Notices
1994.5 - 1997 7.3L Power Stroke Diesel  

Terrible fuel mileage

Thread Tools
 
Search this Thread
 
Old Jan 22, 2025 | 05:25 AM
  #1  
Stevenm95's Avatar
Stevenm95
Thread Starter
|
Mountain Pass
Liked
Loved
Community Favorite
Joined: Jun 2024
Posts: 209
Likes: 22
From: IL
Terrible fuel mileage

So I know there's a small boost leak from the uppipes waiting to have funds for RiffRaff set. My fuel mileage is garbage I also know winter blend can give MPGs a hit but I'm getting 10MPGA on q good day. Replaced fuel filter still no change. What could I be missing? Is the boost leak responsible?

 
Reply
Old Jan 22, 2025 | 05:32 AM
  #2  
tjc transport's Avatar
tjc transport
i ain't rite
Joined: Mar 2005
Posts: 65,548
Likes: 5,589
From: Marlboro Mental Hospital.
Club FTE Gold Member
oversized tires? is the speedometer accurate?
 
Reply
Old Jan 22, 2025 | 06:32 AM
  #3  
Stevenm95's Avatar
Stevenm95
Thread Starter
|
Mountain Pass
Liked
Loved
Community Favorite
Joined: Jun 2024
Posts: 209
Likes: 22
From: IL
Originally Posted by tjc transport
oversized tires? is the speedometer accurate?
I mean they are all terrain and have the rotational size same as a 33 they are 285/75/r16s. Yes speedometer is correct
 
Reply
Old Jan 22, 2025 | 07:57 AM
  #4  
cleatus12r's Avatar
cleatus12r
Butt-Head
Joined: Apr 2004
Posts: 9,453
Likes: 2,936
From: Reed Point, MT
How long does it sit and idle? Idling is effectively 0 MPG and is rarely factored into efficiency calculations.


Lots of people complain about crappy winter fuel economy and lots of people forget that they start their vehicles and let them run for 10+ minutes every morning before driving away.

Also, I wouldn't trust an aftermarket display for that calculation. The factory PCM doesn't have that data so however Edge programmed their device is going to affect that number.


 
Reply
Old Jan 22, 2025 | 08:47 AM
  #5  
Stevenm95's Avatar
Stevenm95
Thread Starter
|
Mountain Pass
Liked
Loved
Community Favorite
Joined: Jun 2024
Posts: 209
Likes: 22
From: IL
Originally Posted by cleatus12r
How long does it sit and idle? Idling is effectively 0 MPG and is rarely factored into efficiency calculations.


Lots of people complain about crappy winter fuel economy and lots of people forget that they start their vehicles and let them run for 10+ minutes every morning before driving away.

Also, I wouldn't trust an aftermarket display for that calculation. The factory PCM doesn't have that data so however Edge programmed their device is going to affect that number.
I reset my tripometer everytime I fill up. I get about 400 miles out of both tanks. I know these can be off, but with the math its about right on. When its cold i let it run for about 15 20 minutes before driving off. When its warm I start it up let it run for about 5 10 minutes then take off. I kinda ignore the edge and just do the math myself. Just was for display demonstration purposes.
 
Reply
Old Jan 22, 2025 | 10:21 AM
  #6  
cleatus12r's Avatar
cleatus12r
Butt-Head
Joined: Apr 2004
Posts: 9,453
Likes: 2,936
From: Reed Point, MT
Originally Posted by Stevenm95
When its cold i let it run for about 15 20 minutes before driving off. When its warm I start it up let it run for about 5 10 minutes then take off.
There's yer MPG problem. I let my stuff idle forever too so I'm used to it and definitely not knocking your decision.







 
Reply
Old Jan 22, 2025 | 10:46 AM
  #7  
tjc transport's Avatar
tjc transport
i ain't rite
Joined: Mar 2005
Posts: 65,548
Likes: 5,589
From: Marlboro Mental Hospital.
Club FTE Gold Member
if i just get in and drive, i get 19 mpg in my 2021 V8 F150
if i let it warm up for 10 minutes like i am doing now when it is 9 degrees in the morning, i get 13 mpg.
the 88 and 02 diesels are the same way. jump in and go as soon as it starts and i see oil pressure, they average 14-15. let them idle for 10 minutes i see 10-11
 
Reply
Old Jan 22, 2025 | 01:31 PM
  #8  
Harveyearlolstad's Avatar
Harveyearlolstad
More Turbo
5 Year Member
Liked
Loved
Community Favorite
Joined: Aug 2019
Posts: 538
Likes: 119
From: Norcal
4x4? Crew cab? D60 front axel? I have all these and I idle my truck for 5 minutes more or less. I get 14 hwy and 11ish around town. Terrible in my opinion and I was convinced something is wrong. Others get much better mileage for some reason. Whether I run a hot tune or stock setting my mileage doesn't change as long as I am easy on the accelerator.
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

Every 2026 Ford Engine Explained

 Brett Foote
story-1

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-2

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-3

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-4

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-5

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
story-6

Top 10 Ford Truck Tragedies

 Joe Kucinski
story-7

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

 Brett Foote
story-8

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

 Michael S. Palmer
story-9

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

 Verdad Gallardo
Old Jan 22, 2025 | 03:40 PM
  #9  
Stevenm95's Avatar
Stevenm95
Thread Starter
|
Mountain Pass
Liked
Loved
Community Favorite
Joined: Jun 2024
Posts: 209
Likes: 22
From: IL
Originally Posted by Harveyearlolstad
4x4? Crew cab? D60 front axel? I have all these and I idle my truck for 5 minutes more or less. I get 14 hwy and 11ish around town. Terrible in my opinion and I was convinced something is wrong. Others get much better mileage for some reason. Whether I run a hot tune or stock setting my mileage doesn't change as long as I am easy on the accelerator.
yes and yes also same I'm running fuel sipper tune and it gets the same mileage as before.
 
Reply
Old Jan 22, 2025 | 03:55 PM
  #10  
Harveyearlolstad's Avatar
Harveyearlolstad
More Turbo
5 Year Member
Liked
Loved
Community Favorite
Joined: Aug 2019
Posts: 538
Likes: 119
From: Norcal
I would try to see if you get better mileage strictly on the freeway/hwy going only 60.

10 mpg is what I get around town, maybe more like 11 mpg.
 
Reply
Old Jan 22, 2025 | 04:49 PM
  #11  
cleatus12r's Avatar
cleatus12r
Butt-Head
Joined: Apr 2004
Posts: 9,453
Likes: 2,936
From: Reed Point, MT
Originally Posted by Stevenm95
yes and yes also same I'm running fuel sipper tune and it gets the same mileage as before.

Tuning makes ZERO difference in fuel economy.

It takes a specific amount of fuel to make a specific amount of power. It takes the same amount of power to idle no matter the tuning, it takes the same amount of power to accelerate at the same rate regardless of the tuning, and it takes the same amount of power to maintain a given speed regardless of tuning.
 
Reply
Old Jan 22, 2025 | 05:50 PM
  #12  
z31freakify's Avatar
z31freakify
Hotshot
10 Year Member
Liked
Loved
Community Favorite
Joined: Dec 2012
Posts: 11,272
Likes: 1,654
From: Las Cruces New Mexico
On my 95 I let it sit at high idle for 5 minutes more or less, and MPG takes a dive in cold weather, but have warm air out the defrost and feet settings. Just a small price to pay in the colder weather for my own comfort.
 
Reply
Old Jan 22, 2025 | 07:04 PM
  #13  
Jimmy's Pilot Service's Avatar
Jimmy's Pilot Service
Laughing Gas
Veteran: Navy
5 Year Member
Photogenic
Shutterbug
Joined: Nov 2020
Posts: 994
Likes: 367
From: Republic of Texas
Finally....... @cleatus12r. for the win..

I just can not seem to get many to understand that fact.
Diesel... .4 pounds per HP per hour
Gas...... .45 pounds per HP per hour
 
Reply
Old Jan 22, 2025 | 07:10 PM
  #14  
Harveyearlolstad's Avatar
Harveyearlolstad
More Turbo
5 Year Member
Liked
Loved
Community Favorite
Joined: Aug 2019
Posts: 538
Likes: 119
From: Norcal
Can u explain this a little, not getting it.
 
Reply
Old Jan 22, 2025 | 08:39 PM
  #15  
1994F2507.3L's Avatar
1994F2507.3L
Cargo Master
15 Year Member
Liked
Loved
Community Favorite
Joined: Mar 2010
Posts: 2,227
Likes: 149
From: Higginsville, MO
Fuels not the same as it once was either….

Mines a 97 CCLB w/ E4OD 4x4 on 4.10s… I swear I used to get 16-18 MPG with it back in 2013-14, before I tore it apart for the rebuild last fall it wasn’t much over 11-13.

now that engine was tired, so I know that plays a big part, but I’ve had other folks say the same thing… fuel mileage has gotten worse over time with their older trucks. That’s gotta be partly due to aging of the trucks but I wouldn’t be surprised to learn that the fuel has been modified to meet some emissions rule either.
 
Reply



All times are GMT -5. The time now is 03:52 PM.

story-0
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-1
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-2
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-3
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-4
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-5
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-6
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-7
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-8
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-9
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE