Fuel mileage? - Ford Truck Enthusiasts Forums

Notices
6.7L Power Stroke Diesel 2011-current Ford Powerstroke 6.7 L turbo diesel engine
Sponsored by:
Sponsored by:

Fuel mileage?

  #1  
Old 09-26-2018, 08:26 AM
Readgriff
Readgriff is offline
Senior User
Thread Starter
Join Date: May 2017
Location: Michigan
Posts: 134
Readgriff is starting off with a positive reputation.
Fuel mileage?

2017 6.7 mpg
I have read a few different threads on this but most are realated to towing.
I ve noticed in the last 5,000 miles or so my mileage has dropped overall 3to 5 miles per gallon.
I used to average 17 to 18 now it is 14 to 15 even when I really watch my speed say 65 and under I cannot get over 15mpg not towing.
I changed the fuel filters at 20,000 miles have 23,000 miles now
Any ideas what happened to my fuel mileage or what I could check?
Thanks
 
  #2  
Old 09-26-2018, 11:18 AM
RobRoy32
RobRoy32 is offline
Junior User
Join Date: Feb 2015
Location: Alabama
Posts: 60
RobRoy32 is starting off with a positive reputation.
Any check engine light?
Do you have the ability to monitor non-displayed PIDs? such as EGT?
I had a check engine light for Low DEF pressure, caused me to lose a few miles per gallon on mileage.
If your EGTs are constantly reading above 1k, you may be stuck in a regen status.
Maybe try changing up where you are getting your fuel, or adding a cetain booster such as PM22a

Let us know if you find anything that fixes this.
 
  #3  
Old 09-26-2018, 11:47 AM
Readgriff
Readgriff is offline
Senior User
Thread Starter
Join Date: May 2017
Location: Michigan
Posts: 134
Readgriff is starting off with a positive reputation.
Rob Roy
I do not have any check engine lights.
How would I check PIDs such as EGT
Thanks
Dave Read
 
  #4  
Old 09-26-2018, 12:19 PM
Superdave71
Superdave71 is online now
Senior User
Join Date: Dec 2016
Location: Knightstown Indiana
Posts: 298
Superdave71 is gaining momentum as a positive member of FTE.
Hung up brake caliper, Biodiesel blends will negatively effect mileage. I’ve also found I don’t see the good numbers until the truck has been running 40 minutes and trans temp is up to 200F. Have you changed wheels/tires?
 
  #5  
Old 09-26-2018, 01:30 PM
Readgriff
Readgriff is offline
Senior User
Thread Starter
Join Date: May 2017
Location: Michigan
Posts: 134
Readgriff is starting off with a positive reputation.
I have been using Shell diesel fuel mostly.
Have not changed tire size
Fuel mileage seems to be going down even with summer fuel
Used to see 18 mph avg regularly now 15 mph or less.


 
  #6  
Old 09-26-2018, 01:51 PM
HRTKD's Avatar
HRTKD
HRTKD is offline
Post Fiend
Join Date: Oct 2015
Location: Somewhere south of Denver
Posts: 5,931
HRTKD has a brilliant futureHRTKD has a brilliant futureHRTKD has a brilliant futureHRTKD has a brilliant futureHRTKD has a brilliant futureHRTKD has a brilliant futureHRTKD has a brilliant futureHRTKD has a brilliant futureHRTKD has a brilliant futureHRTKD has a brilliant futureHRTKD has a brilliant future
Originally Posted by Superdave71 View Post
Have you changed wheels/tires?
A lot of people don't realize how much the tires can affect MPG. Some tires are a LOT heavier than OEM. That unsprung weight can change MPG by more than you think. When I used a load range D on my half ton truck that came with P metric tires I could count on a decrease of MPG by at least 1.
 
  #7  
Old 09-26-2018, 02:38 PM
'65Ford
'65Ford is offline
Posting Guru
Join Date: Jan 2016
Posts: 1,167
'65Ford is gaining momentum as a positive member of FTE.
Mouse nest in the air filter box?

Biofuel will noticeably drop your mpg.
 
