F350 lariat 350 drw s/c pulling 3 horse trailer from Tn. to S D and back mileage from 5mpg to 8mpg running 65mph or less. Friend following in a Chevy pulling same type trailer gas burner got as good sometimes a little better gas mileage I didn't think he would be able to keep up but was always on my rear and gas was always 20 cents a gallon cheaper. On the roller coaster hills when my truck would down shift it would shake and lose power for a few seconds. I miss my 2003 6.0 as I woud get 13 or 14 mpg it also had arm rest on the bucket seats and the front license plate holder is so filmsy I fear losing my license plate.No holders in rear doors. I would like to see a recall and another tank put on as every 250 miles I had to fuel up and you know how hard it is to find fuel you can get to with a trailer also every bump I would hit the cruise control would shuit off. Always been a Ford lover and a chevy hater. Thanks just the facts and this truck is on the market

 

I towed with mine for the first time yesterday and there is night and day difference between the 6.4 and 6.0. The 6.4 is far above the 6.0.......

 

how many miles does your truck have, once its broken inn a little more the MPGs will jump up quit a bit

 

5500 miles and my 6.0 never changed but it was good from the start. I talked to service dept. today and they said that was normal.

 

I have a new truck also... one thought I was always told when in tow mode you should not put on the cruse control... dont know if it was a wise tale or what... I getting ready to head to ND for a hunting trip... then over to ID..... My truck only has 600 miles on it...... will let you know on the miles.....

ART

 

my dad got his 6.4 today, we talked to a diesel mechanic and he said they are programmed super rich on fuel for the first 5000miles for breakin then it should jump? i guess we will find out

 

I heard this from other Diesel Mech. It is possible. My V10 didn't break in good until well over 3500 mi.

 

I was not in tow mode I talked to a guy from florida who had over 10000 miles on his truck and he said mileage hadn't changed lucky if he got 8mpg towing very unhappy

 

well sucks to be him and you, its clear you made up your mind...... it sucks that you didnt have things work out, you must have the 4.30 or 4.88 gears?

 

I have a 450 with the 4.88 and got 9mpg towing....

 

Oh boy, not good news. sorry it didnt work out for you. Im hoping for better results but am prepared for similar. Either way im sticking with it !! Im pretty excited !!

 

I have the 3.73 what is there to have worked out you can't test drive pulling a trailer no one is happy with the mileage or the shaking and loss of power when it down shifts

 

You may want to have it looked at. The mpg is way below what others with 3.73 are getting and there should not be shaking and loss of power when it down shifts. You don't have a whole lot of weight on it so the mpg should not be that low.

But then again it is on the market so who cares.

 

What is your setup? I see lower down in this thread that you have 3.73's, but how much does your truck weigh and how much does the trailer weigh, is yours a 4X4, etc.?

I have a 350 DRW long bed, but mine has 4.10's, 4X4 and is a crew cab. My truck weighs ~9,000 lbs when towing and my fiver weighs ~10,000 lbs. I get around 10 MPG towing with a combo of mountains and flat. I usually set the cruise at 62 and use the tow/haul mode.

 

4x4 I don't know the weight i keep my speed below 65 I am pulling a 3 horse trailer with 2 horses it is all alum. with a 10ft. living quarters same trailer I pulled with my o3 6.0 and averaged 14mpg with it same load dealer says he is getting same complaint from eveyone that has bought one but he has no answers. Everone in the campgrounds fom N.C. to S.D. semms to have the same problem