If anyone cares heres my 2000 7.3 4x2 MPG - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 05-19-2012, 12:38 AM Thread Starter
PSN Newb
 
Join Date: Apr 2012
Posts: 40
If anyone cares heres my 2000 7.3 4x2 MPG

Before I bought my 2000 F250 4x2 Supercab LB PSD I did some searching trying to find similar pickups and what their respective MPG may be. Found a few posts but nothing was ever consistent. Also found a lot of "Yeah my 02' CC LB 4x4 with 37's gets 25 MPG!!" Seemed like a load of crap. When I bought the pickup it had 285/75/16's on it. They were Maxxis Bighorn M/T in the rear and Toyo Open County A/T's in the front. I do a 50/50 split of highway and city in hilly terrain. I checked the speedometer against a GPS and was always 1mph faster than the speedo. So using a correction factor of 1.02 ( wont waste time explaining how I figure that buts its close and doesn't change much anyway) I was getting between 14.4 and 14.8 over the course of about ten tanks. NOW I have changed the tires to 265/75/16 Open Country HT tires which are smaller and the mpg range has been 15.5-15.8, with the GPS and speedo in sync. So I saw a solid 1 mpg gain by switching to smaller less aggressive tires. I personally like it better, not just for the mpg gain, but I notice it doesn't down shift as much going up hill and seems to drive a little smoother not lugging those 285s which I dont need on a 4x2 highway hauler. Anyway, thought Id share an honest take on some MPG info.
beel is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 05-20-2012, 04:04 AM
MPG Moderator
 
Dave Whitmer's Avatar
 
Join Date: Jul 2007
Posts: 1,076
Re: If anyone cares heres my 2000 7.3 4x2 MPG

Better MPG with OEM-size rubber is what almost everybody finds.

15 sounds a bit low for a 4x2. My truck (unmodified) got 18. Of course its a stick.

Read the stickies. You might find a nugget that will help.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
Rugged Air Dam
315,000 miles
Dave Whitmer is offline  
post #3 of 10 (permalink) Old 05-20-2012, 11:13 PM
PSN Local
 
SD26's Avatar
 
Join Date: Jul 2008
Posts: 205
Re: If anyone cares heres my 2000 7.3 4x2 MPG

Quote:
Originally Posted by Dave Whitmer View Post
Better MPG with OEM-size rubber is what almost everybody finds.
Oh, agreed! Picked up another Jetta. Came with a set of snow tires in the oem size...and summer wheels which were wider than stock and 3 inches larger in diameter than stock. Tire circumference was the same, but it decreased my mpg.

On the other side, I put taller tires on my bus to maintain an rpm and gain mph. The result was less mpg.

Dave
2005 E350 6.0PSD
2003 Excursion Limited 4WD 7.3PSD - Sold
1996 E350SD dually 7.3PSD - Gone!

2002 VW Jetta TDI - stock
2007 Escape Hybrid
1999 Kaw KLR650 - 17/42 gearing
SD26 is offline  
 
post #4 of 10 (permalink) Old 05-21-2012, 09:39 AM
PSN Newb
 
Join Date: Jan 2012
Location: Eastern, KY
Posts: 22
Re: If anyone cares heres my 2000 7.3 4x2 MPG

Quote:
Originally Posted by beel View Post
Before I bought my 2000 F250 4x2 Supercab LB PSD I did some searching trying to find similar pickups and what their respective MPG may be. Found a few posts but nothing was ever consistent. Also found a lot of "Yeah my 02' CC LB 4x4 with 37's gets 25 MPG!!" Seemed like a load of crap. When I bought the pickup it had 285/75/16's on it. They were Maxxis Bighorn M/T in the rear and Toyo Open County A/T's in the front. I do a 50/50 split of highway and city in hilly terrain. I checked the speedometer against a GPS and was always 1mph faster than the speedo. So using a correction factor of 1.02 ( wont waste time explaining how I figure that buts its close and doesn't change much anyway) I was getting between 14.4 and 14.8 over the course of about ten tanks. NOW I have changed the tires to 265/75/16 Open Country HT tires which are smaller and the mpg range has been 15.5-15.8, with the GPS and speedo in sync. So I saw a solid 1 mpg gain by switching to smaller less aggressive tires. I personally like it better, not just for the mpg gain, but I notice it doesn't down shift as much going up hill and seems to drive a little smoother not lugging those 285s which I dont need on a 4x2 highway hauler. Anyway, thought Id share an honest take on some MPG info.
Congrats on the new found MPGs. However some of that mileage was probably already their, you just could not see it because your speedo was off. Your correction factor for your old tires should have been 1.037. I only know this because I run the 285/75R16 on my truck and using a speedo calculator I found my speedo was off 3.7%. So lets see how this changes your out come:

Lets say you drove your truck on your old tires 400 miles. You add in the correction factor you were using 400 x 1.02 = 408 miles. Lets say it took you 28 gal. to fill up. 408 miles / 28 gal = 14.57 mpg.

Lets try the same calculation using the 1.037 factor. We'll use the same odometer reading of 400 miles and the same 28 gal. of fuel. 400 x 1.037 = 414.8 miles. So... 414.8 miles / 28 gal. = 14.81 mpg.

So the difference for this example is 0.24 mpg. I am not trying to be a dick, you got a great increase out of swapping your tires to a stock size. I just feel as you do in the fact many people report crazy MPG #s all the time. Some times high, some times low. Lots of people swap tires and think WOW I just lost 2 MPGs, when in reality they forgot to compensate for the speedo being off.
blue72 is offline  
post #5 of 10 (permalink) Old 05-22-2012, 04:28 AM
PSN Local
 
SD26's Avatar
 
Join Date: Jul 2008
Posts: 205
Re: If anyone cares heres my 2000 7.3 4x2 MPG

I think beel could share his methodology. Sounds like he thought it through.

Personally, I never use the rote concept of "tire size" as the actual circumference can be found for a particular tire. Even the same "sized" tire can be different within a nanufacturer's line up.

Dave
2005 E350 6.0PSD
2003 Excursion Limited 4WD 7.3PSD - Sold
1996 E350SD dually 7.3PSD - Gone!

2002 VW Jetta TDI - stock
2007 Escape Hybrid
1999 Kaw KLR650 - 17/42 gearing
SD26 is offline  
post #6 of 10 (permalink) Old 05-22-2012, 07:09 PM
1 Slo PoMoFo
 
Ranger50's Avatar
 
Join Date: Aug 2010
Location: EKY
Posts: 109
Re: If anyone cares heres my 2000 7.3 4x2 MPG

Reading this makes my 97 look like a much better buy all those years ago... I got 18mpg all day, every day, city, freeway didn't matter. Just a plain jane bone stock XLT SC LB 4x2 auto.
Ranger50 is offline  
post #7 of 10 (permalink) Old 05-31-2012, 02:39 PM Thread Starter
PSN Newb
 
Join Date: Apr 2012
Posts: 40
Re: If anyone cares heres my 2000 7.3 4x2 MPG

Quote:
Originally Posted by Dave Whitmer View Post
Better MPG with OEM-size rubber is what almost everybody finds.

15 sounds a bit low for a 4x2. My truck (unmodified) got 18. Of course its a stick.

Read the stickies. You might find a nugget that will help.
Yeah lately it has been around 15.5 mpg mixed. I think some things that may attribute to this is the fact I have the automatic transmission and I live in mountain terrain in Washington. I am constantly going up and down hill all day. I am moving back to Florida this summer, so Im hoping to see a noticeable difference in the flat terrain.
beel is offline  
post #8 of 10 (permalink) Old 06-09-2012, 09:08 AM
PSN Local
 
blacksmoke.r.us's Avatar
 
Join Date: Mar 2010
Posts: 147
Re: If anyone cares heres my 2000 7.3 4x2 MPG

Quote:
Originally Posted by beel View Post
I am moving back to Florida this summer, so Im hoping to see a noticeable difference in the flat terrain.
Better fuel milage may also be attributed to the lower elevation

08 F250 CCLB 4X4 Mini Maxx with Gearhead tunes.

01 F250 CC SB 4X4 DP-F5 AFE stage 2 38R WW CFM Intake Sparco Intercooler FFD 160cc/100% SRP 1.1 BTS Trans 6.0 31 row cooler Swamps IDM AirDog II FRx Beans sump 5" Straight Exhaust with 6" Turndown SOLD

92 Mustang GT 331ci Forged Stroker Cobra T5 Intercooled Procharger (8psi) 467rwhp SOLD!
blacksmoke.r.us is offline  
post #9 of 10 (permalink) Old 08-07-2012, 09:37 AM
PSN Local
 
capt dong's Avatar
 
Join Date: Jul 2011
Location: Houston, TX
Posts: 82
Re: If anyone cares heres my 2000 7.3 4x2 MPG

isnt florida humid?

08 Job 3 KR CC SB 3.73
Mini Maxx 300HD
Flo Pro 5" DP-back
Diesel Site Coolant Filter
S & B CAI
Flo Pro EGR Delete with Intake Elbow
Flo Pro CAC Pipe
Flo Pro 4" Downpipe with DEI Ti Wrap
Cat EC1
Diesel Site Trans Filter
capt dong is offline  
post #10 of 10 (permalink) Old 08-07-2012, 03:47 PM
MPG Moderator
 
Dave Whitmer's Avatar
 
Join Date: Jul 2007
Posts: 1,076
Re: If anyone cares heres my 2000 7.3 4x2 MPG

Warm humid air is lighter than cold, dry air. See your psychrometric charts.

Aero drag is proportional to air density.

Florida, with low-density air and dead-flat terrain should be excellent MPG country.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
Rugged Air Dam
315,000 miles
Dave Whitmer is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the PowerStrokeNation : 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:
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