate.

I am convinced you're facing an issue of fighting a losing battle against the wind. Aerodynamics play a huge role once you get one of these things over 60 MPH.
 

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My lie o meter went from 19 down to 13 towing an empty 18X8 enclosed V nose. The truck barely knew the trailer was back there but the fuel gauge sure did. I know I was getting better then 13mpg but not much better. I'm guessing ill get around 9-11 with 6K+ in it.
 
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