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Old 09-25-2007, 11:22   #1 (permalink)
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Question 2008 Ford 350 Diesel 4X4 Super Duty

I recently purchased a new 2008 Super Duty truck. The mileage sucks I have approximately 3800 miles on it. They said not to even check the mileage until after 2000 miles. I tow a 5th wheel and towing I am getting about 8.9 mpg average. Anyone have a similar problem? We are already thinking about taking a loss and trading. We had a 350 Dodge Diesel (actually two of them) duallys previously and the mileage was about 12-14 towing. Any ideas short of getting rid of this already and taking a loss?
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Old 09-25-2007, 15:39   #2 (permalink)
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Re: 2008 Ford 350 Diesel 4X4 Super Duty

I'm puzzled..... I have a 2006 F250 with the 6.0, and towing a 33' Travel trailer (not as tall as a 5th wheel, but still a lot of air resistance) I get 14 - 15 as long as I keep it between 65 and 70. If i get over 70, the mileage drops like a rock.
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Old 09-26-2007, 13:49   #3 (permalink)
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Re: 2008 Ford 350 Diesel 4X4 Super Duty

I have a 2000, 7.3 when towing above 70mph he's right the milage drop drasticly. When I stay above that mpg are alot better 12-13mpg. You may want to give the new truck alittle more break in miles.
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Old 09-27-2007, 18:32   #4 (permalink)
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Bad Mileage

Thanks for your thoughts on my lousy mileage...On the way home from our trip we got all the way up to 10.3...so, I will give it some more time and see what happens. DieselPower Mag had a whole article and said they got about 19 mpg...which of course, is most likely unreal, but towing, I would be happy with at least 12-13...We shall see.

Thanks again.

Al
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Old 09-01-2008, 08:58   #5 (permalink)
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Re: 2008 Ford 350 Diesel 4X4 Super Duty

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Originally Posted by Al05 View Post
I recently purchased a new 2008 Super Duty truck. The mileage sucks I have approximately 3800 miles on it. They said not to even check the mileage until after 2000 miles. I tow a 5th wheel and towing I am getting about 8.9 mpg average. Anyone have a similar problem? We are already thinking about taking a loss and trading. We had a 350 Dodge Diesel (actually two of them) duallys previously and the mileage was about 12-14 towing. Any ideas short of getting rid of this already and taking a loss?

I hear/feel your pain. The mileage does suck. My buddy has a 2007 super duty 350 dually and he gets better mileage then me towing his 5th wheel. I am surmising that we have to give the truck more time, however, I may give in to the voices and sell my fith wheel, trade the 1 ton in on something else and get a pool. I think the mileage may improve considerably after that.
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Old 09-25-2008, 19:46   #6 (permalink)
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Re: 2008 Ford 350 Diesel 4X4 Super Duty

I have the same problem with mileage. I have a 2008 F250 diesel and I bought a cool air intake and a diablo predator tuner to help with mileage. I am averaging 11.4 mpg and that is just driving without towing. I really stinks and I am wondering if there is something wrong with the truck because everyone I talkt to seems to think that is low for a diesel. I have over 16,000 miles on mine.
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Old 09-29-2008, 10:06   #7 (permalink)
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Re: 2008 Ford 350 Diesel 4X4 Super Duty

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Originally Posted by Al05 View Post
I recently purchased a new 2008 Super Duty truck. The mileage sucks I have approximately 3800 miles on it. They said not to even check the mileage until after 2000 miles. I tow a 5th wheel and towing I am getting about 8.9 mpg average. Anyone have a similar problem? We are already thinking about taking a loss and trading. We had a 350 Dodge Diesel (actually two of them) duallys previously and the mileage was about 12-14 towing. Any ideas short of getting rid of this already and taking a loss?
Let that baby breathe! What I mean by that is....get an exhaust system which will allow that big boy to breathe. That tip also should include a K&N filter. These new trucks stock intakes and exhausts restrict performance a lot.

The above plus a little bit more on the road miles will help loosen her up.
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