  #8  
Old 09-26-2018, 03:06 PM
Readgriff
Readgriff is offline
Senior User
Thread Starter
Join Date: May 2017
Location: Michigan
Posts: 134
Readgriff is starting off with a positive reputation.
I just vacuumed out the air box and looked at the filter.
The air flow gauge still shows air filter as having good flow.
Maybe I should change out the air filter and see if that helps with fuel mph.
 
  #9  
Old 09-26-2018, 04:02 PM
'65Ford
'65Ford is offline
Posting Guru
Join Date: Jan 2016
Posts: 1,167
'65Ford is gaining momentum as a positive member of FTE.
Smoke at idle? ...sign of leaky injector.
 
  #10  
Old 09-26-2018, 04:40 PM
Readgriff
Readgriff is offline
Senior User
Thread Starter
Join Date: May 2017
Location: Michigan
Posts: 134
Readgriff is starting off with a positive reputation.
I haven’t noticed any smoke and tail pipe is clean.
 
  #11  
Old 09-26-2018, 09:04 PM
Paw's 150 Lariat's Avatar
Paw's 150 Lariat
Paw's 150 Lariat is online now
Posting Guru
Join Date: Aug 2006
Location: Raceland, La.
Posts: 1,883
Paw's 150 Lariat is a splendid one to beholdPaw's 150 Lariat is a splendid one to beholdPaw's 150 Lariat is a splendid one to beholdPaw's 150 Lariat is a splendid one to beholdPaw's 150 Lariat is a splendid one to beholdPaw's 150 Lariat is a splendid one to beholdPaw's 150 Lariat is a splendid one to beholdPaw's 150 Lariat is a splendid one to behold
Originally Posted by Readgriff View Post
I just vacuumed out the air box and looked at the filter.
The air flow gauge still shows air filter as having good flow.
Maybe I should change out the air filter and see if that helps with fuel mph.
I changed my air filter at 16K miles and couldn't believe how dirty it was. Price on these filters from Ford is crazy...in the 80 to 90 dollar range. I may end up getting a few online as they show close to 50 bucks. My fuel mileage has been fairly constant since I bought the truck last year...15 mpg in town and 17 on the hwy. Better then what I expected from a 350 DRW with 4.10's.
 
  #12  
Old 09-27-2018, 06:44 PM
Painted Horse's Avatar
Painted Horse
Painted Horse is online now
Postmaster
Join Date: Nov 2005
Posts: 2,655
Painted Horse has a brilliant futurePainted Horse has a brilliant futurePainted Horse has a brilliant futurePainted Horse has a brilliant futurePainted Horse has a brilliant futurePainted Horse has a brilliant futurePainted Horse has a brilliant futurePainted Horse has a brilliant futurePainted Horse has a brilliant futurePainted Horse has a brilliant futurePainted Horse has a brilliant future
Around here, Winter fuel starts October 1st. I just wonder if your refineries have already started shipping Winter Grade fuel.
I always loose a couple miles per gallon when winter fuel shows up.
 
  #13  
Old 09-27-2018, 08:15 PM
Readgriff
Readgriff is offline
Senior User
Thread Starter
Join Date: May 2017
Location: Michigan
Posts: 134
Readgriff is starting off with a positive reputation.
My fuel mileage has been down for the last couple of months or say the last 3,000 miles.
 
  #14  
Old 09-28-2018, 06:35 AM
Deuce40s
Deuce40s is offline
Elder User
Join Date: Oct 2013
Location: NC
Posts: 648
Deuce40s has a very good reputation on FTE.Deuce40s has a very good reputation on FTE.Deuce40s has a very good reputation on FTE.
Is your 15mpg all highway?
Have you confirmed the computer is accurate by calculating at the pump?
 
  #15  
Old 09-28-2018, 07:14 AM
Readgriff
Readgriff is offline
Senior User
Thread Starter
Join Date: May 2017
Location: Michigan
Posts: 134
Readgriff is starting off with a positive reputation.
I have not done a pump calculation.
I’m going by my past driving with the on board calculations used to be 18/ 19 all the time now it is 14/15.
 

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: