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LONE-STAR
07-29-2008, 09:09 PM
I have a question for you guys with diesels puling your trailers. I have a 2005 f-350 4x4 with the 6.0 diesel. I am pulling a 8000 pound TT toy hauler empty(11,500 loaded and I have not pulled it loaded yet) My truck will not pull my trailer in overdrive which is making me get 5 mpg:eek: . So what I was wanting to know is how is every body else doing. What truck are you pulling with, how much weight are you pulling, and will it hold overdrive. Oh yeah whats your mpg while towing ??? Thanks in advance.:thumbsup2

tinah159
07-29-2008, 09:19 PM
Hey this is Darrell...

I have a 2003 Ford F350 6.0 Deisel 4x4 that I tow a 32 foot Wildcat 5th Wheel. The Nightcrawler (5th Wheel) is 8900 lbs dry and around 12,000 lbs loaded. I do not tow in overdrive, I use the tow/haul mode and I get 12 to 14 mpg on the highway on flat land and usually get 9 to 10 mpg in the mountains of NC & TN. I have done nothing to the computer to obtain better milage because my research shows that is not good for the engine. You should be getting better fuel milage than what you are getting if you are on flat land.

LONE-STAR
07-29-2008, 09:26 PM
Hey this is Darrell...

I have a 2003 Ford F350 6.0 Deisel 4x4 that I tow a 32 foot Wildcat 5th Wheel. I do not tow in overdrive, I use the tow/haul mode and I get 12 to 14 mpg on the highway on flat land and usually get 9 to 10 mpg in the mountains of NC & TN. I have done nothing to the computer to obtain better milage because my research shows that is not good for the engine. You should be getting better fuel milage than what you are getting if you are on flat land.

I also use the tow haul mode, but it is still suppose to use all the gears in tow haul just change the shift points and down shifting but mine just wont do it:confused3. I cant get into the final gear thanks for the reply.

stacktester
07-29-2008, 09:55 PM
My truck is a 2004 Chevy crew cab 2wd with a Duramax/Allison. My trailer is a 2008 Cougar toy hauler that weighs about 8k empty. Loaded is probably 10k. I use the tow/haul mode as well and don't seem to have a problem. I get around 10 pulling at 70 mph. If I back off to 55 it says 13-14 on the instant economy. I think the truck handles my rig pretty good.

Gatordad
07-29-2008, 09:59 PM
I let Donnie back my truck in because he doesn't need a pull thru.

lawnspecialties
07-29-2008, 11:21 PM
That seems very odd about the OD. What rear end gear ratio do you have? Mine is the 3.73 and our (former) Puma weighed a little over 7000 lbs. With the golf cart, we easily exceeded 8,000 and once we hit the interstate, it was overdrive all the way.

As far as I know, tow/haul just extends the shift points and creates downshifting to assist braking. My overdrive would always kick in around 55-65 mph, depending on how hard I was on the accelerator.

As for the mpg, we always got a little over 8 but we would be running 70-75 mph the entire trip. That usually created about 20 psi of boost and you're sucking fuel hard in those conditions.

RvUsa
07-29-2008, 11:47 PM
Well you know what I think about my truck... LOL. 08 f-350 4x4 dually 6.4 diesel. IT SUCKS, but it will pull an aircraft carrier at 80 mph in OD... LOL

Seriously, my 03 would go into OD as well, I think you may have a problem.... Even my dad's excursion with a v-10 towed in OD. So it isn't a Ford thing. Maybe have someone pull codes and see if there is any thing showing up.

BTW 03 got 14 towing 19 empty, 08 get 7 towing and 12 empty...:mad:

bradisgoofy
07-30-2008, 12:50 AM
I have an '04 Dodge Ram One Ton with the Cummins 5.9 Turbo Diesel. I HAD a Carriage Cameo 36' 5er that weighed close to 14,000 loaded. I got 10 to 12 mpg doing 65mph going to FW and back. The only time I took it out of OD was going up long hills and in the mountains. My owners manual said to take it out of OD if the transmission is "searching" in and out of OD.

LarryJ
07-30-2008, 03:14 AM
I have a question for you guys with diesels puling your trailers. I have a 2005 f-350 4x4 with the 6.0 diesel. I am pulling a 8000 pound TT toy hauler empty(11,500 loaded and I have not pulled it loaded yet) My truck will not pull my trailer in overdrive which is making me get 5 mpg:eek: . So what I was wanting to know is how is every body else doing. What truck are you pulling with, how much weight are you pulling, and will it hold overdrive. Oh yeah whats your mpg while towing ??? Thanks in advance.:thumbsup2

Something doesn't sound right. I have the measly 7.3L which is detuned in my Van because of the lack of an intercooler and my trailer GVW is around 7500 and on our last trip to FW from just outside of D.C. I weighed in at 16K GCW. I towed all the way to FW on I-95/I-4 in OD with the cruise control on and never dropped out of either except for the bridge going from Ga. into Fl.

I got 10.5 mpg for mileage.

Larry

kc5grw
07-30-2008, 06:46 PM
My trailer is pretty close to 11000 loaded. I don't have any trouble pulling in OD. Then again it might have something to do with the manual tranny and the 4.10 gears in back. I typically get 9-9.5. I usually drive around 65.

LONE-STAR
07-30-2008, 10:57 PM
Then again it might have something to do with the manual tranny and the 4.10 gears in back.

That would be it not to mention the 7.3

disney4dan
07-31-2008, 05:56 AM
I have a question for you guys with diesels puling your trailers. I have a 2005 f-350 4x4 with the 6.0 diesel. I am pulling a 8000 pound TT toy hauler empty(11,500 loaded and I have not pulled it loaded yet) My truck will not pull my trailer in overdrive which is making me get 5 mpg:eek: . So what I was wanting to know is how is every body else doing. What truck are you pulling with, how much weight are you pulling, and will it hold overdrive. Oh yeah whats your mpg while towing ??? Thanks in advance.:thumbsup2

I just spoke with my father last night who has the 06 F-350 extended cab, 4x4 with 6.0 PSD and automatic transmission, 3.73 gears and he said he's been getting between 14 and 16 mpg pulling loads (mainly lumber and construction items) on flat land. Not as much wind drag as a TT or 5er, but the loads have been in the 12,000 pound range. He get's the 3.73 gears because he always gets the 4x4. Said that if he ever has to struggle pulling a heavy load, he just gears down via the transfer case and uses 4low, but has almost never had to do that. I had to do that once when shuffling the logs up the 1,000 foot driveway to the building site, had to stop on a steep section because something had fallen in the path. Was able to get moving again in 4low.

tungpo1
07-31-2008, 08:09 AM
I have a question for you guys with diesels puling your trailers. I have a 2005 f-350 4x4 with the 6.0 diesel. I am pulling a 8000 pound TT toy hauler empty(11,500 loaded and I have not pulled it loaded yet) My truck will not pull my trailer in overdrive which is making me get 5 mpg:eek: . So what I was wanting to know is how is every body else doing. What truck are you pulling with, how much weight are you pulling, and will it hold overdrive. Oh yeah whats your mpg while towing ??? Thanks in advance.:thumbsup2

Banks kit will get that diesel humming:thumbsup2

LONE-STAR
07-31-2008, 10:54 AM
I just spoke with my father last night who has the 06 F-350 extended cab, 4x4 with 6.0 PSD and automatic transmission, 3.73 gears and he said he's been getting between 14 and 16 mpg pulling loads (mainly lumber and construction items) on flat land. Not as much wind drag as a TT or 5er, but the loads have been in the 12,000 pound range. He get's the 3.73 gears because he always gets the 4x4. Said that if he ever has to struggle pulling a heavy load, he just gears down via the transfer case and uses 4low, but has almost never had to do that. I had to do that once when shuffling the logs up the 1,000 foot driveway to the building site, had to stop on a steep section because something had fallen in the path. Was able to get moving again in 4low.

My problem is that it won't go into overdrive (really Ford told me they don't have overdrive. Its a 5th gear but no matter my truck wont get in it when pulling.) while pulling my TT making me get 5mpg. But I can pull it.

Banks kit will get that diesel humming:thumbsup2

I have been looking into after market mod's for it but not real sure which one to get. The 6.0 is a very problem pron motor and ford says it is already running at max power. So they say if I add more power and something fails I am on my own forget about the warranty.

LONE-STAR
07-31-2008, 09:40 PM
My truck came with 3.73 gears. Do ya'll thank since I put a 3 inch leveling kit on the front and 35" tires on it that maybe I need to change my gears to 4:10 or 4:56 :confused3 . Any help would be great thanks.

kc5grw
08-01-2008, 07:51 PM
Here's a link to a site that will calculate your effective gear ratio with the 35s assuming you know the diameter of the stock tires.

http://www.4lo.com/calc/geartire.htm

Here's a link on the same site that will give you tire diameter if you just know the metric dimensions

http://www.4lo.com/calc/gearmetric.htm

Minnie's Mate
08-04-2008, 01:25 PM
Hi Lonestar, you're getting over my head when you start talking changing rear end gear ratios. But my first diesel was an '05 F-250 PSD. My Airstream weighs about 7,000 LBS loaded and my truck had the 3.73 rear end and was a two wheel drive, extended cab.

