Fuel avg on Highway - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by snopro99, this thread has received 22 replies and been viewed 2240 times.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 23 (permalink) Old 04-14-2007, 04:03 PM Thread Starter
 
Join Date: Nov 2006
Posts: 277
Points: 2,646
Thanks: 0
Thanked 0 Times in 0 Posts
Fuel avg on Highway

I got on the highway reset the avg. gauge and drove for 335 miles down I-70 at 1900 rpm's wich put me at 70 to 73 mph and the avg gauge read 21.2 to 20.8 depending on hills and what not.I would go with a avg of 19.5 to be safe since I didn't add a certain amount of fuel and drive and then refuel and do the math to excat science.But with the math I did I came up 18.5 and that includes some in town drivining which kills any fuel milage.
On the way home I ran 80mph and my avg dropped down to 15.7 to 16.1 -what a differnce. Also my truck only has 2700 miles on it and its not even close to be broken in so I would expect it to get better when it gets broke in.

My point to this whole story is that to get mileage we need to change our driving style and keep or foot out of it or get crappy mileage.Also most tests done for fuel avg. are done at 55mph, so all those people that think they are getting 30 plus in cars arn't when they drive 75 to 85mph like they due on the Interstates.
snopro99 is offline  
Sponsored Links
Advertisement
 
post #2 of 23 (permalink) Old 04-14-2007, 05:20 PM
Super Moderator
 
John_G's Avatar
 
Join Date: Dec 2008
Location: Tyler, TX
Posts: 4,247
Points: 74,701
Thanks: 101
Thanked 407 Times in 347 Posts
Yes, speed plays a HUGE role in MPG.

The formula for aero drag is: 0.5 x (frontal area) x V^2

Or 1/2 the frontal area times the velocity squared. So if you increase from 55 mph to 70 mph the drag increases 62%, and from 70 to 80 MPH it increases another 31%. The total drag increase from 55 to 80 is 111%!!

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin

I vote for LIBERTY!
John_G is offline  
post #3 of 23 (permalink) Old 04-14-2007, 06:44 PM
 
HARLEY6LF250SDU's Avatar
 
Join Date: Dec 2008
Location: St Louis, MO
Posts: 1,148
Points: 47,144
Thanks: 190
Thanked 214 Times in 129 Posts
Images: 6
I pulled a 4200-lb empty car hauler 950 miles with a New 08, (accross CO-KS-MO) and avg MPG was 14.7 at 70 mph.
randy

Ford Fleet/Comm Truck Mngr. Custom F-650 Trucks, Shelby GT500 & KR Mustangs. 406 544-6891 [email protected] Thanks Randy
TDG Mafia #53 ... Riding High Club #30 https://www.thedieselgarage.com/foru...pictureid=1589
I'd rather be riding my motorcycle thinking about God, than in church thinking about my motorcycle. ~unknown~
===============
"I wanna die like my grandfather, in his sleep, not like the other 4 passengers screaming in his car".
===============
2008 Harley Softail Custom 105th Aniv Limited Edition
2006 Harley F-250 Black w/Blue Flames FOR SALE $23K
2006 Harley F-350 Tor Red w/Black Flames SOLD
2005 Harley F-250 True Blue w/Med Blue Flames SOLD
2004 Harley F-250 Black & DSG 2/tone 6" Lift SOLD
1.3 million miles OTR and still Truckin!!
If you can read this, thank a teacher. If it's in English, thank a soldier.
HARLEY6LF250SDU is offline  
post #4 of 23 (permalink) Old 04-15-2007, 12:20 AM
 
Join Date: Nov 2006
Posts: 254
Points: 1,806
Thanks: 0
Thanked 0 Times in 0 Posts
my thoughts exactly!
imported_QUICK83 is offline  
post #5 of 23 (permalink) Old 04-16-2007, 01:15 AM
 
Join Date: Apr 2007
Posts: 6
Points: 134
Thanks: 0
Thanked 0 Times in 0 Posts
It appears that I may have a fuel mileage problem. I have 1400 miles and average fuel mileage is 9.4 mpg. Is this normal?
smokefree is offline  
post #6 of 23 (permalink) Old 04-16-2007, 01:27 AM
Mafia member #6
 
Rutcutter's Avatar
 
Join Date: Dec 2008
Location: Arkansas
Posts: 1,714
Points: 48,581
Thanks: 176
Thanked 95 Times in 52 Posts
Garage
Mine is about the same as everyone else's, anywhere from 13-18 depending on speed...

2011 SD F350 6.7L
White Platinum Tri Coat
Lariat Ultimate Pkg.
GenII Warn winch mount
Autospring 2" Leveling Kit
35/12.50/20 Toyo M/T's
Dually rear center light
6K HID Headlights/fogs

2008 SD CC 6.4L 4x4 (SOLD)
2010 Camo Outlander 800XT DPS
Rollin' on 30" zilla's

http://community.webshots.com/user/h...host=community
Rutcutter is offline  
post #7 of 23 (permalink) Old 04-16-2007, 01:34 PM
 
Join Date: Nov 2006
Posts: 254
Points: 1,806
Thanks: 0
Thanked 0 Times in 0 Posts
your milage will be directly affected by how hard you drive and if u tow etc not only cause you are using more fuel but u will go into regen alot more and it uses one heck of alot of fuel when regenerating!!! i did an experiment and did a reset at 55 mph on flat road with out regen on(u can tell cause it will idle up in neutral or park when in regen mode) the mpg showed [email protected] mph NO regen. Then when the regen was on i did the same speed and reset mileage minder and says 9-10 mpg and will not go up at all till regen complets and goes off.just my obsevations and opinion, not saying i know im absolutly correct here. I was getting 18.4 average with out reset untill regen.
imported_QUICK83 is offline  
post #8 of 23 (permalink) Old 04-16-2007, 09:28 PM
 
Join Date: Jun 2006
Posts: 294
Points: 2,117
Thanks: 0
Thanked 0 Times in 0 Posts
How often (on average) are you regenning? (new verb!) GMC is saying about every 200 miles for medium duty. If you are averaging 50 mph and it takes 30 minutes to regen, you are regenning (there it is again!) about 10% of your driving time.
sacgmc is offline  
post #9 of 23 (permalink) Old 04-16-2007, 10:45 PM
Mafia member #6
 
Rutcutter's Avatar
 
Join Date: Dec 2008
Location: Arkansas
Posts: 1,714
Points: 48,581
Thanks: 176
Thanked 95 Times in 52 Posts
Garage
Mine was regenning almost every 200 miles but this time it has gone over 300and still no regen,im keeping a log on when it happens...

2011 SD F350 6.7L
White Platinum Tri Coat
Lariat Ultimate Pkg.
GenII Warn winch mount
Autospring 2" Leveling Kit
35/12.50/20 Toyo M/T's
Dually rear center light
6K HID Headlights/fogs

2008 SD CC 6.4L 4x4 (SOLD)
2010 Camo Outlander 800XT DPS
Rollin' on 30" zilla's

http://community.webshots.com/user/h...host=community
Rutcutter is offline  
post #10 of 23 (permalink) Old 04-16-2007, 11:00 PM
 
Join Date: Nov 2006
Posts: 254
Points: 1,806
Thanks: 0
Thanked 0 Times in 0 Posts
mine did 3 times so far. 1st time was at about 350 miles, 2nd at about 570, 3dr time was at 900 miles and it has 1000 now.
imported_QUICK83 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Truck Forum - TheDieselGarage.com 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










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