Diesel mileage - Page 2 - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 06-09-2006, 11:25 AM   #11
Supporting Member
 
lovemysan's Avatar
 
Join Date: Jun 2006
Posts: 595
Country: United States
I can get 22-24 mpg on the highway at 65mph or less. I have a 95 f 250 psd, auto, 4.10s. Your city mileage sounds really good to me. I've always thought that less turbo spool meant more mileage. After all a turbo is a restriction and spooling is causing backpressure. But you don't want to lug a turbo diesel you'll make more heat and burn more fuel. My 91 dodge cummins seemed to like no boost at highway speeds better. I swapped to a smaller turbine housing and lost a maybe 1 mpg. At 65 it would hover between 5-7lbs of boost with the small housing verses no boost with stock.

Do you think possibly you were dealing with a headwind on that long trip?
Your right about the people on the diesel truck forums. Its all about what 150hp chip your running. Have you thought about a chip or programmer for mileage. If you bump the timing a little it helps mileage. I'd also run a straight pipe or a donaldson muffler(a BIG one). Maybe an intake too. Thats about it for mileage.
__________________

__________________
02 Saturn SL
5 speed
for pics click the link below

http://s75.photobucket.com/albums/i3...emysan/saturn/

[SIGPIC][/SIGPIC]
"for best mileage swap in a d15z1"
lovemysan is offline   Reply With Quote
Old 06-09-2006, 12:57 PM   #12
Registered Member
 
Join Date: Oct 2005
Posts: 682
Country: United States
That trip to Maine was mostly with a stiff tailwind, a tonneau, and I drafted semis for a while.

My F350 is a 6.0 with 3.73 gears. It ought to get better mileage than a 7.3 with 4.10 gears, wouldn't you think?

I thought about buying a chip, but the 6.0 has a lousy reliability record. Mine has already has had 2 warranty repairs. I don't want to void my 100,000 mile warranty. So, I'm basically screwed.
__________________

__________________
Capitalism: The cream rises. Socialism: The scum rises.
Sludgy is offline   Reply With Quote
Old 06-09-2006, 03:58 PM   #13
Supporting Member
 
lovemysan's Avatar
 
Join Date: Jun 2006
Posts: 595
Country: United States
Quote:
Originally Posted by Sludgy
That trip to Maine was mostly with a stiff tailwind, a tonneau, and I drafted semis for a while.

My F350 is a 6.0 with 3.73 gears. It ought to get better mileage than a 7.3 with 4.10 gears, wouldn't you think?

I thought about buying a chip, but the 6.0 has a lousy reliability record. Mine has already has had 2 warranty repairs. I don't want to void my 100,000 mile warranty. So, I'm basically screwed.
I drove very gently to get 23.9 mpg. The truck is a 2wd. Temps outside were mid 60s with low humidity. That was full to the top of the filler neck. The truck might be 3.73 gears. 80 mph is 2750 rpms.

Thats why I loved my old cummins so much. Its hard to beat mechanical injection. But alas, a friend put gas in it and the I-pump went down, so now I drive a saturn. Kinda sad to me, really.
__________________
02 Saturn SL
5 speed
for pics click the link below

http://s75.photobucket.com/albums/i3...emysan/saturn/

[SIGPIC][/SIGPIC]
"for best mileage swap in a d15z1"
lovemysan is offline   Reply With Quote
Old 06-09-2006, 08:42 PM   #14
FE nut
 
diamondlarry's Avatar
 
Join Date: Sep 2005
Posts: 1,020
Country: United States
Quote:
Originally Posted by lovemysan
I drove very gently to get 23.9 mpg. The truck is a 2wd. Temps outside were mid 60s with low humidity. That was full to the top of the filler neck. The truck might be 3.73 gears. 80 mph is 2750 rpms.

Thats why I loved my old cummins so much. Its hard to beat mechanical injection. But alas, a friend put gas in it and the I-pump went down, so now I drive a saturn. Kinda sad to me, really.
Welcome to the forum. It's about time we start getting some more Saturns.
__________________
Horsepower is how hard you hit the wall, torque is how much of the wall you take with you.

2007 Prius,



Team Slow Burn
diamondlarry is offline   Reply With Quote
Old 06-11-2006, 07:29 AM   #15
Registered Member
 
Join Date: Oct 2005
Posts: 682
Country: United States
I finally got around to some basic F350 6.0 diesel mileage tests with the Scangage. All tests were at about 60F around the same 12 mile round trip.

Speed ------- Bed conditions-------- Mileage
50 Tonneau 24.9
70 Tonneau 17.2
60 Tonneau 21.6
60 Tailgate down 22.0
60 Tailgate up 21.6

I guess my earlier theory that diesel mileage might get better at some turbo "sweet spot" isnt' valid.

And the tonneau cover didn't do anything for mileage. The tailgate down may have helped, but the difference is too small to say anything definite.
__________________

__________________
Capitalism: The cream rises. Socialism: The scum rises.
Sludgy is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Kia Soul mileage is terrible MissDee General Fuel Topics 34 02-15-2015 03:04 AM
anyone got a tire pressure vs fuel economy graph? MetroMPG General Fuel Topics 4 08-10-2009 07:53 PM
Recent Fuel-ups Graph Scale rcsheets Fuelly Web Support and Community News 5 09-08-2008 04:11 AM
All Licensed Drivers terrapin Fuelly Web Support and Community News 0 08-07-2008 10:49 AM
"active" aero grille slats on 06 civic concept MetroMPG General Fuel Topics 21 01-03-2006 01:02 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 06:07 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.