The transmission in the PSD actually has six gears. You only use five of them when in either regular or tow/haul mode. When you switch to the tow/haul mode, you use four of the same gears that you use in regular mode and switch out one of the mid-range gears for a towing mode gear to maximize your power band. I forget which one. Plus you change your shift points as stated before. My '05 shifted into the final gear (overdrive as you say) in the tow/haul mode at around 65-70 MPH. Again, as was said, depending on the load on the engine such as hills, acceleration, etc. I always used the cruise control on the interstate and got 12.6 on average including having the golf cart in the bed of the truck (increased wind resistance). This was setting the cruise on, dare I say it, 75 MPH. At this speed, BTW, my tach read the same as it did at 55 MPH in tow/haul mode (same tach, different gear).

In December I traded trucks because the seats were uncomfortable and really didn't fit my back and had begun to irritate an old lower back injury to the point that I was having to undergo physical therapy. The '08s have been redesigned from the ground up including the suspension, drive-train, interior including seats, and the exterior styling.

The styling was a non-issue for me, but the ride was what was important to me. The seats in the new design fit my back perfectly, the ride is more like that of a 1/2 ton and the only time I really get the firmness of the 3/4 ton suspension is with the golf cart in the bed and the trailer in tow.

The bad part is the fuel economy. I started getting 9.6 MPG's towing and after 16K miles, I don't get much better with or without the golf cart. Part of that is the new ULSD diesel fuel. Part of that is the "afterburner" (diesel particulate filter in the exhaust system which uses diesel to burn off the particulates) and catalytic converter that gives the emissions equal to a gasoline engine. When I got my first oil change I asked the dealer to check the programming and see if the mechanic could get me any better mileage and told him my driving habits. When I picked the truck up, I was told that there had been a service bulletin issued and they had updated the program. This got me about an additional MPG on the daily commute and about one when towing. Disappointing, but an improvement just the same.

I would suspect that you are either towing too slow to reach a speed to shift into overdrive in the tow/haul mode or you might need to ask your Ford dealer's service department to see if there has been a service bulletin issued to reprogram your computer control system.

Either way, always use the tow/haul mode when towing. It is there to protect your transmission and with the heavy load you tow it isn't worth stressing your drive-train just to save a few...ok quiet a few...pennies on fuel.

LONE-STAR
08-04-2008, 09:36 PM
Hi Lonestar, you're getting over my head when you start talking changing rear end gear ratios. But my first diesel was an '05 F-250 PSD. My Airstream weighs about 7,000 LBS loaded and my truck had the 3.73 rear end and was a two wheel drive, extended cab.

The transmission in the PSD actually has six gears. You only use five of them when in either regular or tow/haul mode. When you switch to the tow/haul mode, you use four of the same gears that you use in regular mode and switch out one of the mid-range gears for a towing mode gear to maximize your power band. I forget which one. Plus you change your shift points as stated before. My '05 shifted into the final gear (overdrive as you say) in the tow/haul mode at around 65-70 MPH. Again, as was said, depending on the load on the engine such as hills, acceleration, etc. I always used the cruise control on the interstate and got 12.6 on average including having the golf cart in the bed of the truck (increased wind resistance). This was setting the cruise on, dare I say it, 75 MPH. At this speed, BTW, my tach read the same as it did at 55 MPH in tow/haul mode (same tach, different gear).

In December I traded trucks because the seats were uncomfortable and really didn't fit my back and had begun to irritate an old lower back injury to the point that I was having to undergo physical therapy. The '08s have been redesigned from the ground up including the suspension, drive-train, interior including seats, and the exterior styling.

The styling was a non-issue for me, but the ride was what was important to me. The seats in the new design fit my back perfectly, the ride is more like that of a 1/2 ton and the only time I really get the firmness of the 3/4 ton suspension is with the golf cart in the bed and the trailer in tow.

The bad part is the fuel economy. I started getting 9.6 MPG's towing and after 16K miles, I don't get much better with or without the golf cart. Part of that is the new ULSD diesel fuel. Part of that is the "afterburner" (diesel particulate filter in the exhaust system which uses diesel to burn off the particulates) and catalytic converter that gives the emissions equal to a gasoline engine. When I got my first oil change I asked the dealer to check the programming and see if the mechanic could get me any better mileage and told him my driving habits. When I picked the truck up, I was told that there had been a service bulletin issued and they had updated the program. This got me about an additional MPG on the daily commute and about one when towing. Disappointing, but an improvement just the same.

I would suspect that you are either towing too slow to reach a speed to shift into overdrive in the tow/haul mode or you might need to ask your Ford dealer's service department to see if there has been a service bulletin issued to reprogram your computer control system.

Either way, always use the tow/haul mode when towing. It is there to protect your transmission and with the heavy load you tow it isn't worth stressing your drive-train just to save a few...ok quiet a few...pennies on fuel.

Funny story the only reason I like my truck is because it is so comfortable. I looked at the 08 and they where not as comfortable to me because they don't have as much leg room. I am pretty tall (not Rvusa tall but 6'2") with bad knees so leg room is important to me. Thanks for the info though. I thank I am going to try this http://www.superchips.com/products.php?pk=54&pvk=114&cmk=253&pname=Ford+05-08+Mustangs%2C+04-08+Expedition%2C+04-08+F-Series+V8+Gas+%26+Rangers%2C+99-08+Diesel+Pickup+%26+Excursion
I like the 2 year power train warranty and I talked to them and they said even towing my EGT's would stay well within there limits.

LONE-STAR
08-04-2008, 09:38 PM
But please keep the info coming.:thumbsup2

bigdisneydaddy
08-05-2008, 07:03 AM
I dont have a lot of experience with the 6.0, the rumblings I have heard is that it didnt like the power adders.

Have you had the truck specifically checked out by someone familiar with this engine ? I would be curious what an evaluation of the injectors and fuel system would yield. It almost sounds like you have a restriction somewhere, was the truck always like this ? I would avoid a power adders until I was sure that the truck was running right.

My 05 Chevy gets about 11-11 1/4 on summer fuel and will only come out of OD a few times between home and Florida. In the winter my mileage will drop to about 10 until I get south of Cincinatti and the amount of kerosene in the fuel goes down. I always tow in tow/haul mode and typically run between 60-65 MPH. My trailer weighs a little under 9K fully loaded.

The biggest single improvement I made was the 4" turbo back exhaust. The 05 LLY series Duramax runs hot, I have made several modifications to the truck to help it shed heat but the exhaust was the most effective. I do run a towing programmer and that also helped with the mileage.

My best advice would be to find seek out someone with 6.0 experience and pick their brain for possible solutions. An online forum may be helpful also but dont put too much on what is said there until you can sort out the personalities a little.

Good luck

Minnie's Mate
08-05-2008, 09:58 AM
Funny story the only reason I like my truck is because it is so comfortable. I looked at the 08 and they where not as comfortable to me because they don't have as much leg room. I am pretty tall (not Rvusa tall but 6'2") with bad knees so leg room is important to me. Thanks for the info though. I thank I am going to try this http://www.superchips.com/products.php?pk=54&pvk=114&cmk=253&pname=Ford+05-08+Mustangs%2C+04-08+Expedition%2C+04-08+F-Series+V8+Gas+%26+Rangers%2C+99-08+Diesel+Pickup+%26+Excursion
I like the 2 year power train warranty and I talked to them and they said even towing my EGT's would stay well within there limits.
I'm 5'-6" so that might make a difference in the comfort level of the seats. Leg room is different, but not an issue for me. I have a friend that is way taller than me, maybe 6'-1" or 6'-2" and he got his '08 before me and his recommendation was the basis for my knowledge of how the seats were more comfortable. He had an Excursion prior to his '08 F-250.

kc5grw
08-05-2008, 03:27 PM
The only thing I didn't mention about my setup is that I also use a Hyperchips Power Programmer II set to Tow mode. I think it is roughly 30 extra HP and 70 extra ft.lbs. of torque. I've played with the performance mode a couple of times, but I don't have any exhaust or intake mods and I can really get the EGTs to climb pretty fast. I've been pretty satisfied running the thing in tow mode and there is a big difference from stock mode.

bigdisneydaddy
08-05-2008, 06:37 PM
The only thing I didn't mention about my setup is that I also use a Hyperchips Power Programmer II set to Tow mode. I think it is roughly 30 extra HP and 70 extra ft.lbs. of torque. I've played with the performance mode a couple of times, but I don't have any exhaust or intake mods and I can really get the EGTs to climb pretty fast. I've been pretty satisfied running the thing in tow mode and there is a big difference from stock mode.


I run the Hypertech on mine in #3 all the time. For some crazy reason the highest setting yields the best mileage. An aftermarket exhaust will also allow the programmer to fuel the truck more efficiently, mine was good before the exhaust and even better after. I rarely use the extra power, the programmer does make the truck easier to drive in that it comes into the power sooner and doesnt require as much throttle pedal travel to get the boost up.

LONE-STAR
08-05-2008, 07:51 PM
I dont have a lot of experience with the 6.0, the rumblings I have heard is that it didnt like the power adders.

Have you had the truck specifically checked out by someone familiar with this engine ? I would be curious what an evaluation of the injectors and fuel system would yield. It almost sounds like you have a restriction somewhere, was the truck always like this ? I would avoid a power adders until I was sure that the truck was running right.

My 05 Chevy gets about 11-11 1/4 on summer fuel and will only come out of OD a few times between home and Florida. In the winter my mileage will drop to about 10 until I get south of Cincinatti and the amount of kerosene in the fuel goes down. I always tow in tow/haul mode and typically run between 60-65 MPH. My trailer weighs a little under 9K fully loaded.

The biggest single improvement I made was the 4" turbo back exhaust. The 05 LLY series Duramax runs hot, I have made several modifications to the truck to help it shed heat but the exhaust was the most effective. I do run a towing programmer and that also helped with the mileage.

My best advice would be to find seek out someone with 6.0 experience and pick their brain for possible solutions. An online forum may be helpful also but dont put too much on what is said there until you can sort out the personalities a little.

Good luck

Went and picked the brain of the best ford diesel man I know of today. He said that is pretty much normal :mad: . I have been reading alot of the diesel forums nobody really has my problem. I am going to order a superchips cortex tomorrow. It comes with a 2 year powertrain warranty if ford says no to a claim due to the truck having a programer in it, superchips will pay to fix it. They told me that is how sure they are that there programer will not hurt my truck.

LONE-STAR
08-05-2008, 07:56 PM
I run the Hypertech on mine in #3 all the time. For some crazy reason the highest setting yields the best mileage. An aftermarket exhaust will also allow the programmer to fuel the truck more efficiently, mine was good before the exhaust and even better after. I rarely use the extra power, the programmer does make the truck easier to drive in that it comes into the power sooner and doesnt require as much throttle pedal travel to get the boost up.

Super chips told me the reason you get the best mileage in the highest setting is at highway speeds it makes the truck spray a finer mist of diesel.

bigdisneydaddy
08-06-2008, 07:32 AM
Super chips told me the reason you get the best mileage in the highest setting is at highway speeds it makes the truck spray a finer mist of diesel.


I think it has more to do with injector timing and pulse.

LONE-STAR
08-06-2008, 07:19 PM
I think it has more to do with injector timing and pulse.

You are probably right. That is just what the guy on the phone told me.

Brer Bear
08-10-2008, 03:08 PM
I get about 12mpg pulling 8K with my 07 Dodge 5.9 cummings. If I keep my foot out of it I can get up to 13mpg, but usually I can't resist keeping the train moving!

bigdisneydaddy
08-10-2008, 07:02 PM
I get about 12mpg pulling 8K with my 07 Dodge 5.9 cummings. If I keep my foot out of it I can get up to 13mpg, but usually I can't resist keeping the train moving!


I think the 5.9 Cummins is the mileage king in light duty trucks, you see a lot of hotshotters driving them for that exact reason.

LONE-STAR
08-10-2008, 10:53 PM
I get about 12mpg pulling 8K with my 07 Dodge 5.9 cummings. If I keep my foot out of it I can get up to 13mpg, but usually I can't resist keeping the train moving!

I have been thinking of getting a dodge but my ford is so comfortable. Is your dodge a auto or 6 speed?

LONE-STAR
08-10-2008, 10:55 PM
I think the 5.9 Cummins is the mileage king in light duty trucks, you see a lot of hotshotters driving them for that exact reason.

I think the 5.9 is king period.

bigdisneydaddy
08-11-2008, 07:03 AM
I think the 5.9 is king period.

We had several of them at work in FL60 Freightliners and have had 2 catastrophic failures, one they paid for and one we took the hit on.

If I had the choice between truck and engine I would take the 5.9 with a 1000 Allison in a Chevy truck.

Brer Bear
08-11-2008, 04:03 PM
My 5.9 is an auto. I thought about the 6 spd, but I'm just too lazy. I do think the exhaust brake option would be handy!

I do miss my Ford F350 crew cab. Our Mega cab has more room, but the seats are not nearly as comfy!

My ideal truck: F350 body, Chevy ride, Allison Tranny, and 5.9 juiced! :wizard: