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Old Apr 5, 2019 | 11:21 AM
  #1  
gpeade's Avatar
gpeade
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From: P.G. VA
Question about tune

I have a stock 2003 6.0 with 192k miles. Recently
inherited this truck and have no prior experience with diesels. When I brought it home I was towing a 20’ enclosed trailer with less than 1,000lbs cargo inside. MPG average was just over 9 which to me sucks. I also have a 7000lb camper I am going to start towing. My question is if a towing tune will help with MPG without risking damage to the motor? I have heard that aftermarket tuners contributed to many of the failures on this engine. Not looking for more power just better MPG.
 
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Old Apr 6, 2019 | 10:19 PM
  #2  
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varminthunter243
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From: Bloomfield, NM
I'd first try to figure out why you're only getting 9 mpg. Seems drastically low to me.
 
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Old Apr 7, 2019 | 10:33 AM
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navistarnut
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From: NW IA
The kids 03 gets 16 towing a 24' enclosed with 9k lbs worth of snowmobiles, so yes that is pretty low.
He has larger tires as well.

You should just start with the basics.
What is the maint history?
There are some basic maintenance things that might get you another 2 mpg right there.

After that perhaps start with a FICM tune. Several here, myself included, like the Atlas 40. It won't stretch the head bolts like other hot tunes will and many here, myself also lumped in, saw 2 mpg right off the bat.

Still stock exhaust with cats as well?
 
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Old Apr 7, 2019 | 10:34 AM
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FL SuperDuty
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Originally Posted by navistarnut
The kids 03 gets 16 towing a 24' enclosed with 9k lbs worth of snowmobiles, so yes that is pretty low.
He has larger tires as well.

You should just start with the basics.
What is the maint history?
There are some basic maintenance things that might get you another 2 mpg right there.

After that perhaps start with a FICM tune. Several here, myself included, like the Atlas 40. It won't stretch the head bolts like other hot tunes will and many here, myself also lumped in, saw 2 mpg right off the bat.
what the hell, is it 2WD? i barely get 16 unloaded hwy.
 
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Old Apr 8, 2019 | 10:01 PM
  #5  
gpeade's Avatar
gpeade
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From: P.G. VA
Originally Posted by navistarnut
The kids 03 gets 16 towing a 24' enclosed with 9k lbs worth of snowmobiles, so yes that is pretty low.
He has larger tires as well.

You should just start with the basics.
What is the maint history?
There are some basic maintenance things that might get you another 2 mpg right there.

After that perhaps start with a FICM tune. Several here, myself included, like the Atlas 40. It won't stretch the head bolts like other hot tunes will and many here, myself also lumped in, saw 2 mpg right off the bat.

Still stock exhaust with cats as well?
I have no idea the maint history. Truck was bought by a relative last fall. After purchasing it he had the injectors replaced along with several other small items. He passed away in Dec. and I inherited the truck. Everything on the truck is stock except for tires and wheels. They are a little bigger than stock but not by much. Trucks gets 15-16 around town and 19+ on the highway.
I’m not experienced with diesels. What could be causing the low mpg while towing? Granted I was running about 65-70 the whole way from FL but yeah I would think it should do better than 9 mpg.
 
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Old Apr 15, 2019 | 04:20 PM
  #6  
navistarnut's Avatar
navistarnut
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From: NW IA
Originally Posted by FL SuperDuty
what the hell, is it 2WD? i barely get 16 unloaded hwy.
No, lol it's 4x4 with big Nitto Graplers.
It honestly gets that mpg, pushes 21 unloaded. It's always been a good mpg truck.
This is hand fill checks, not the lie o meter
 
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Old Apr 15, 2019 | 05:57 PM
  #7  
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FL SuperDuty
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thats incredible. i have 34” terra grapplers on my 4x4 and i can maybe get 17 if im not driving fast.. what tune are you running?
 
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Old Apr 19, 2019 | 05:36 PM
  #8  
navistarnut's Avatar
navistarnut
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From: NW IA
Originally Posted by FL SuperDuty
thats incredible. i have 34” terra grapplers on my 4x4 and i can maybe get 17 if im not driving fast.. what tune are you running?
Honestly I'm not sure what tune he runs, it's an SCT tuner.
It's custom for TTY's as he is not studded, he was on the phone with them some time ago getting it figured out.
It will get up and scoot, but it's not a towing tune and he does not see quite those numbers unloaded with the tune.
The Atlas 40 helped as well.
 
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