Mpg
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Joined: Feb 2007
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Originally Posted by mattebury
I doubt you went into a regeneration mode while pulling the grade. You had so much heat going through your system pulling 15,000 lbs up the mountain that you were making enough heat on your own to clean the DPF. Regen only happens when there is not enough heat from the engine to burn off the particulates trapped in the filer.
I think the your Mossy tech is just too green when it comes to the 6.4, that he was only guessing as to why you dropped to 40. I'm still guessing that with 15,000 lbs and a 3.73 on a 6% grade is the reason you slowed down.
I think the your Mossy tech is just too green when it comes to the 6.4, that he was only guessing as to why you dropped to 40. I'm still guessing that with 15,000 lbs and a 3.73 on a 6% grade is the reason you slowed down.
I came back from San Felipe MX again went thru the same road I8 to calexico then cross usa border and the truck speed did not drop like last time my speed stayed at 65MPH all the way up the grade and because I was heading to a dry camp I was full 150g water + 2 30g fuel tanks in the trailer were full I still can not find what I did or why the speed did not drop to 40 like the last time.
now what is different is I took the truck for the recall and maybe that is what did it because I think the weather conditions were the same I think for some reason I also beleive the more we towed with it the more it towed with ease.
one thing I must mention is I calculated my MPG to 6.5 MPG twice the same way going in to san felipe and coming back separatly and the result were the same 6.5 MPG.
I am leaving to go there again next week the kids will be off school we are leaving wednsday and coming back sunday and I will let you know how I do going up the grade again as I will be full PETE's CAMP in San Felipe is on the beach and it's a dry camp.
now I must mention that I did the recall to the truck before going on my trip and I did see a slight drop in MPG after doing the recall even not pulling I am only getting 16.5 MPG doing 70MPH compare to 17.5 to 18.0 MPG before the truck has already 6300 miles and I did do the oil change and the air filter change at 5800 miles the dealer said it was too early for both I said it's my $ and my truck just do as I say.
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Joined: Feb 2007
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Originally Posted by Creekowl
The fuel mileage could be better but it is well within acceptable limits for these type of trucks.
I had a 99 F350 crewcab dually, 4wd, with 3:73 gears. My new truck is an 08 F350 crewcab dually, 4wd, with 4:30 gears. The new truck weighs more than the old truck and is rated to tow almost 6,000 pounds more. It is a lot more truck.
I have driven the 08 almost 5,000 miles, most of which has been towing. When not towing it gets 12.8 mpg, or thereabouts depending on the day, with a mix of stop and go city driving. some highway, and some rural roads to and from my house.
Average fuel mileage when towing has been a low of 8.2 when towing 13,400 pounds on an 1,600 mile trip to the mountains and back, and a high of 9.1 when towing 11,000 pounds on mainly flat roads in my state.
These fuel averages are about 1 to 1.5 miles per gallon worse than the 99, and the 08 is not broken in yet and is a lot more enjoyable to drive.
I don't care what anyone says, a truck towing 10,000+ pounds at highway speeds is not going to get much above 10 mpg. Period. I have had friends claim otherwise but mysteriously their claims disappear when we go cross country together, travel the same speed, fuel up at the same fuel stops, and I help them with the math.
I hate to say it, but it is time for someone to paraphrase the old adage, "If you have to ask, you can't afford the fuel." I most often hear this said in relation to fuel for large boats or airplanes, but the analogy is not that far off for heavy trucks engineered to pull heavy loads.
Use the truck for what it was intended and enjoy it.
I had a 99 F350 crewcab dually, 4wd, with 3:73 gears. My new truck is an 08 F350 crewcab dually, 4wd, with 4:30 gears. The new truck weighs more than the old truck and is rated to tow almost 6,000 pounds more. It is a lot more truck.
I have driven the 08 almost 5,000 miles, most of which has been towing. When not towing it gets 12.8 mpg, or thereabouts depending on the day, with a mix of stop and go city driving. some highway, and some rural roads to and from my house.
Average fuel mileage when towing has been a low of 8.2 when towing 13,400 pounds on an 1,600 mile trip to the mountains and back, and a high of 9.1 when towing 11,000 pounds on mainly flat roads in my state.
These fuel averages are about 1 to 1.5 miles per gallon worse than the 99, and the 08 is not broken in yet and is a lot more enjoyable to drive.
I don't care what anyone says, a truck towing 10,000+ pounds at highway speeds is not going to get much above 10 mpg. Period. I have had friends claim otherwise but mysteriously their claims disappear when we go cross country together, travel the same speed, fuel up at the same fuel stops, and I help them with the math.
I hate to say it, but it is time for someone to paraphrase the old adage, "If you have to ask, you can't afford the fuel." I most often hear this said in relation to fuel for large boats or airplanes, but the analogy is not that far off for heavy trucks engineered to pull heavy loads.
Use the truck for what it was intended and enjoy it.
I think when I see post like these and what people are comenting about them that my truck is getting the MPG it should be getting.
Thanks for you honesty and your staight forward talk creekowl
Senior User
Joined: Jun 2007
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From: In My Mind
Originally Posted by drisschoufa
I think when I see post like these and what people are comenting about them that my truck is getting the MPG it should be getting.
Thanks for you honesty and your staight forward talk creekowl
Thanks for you honesty and your staight forward talk creekowl
Guess they have been looking at our bank accounts....
My brother is the buyer of the tractors for the largest trucking company in the US...
Guess I should tell him to stop being concerned about operational economy...They should take that off the list of things to look at when buying tractors....
Hey guess they can't afford it!
Junior User
Joined: Feb 2007
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Originally Posted by jam105
Wow it is impressive that some people think because you are concerned about MPG that you can not afford to own it!
Guess they have been looking at our bank accounts....
My brother is the buyer of the tractors for the largest trucking company in the US...
Guess I should tell him to stop being concerned about operational economy...They should take that off the list of things to look at when buying tractors....
Hey guess they can't afford it!
Guess they have been looking at our bank accounts....
My brother is the buyer of the tractors for the largest trucking company in the US...
Guess I should tell him to stop being concerned about operational economy...They should take that off the list of things to look at when buying tractors....
Hey guess they can't afford it!
there are 2 reasons I am concerned about the MPG 1 because you can not buy the ulsd everywhere and the segond it is because we go to San Felipe MX a lot and from the border it is 115 mile drive there and by the time we crossed the border back to the usa this last trip we were running on fumes let me add that I just decided to use the trailer 30g fuel station for the ulsd because you can not buy it south of the border and i will buy gas locally for my toys.
I love your comment LOL..............
Thread Starter
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Senior User
Joined: Apr 2006
Posts: 349
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From: San Diego, CA
Originally Posted by WolfFox
The mileage doesn’t bother me as much as the thing going into regen and dropping to half power while trying to tow 15K trailer up a hill, like I read here.
DIESEL EXHAUST SYSTEM: OXIDATION CATALYST/DIESELPARTICULATE FILTER SYSTEM (F-SUPER DUTY ONLY)
Your vehicle is equipped with a diesel particulate filter (DPF), which is coupled to a diesel oxidation catalyst, that reduces the amount of harmful exhaust emitted from the tailpipe. As soot gathers in the system it begins to restrict the filter. The soot gathered inside the filter needs to be periodically cleaned. The soot can be cleaned in two different ways; passive regeneration and active regeneration. Both methods occur automatically and require no actions from the driver/operator. During either one of these regeneration methods you may notice an increase/change in exhaust noise/tone.
Passive regeneration
In passive regeneration, the exhaust constituents / temperature are at an appropriate level where some soot can be reduced or oxidized (burned) thus cleaning the filter. This method occurs naturally as a result of normal engine operating conditions (at varying levels due to drive patterns).
Active regeneration
If there is not enough passive regeneration naturally occurring due to vehicle drive patterns, the engine control system will initiate an active regeneration. In an active regeneration, the filter is cleaned by raising the exhaust temperature to a point where the soot is burned away. This is accomplished through various engine actions which raise the exhaust temperature in the oxidation catalyst/DPF system to an appropriate high level where the soot is burned off. After the soot is burned off, the exhaust temperature and back-pressure (restriction) fall back to normal levels.
If I'm pulling a hill with 15k lbs behind me, I'm working that motor enough for a passive regen. I.e. the EGT is high enough in that situation for a passive regen. How hot do you think the EGTs are in a pre '08 6.0L pulling that same hill and load? Pretty darn hot I'd say.
I notice regens when I'm on city streets in stop-n-go traffic, then when at idle, I notice my RPMs are up, but no change in power.
I've got 5,000 miles on my '08 with about 1,500 of them towing a 10,000 lb fiver up some pretty serious grades and have never had an issue of losing power. Like I said, the EGTs are high enough in these situations to burn off the soot in the DPF.
'Nuf said.
I notice regens when I'm on city streets in stop-n-go traffic, then when at idle, I notice my RPMs are up, but no change in power.
I've got 5,000 miles on my '08 with about 1,500 of them towing a 10,000 lb fiver up some pretty serious grades and have never had an issue of losing power. Like I said, the EGTs are high enough in these situations to burn off the soot in the DPF.
'Nuf said.
Posting Guru
Joined: Jul 2006
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From: New York
Congratulations on your new truck. I wouldn't go by that meter as being too precise, especially in such a new truck with no real mileage on it yet. The best way is to hand compute it after at least 3-5 fillups. But good luck with your new truck and tell us how she works out. Maybe post a few pics.