weird mpg problem - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-26-2013, 01:06 PM
Powerstroke.org Rookie
 

Join Date: Nov 2012
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
weird mpg problem

If I fill up same pump same station all the time.
If I fill up at 1/4 tank I get 18 MPG
If I fill up at 1/2 or less I get 14 MPG

Both numbers are hand calculated. I have a RR, intake, exhaust, HPX, DP Tunes (80 econo). I can do this over and over and over and get the same results every time. I have drop the tank and put a new pickup tube without the bypass. Pre liminary fuel filter oil and fuel air filters all new.
Anybody have any ideas why the weird mileage.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 07-26-2013, 11:34 PM
Serving Our Country!
 

Join Date: Aug 2007
Location: Manor, TX
Posts: 2,787
Thanks: 0
Thanked 4 Times in 4 Posts
Feedback Score: 2 reviews
Are you waiting for all the foam to settle so you can fill to the edge of the filler every time?
Reply With Quote Quick reply to this message
  #3  
Old 07-27-2013, 03:54 AM
Powerstroke.org Rookie
 

Join Date: Nov 2012
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I fill it several more times after it stops the first time. I usually stop it on an even dollars 102.00 instead of 102.86. I don't know why probably just my OCD acting up.
Reply With Quote Quick reply to this message
  #4  
Old 07-27-2013, 08:56 PM
Serving Our Country!
 

Join Date: Aug 2007
Location: Manor, TX
Posts: 2,787
Thanks: 0
Thanked 4 Times in 4 Posts
Feedback Score: 2 reviews
Try ignoring the dollar amount and filling right to the edge of the filler each time. If you just wait for it to shut off you won't get a consistent reading.
Reply With Quote Quick reply to this message
  #5  
Old 07-28-2013, 12:35 PM
Powerstroke.org Fanatic
 

Join Date: Jun 2012
Location: West Georgia
Posts: 124
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Try ignoring the dollar amount and filling right to the edge of the filler each time. If you just wait for it to shut off you won't get a consistent reading.
I agree. It takes me a long time to get fuel. I would say 30 minutes at a gas station is not exaggerating! That includes going inside usually though
Reply With Quote Quick reply to this message
  #6  
Old 07-28-2013, 12:40 PM
Compression Ignition Addict
 

Join Date: Feb 2009
Location: Nacogdoches, TX
Posts: 11,043
Thanks: 0
Thanked 12 Times in 12 Posts
Feedback Score: 0 reviews
You can't use the 1/4, 1/2, 3/4, or F ratings on the gauge to figure MPG. You have to fill up full the same way time after time.
Reply With Quote Quick reply to this message
  #7  
Old 07-28-2013, 01:23 PM
Powerstroke.org Rookie
 

Join Date: Nov 2012
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I do fill up tge same way. If I am going on a long trip I fill up before I start out in it. Some times it happens to be after 1 or 200 miles. I calculate the mpg just because I can. The 1/4 or 1/2 tank doesn't figure into the equation. It was just a place marker that I noticed.
Reply With Quote Quick reply to this message
  #8  
Old 07-28-2013, 01:31 PM
Compression Ignition Addict
 

Join Date: Feb 2009
Location: Nacogdoches, TX
Posts: 11,043
Thanks: 0
Thanked 12 Times in 12 Posts
Feedback Score: 0 reviews
Then I don't get what you're asking, since you mentioned you MPG is different at 1/4 and 1/2 tank.
Reply With Quote Quick reply to this message
  #9  
Old 07-28-2013, 01:39 PM
Powerstroke.org Rookie
 

Join Date: Nov 2012
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Miles / gal =MPG right? So if I fill up at 450 miles or 200 miles it should be about tge same MPG?The gallons should be proportional to tge miles.
So my question is what could be the causing the difference?
Reply With Quote Quick reply to this message
  #10  
Old 07-28-2013, 01:40 PM
Compression Ignition Addict
 

Join Date: Feb 2009
Location: Nacogdoches, TX
Posts: 11,043
Thanks: 0
Thanked 12 Times in 12 Posts
Feedback Score: 0 reviews
Oh you mean that if you drive until a half tank or until a quarter tank the math is different. Gotcha.
Reply With Quote Quick reply to this message
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

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
Display Modes

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



All times are GMT -8. The time now is 08:49 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors