Terrible fuel mileage 05 6.0L - Ford Powerstroke Diesel Forum
6.0L Problems Forum Having Trouble? Post here

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 16 Old 07-15-2013, 09:20 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: May 2013
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Terrible fuel mileage 05 6.0L

Here is what is done to my truck: h-11 studs, RCD EGR delete, brand new oil cooler, sinister coolant filter, s&b intake, 4" dual straight pipe, SCT livewire TS with looney wild from Vivian, blue spring upgrade.

PROBLEM: I only get about 13.5 mpg, usually less, with cruise set around 75 and only slightly hilly driving. I haven't had time to test injectors yet, but what else could it be?

I run T-6 full synthetic with archoil, and have a 4.5" lift with 35s.

I feel like I should get way better mileage than that. Any input would be great.
gleason51 is offline  
Sponsored Links
Advertisement
 
post #2 of 16 Old 07-15-2013, 09:59 PM
Powerstroke.org Rookie
 
Join Date: Jul 2013
Location: Fannin County, Texas
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Has the mpg suddenly dropped? Like recently you noticed it, and it had been better prior to this?

Any other symptoms like more smoke, etc?
Partychief67 is offline  
post #3 of 16 Old 07-15-2013, 10:06 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: May 2013
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Ive only owned it for a few months. Maybe i just didnt check it out well enough before i bought it. Mileage has always been poor but i hoped after the new tuner with custom tunes, new exhaust, and new oil cooler that it would get better. Truck does smoke white a little upon start up sonetimes, and can idle/run rougher when cold. More black smoke than before, but i figured that was the exhaust and tunes. All I can think is injectors. But would that kill my mileage that much? I have buddies with 6.0s getting 17-19+
gleason51 is offline  
post #4 of 16 Old 07-16-2013, 01:59 PM
Powerstroke.org Fanatic
 
Join Date: Nov 2009
Posts: 96
Thanks: 5
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
That mileage doesn't sound too terrible to me. It may be a little low but with 35's and a lift...that might be where you'll sit. Mine is an FX-4 lifted a couple inched with 315's (33's) stock other than blue spring, coolant filter, egr delete and I avg about 15.
I have found it doesn't take much to get the mileage to drop to 13.5-14. Got 16 once on a long trip cruise set at 62

Chuck Norris once visited the Virgin Islands, they are now known, simply as, The Islands
sixoh is offline  
post #5 of 16 Old 07-16-2013, 04:49 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: May 2013
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Now the trip this morning was 11.4 mpg. I did cruise along a little faster today but damn that's terrible
gleason51 is offline  
post #6 of 16 Old 07-16-2013, 07:37 PM
Powerstroke.org Fanatic
 
Join Date: Feb 2013
Location: Outer Banks of NC
Posts: 102
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I was getting poor mileage when my ficm was going out. Might be worth checking the ficm voltage..
darenative is offline  
post #7 of 16 Old 07-16-2013, 07:46 PM
Premium Member
 
Ford_Fan1's Avatar
 
Join Date: May 2013
Posts: 1,425
Thanks: 11
Thanked 53 Times in 49 Posts
Mentioned: 1 Post(s)
Quoted: 6 Post(s)
Feedback Score: 3 reviews
Quote:
Originally Posted by darenative View Post
I was getting poor mileage when my ficm was going out. Might be worth checking the ficm voltage..
same here. When my ficm was bad I got mpgs between 9 and 13


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

"Pickle Monster"
2004 F-350 King Ranch built 3/24/04
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

4" lift, 5" MBRP TB back exhaust
EGR MIA
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
,ported intake, 05-07 intake horn
CCSB
FX4
Firestone airbag suspension in the rear with on-board compressor
Monitored with Edge Insight CS, tuned by Gearhead
high idle mod, Atlas 40 FICM tune, Cat ELC,
2008 taillights, 08 mirrors, smoked marker lights, harpooned fuel tank, DIY headache rack, Bushwacker fender flares
Ford_Fan1 is offline  
post #8 of 16 Old 07-16-2013, 07:56 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: May 2013
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Ficm voltage from the livewire 48-49 volts.
gleason51 is offline  
post #9 of 16 Old 07-17-2013, 04:16 PM
Powerstroke.org Fanatic
 
Join Date: Feb 2013
Location: Outer Banks of NC
Posts: 102
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by gleason51 View Post
Ficm voltage from the livewire 48-49 volts.
When? First thing in the a.m. or after you drive 20 miles?
darenative is offline  
post #10 of 16 Old 07-17-2013, 04:34 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: May 2013
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
It pretty much is always right around that voltage.
gleason51 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome