Fuel economy with a regearing? - Ford Powerstroke Diesel Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 3 Old 01-21-2008, 10:58 AM Thread Starter
Serving Our Country!
 
scraph's Avatar
 
Join Date: Nov 2007
Location: Hernando, FL
Posts: 200
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Arrow Fuel economy with a regearing?

I have a 2000 F-250 with the 6-speed manual transmission. In city driving I get just over 19mpg (this is with continuous stop-and-go and playing around with the turbo somewhat). In highway driving (~70-75mph) I only manage to get 16mpg.

I have 3.73 gears and stock size tires (265/75R16) and at 75mph my engine is turning 2200rpm. I imagine the reason for my poorer highway economy has to be due to this higher sustained RPM and therefore due to the 3.73 gears.

I do use the truck for some towing, however, the largest load it will ever see for the forseeable future is a 4000lb 20' boat. I imagine I would still have plenty of pulling power available for such a light load if I regear.

Does anyone have any recommendations as far as new gear ratio in consideration of pulling the boat, maintaining good fuel economy in the city (should only improve/maintain with higher gears), and improving it on the highway.

Thanks.
scraph is offline  
Sponsored Links
Advertisement
 
post #2 of 3 Old 01-21-2008, 11:26 AM
Compression Ignition Addict
 
mrnecsteve's Avatar
 
Join Date: Apr 2007
Location: North East,Md.
Posts: 1,594
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I have no personal experience with these ....but your truck could be a candidate for one of these:
http://www.forddoctorsdts.com/articl...icle-05-01.php
Overdrive for Ford E4OD & 4R100 4 speed automatics Save Money!
When they offer one suitable for the f250 6.0 with transfer case ,i intend on getting one or the other.
If you do a "payoff analysys" dont be short sighted...you can do the install with the thought of taking it with you to your next truck ,years down the road. or reselling it with your truck at a markup. (Keep your original parts AND modify a junk yard driveshaft that you recondition)\
I dont have personal experience with your engine. I am certain that mileage drops off
big time ,when i cross over the sweet spot of 2000 rpm on my 6.0. Hopefully others will chime in what there experience has been with your model engine.
mrnecsteve is offline  
post #3 of 3 Old 01-21-2008, 12:49 PM
Compression Ignition Addict
 
sirnunya's Avatar
 
Join Date: Jan 2007
Location: Springfield, OR
Posts: 738
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
under 2000rpms is where you'll wanna be. If you have a 4x4 I think the only other option is 3.54 gears, if you are only 2wd you could go down to 3.08's. There is a guy on here with 3.08's, but he has a single cab 2wd with some fairings and whatnot to achieve max mpg. Paying someone else to change the gears is not cheap either, so I would look into that. Another way to drop the RPMs would be to put on bigger tires. But that would increase rolling resistance and city mileage will go down but highway should go up. If you're only 2wd I would do it, but changing out two is $$$$. Maybe I'm just cheap
sirnunya is offline  
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:
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









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
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