2002 F-250 30+mpg?! - Diesel Forum - TheDieselStop.com
General Diesel Discussion about diesels in general. All brands are welcome, please refrain from brand wars. Discussions about types of diesel fuel also go here.

 
LinkBack Thread Tools Display Modes
post #1 of 15 (permalink) Old 05-08-2008, 05:38 PM Thread Starter
Senior Member
 
greenskeeper79's Avatar
 
Join Date: Oct 2002
Location: PA
Posts: 1,436
My Photos: (0)
Feedback Score: 0 reviews
2002 F-250 30+mpg?!

Over at TDIclub.com where I go for our other vehicle, a guy is trying to claim that a 2002 F-250 can get over 30mpg on the highway...is this even possible?

Quote:
A Ford F-250 Diesel with the gearing changed to 262-1 rear end can hit 30+ mpgs on the highway . I saw this in a 2002 model that a friend has . It will not fly off the line now 0-60 mph but it still can pull almost anything and achieve 25-32 mpgUS all day long .
The whole discussion is here "Gas tax holiday" bad idea? - Page 3 - TDIClub Forums

Maybe 30mpg in gear coasting downhill?

Gunga galunga...gunga -- gunga galunga.

97 F-250 CC 4x4 7.3L PSD E4OD
99 F-250 CC 4x4 7.3L PSD ZF6 E99 CALI DELETE
ROTELLA 5W-40, MOBIL1 ATF, PENNZOIL SYNCHROMESH
greenskeeper79 is offline  
Sponsored Links
Advertisement
 
post #2 of 15 (permalink) Old 05-08-2008, 09:37 PM
Senior Member
 
lone_star_dsl's Avatar
 
Join Date: Apr 2005
Location: Monument, CO
Posts: 1,739
My Photos: (1)
Feedback Score: 0 reviews
Is a 2.62:1 gear ratio even available for these axles? I doubt that truck could pull anything.

2016 RAM 3500 Big Horn, CC LB, DRW, 6.7 CTD, 4wd, Aisin trans

Gone but not forgotten...
2002 F-350 SRW
Lariat, Crew Cab, Long Bed
4X4, Auto Trans, Tymar Intake
Wicked Wheel, Zoodad Mod
DP Tuner - 60E, 80E, 40T, 80T, Decel
05+ Harley Headlights
6" Upper and Lower Windshield Brows
ISSPRO Gauges, Edge Insight CTS

Sold at 206,000 miles
lone_star_dsl is offline  
post #3 of 15 (permalink) Old 05-09-2008, 12:45 AM
Senior Member
 
Join Date: Jun 2001
Location: US
Posts: 1,291
My Photos: (18)
Feedback Score: 0 reviews
Wow. Nice to know, but waist of a 'truck'.

Heck, might as well swap out that old 351M in my dad's old Mercury Montego and put in a 6.9L IDI. It has a 3.00:1 axle.

1999 E-350 Cub Wagon, 7.3L Power Stroke, E4OD, 3.55
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1990 E-350 Club Wagon, 7.3L IDI, E4OD, 3.54LS
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
x2
1994 Chevy C2500 6.5L TD, 3.42
1983 F-150 2x4, 4.9L, C-6 w/GV-OD, 3.55 Farm pickup
1981 C-8000, 3208 CAT, RT-6510, Rockwell SSHD Tandems (Swap)
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 VW Rabbit Pickup 1.6L diesel (project)
1978 VW Rabbit 1.5L diesel (project)
1977 K100C, NTC-350, RT-1110, Tandem
1977 Transtar II, NTC-290, RT-9509 Single
1977 Transtar II, Formula 290, RT0-9513, Tandem (project)
1974 C-750, 391CID, Clark 5 speed, Eaton 2 speed
Kaliburz is offline  
Sponsored Links
Advertisement
 
post #4 of 15 (permalink) Old 05-09-2008, 06:51 AM
Senior Member
 
Join Date: Jan 2003
Location: Florida
Posts: 12,942
My Photos: (0)
Feedback Score: 0 reviews
BS

Quote:
Originally Posted by greenskeeper79 View Post
Over at TDIclub.com where I go for our other vehicle, a guy is trying to claim that a 2002 F-250 can get over 30mpg on the highway...is this even possible?



The whole discussion is here "Gas tax holiday" bad idea? - Page 3 - TDIClub Forums

Maybe 30mpg in gear coasting downhill?
I had a 98.5 Dodge/Cummins with Gear Vendors and it could do 20-21 highway at 65-70 and that is pretty darn good. 30 plus is a pile of poop!

Too much junk/toys to mention, ever changing due to too getting bored too quickly. I need a 10 step program!
Want to call? I'm in the book. Want to argue....First explain the square root of negative one....lol
roofeditor is offline  
post #5 of 15 (permalink) Old 05-09-2008, 10:44 AM
Senior Member
 
Join Date: Nov 2000
Location: Madison, Wisconsin
Posts: 3,533
My Photos: (0)
Feedback Score: 0 reviews
I would say it "MAY" be possible but it depends on lots of variables. If it's a reg. cab 2WD 5-speed or 6-speed manual cruising about 30-40 mph with a bed cover or topper with a tailwind then it's possible. But if it's a 4-door 4WD with A/T He better have a REALLY strong tail wind!

Denny
'96 F-250 Reg. Cab 4X4 5-sp POWERSTROKE
298,500 mi & NO Problems, LUK Clutch
Dr.Evil is offline  
post #6 of 15 (permalink) Old 05-09-2008, 01:17 PM
Senior Member
 
drcampbell's Avatar
 
Join Date: Aug 2004
Location: The Motor City, Michigan
Posts: 3,778
My Photos: (32)
Feedback Score: 0 reviews
It's completely possible.

First, notice that he's claiming 28 average mi/gal. Second, notice that there's no mention of his driving style, location or the weather. (Warmer air = lower air density = less aerodynamic drag. So does higher altitude)

In 1986, it was possible to buy an F-150 that tested out at 20/25 mi/gal. That was with a 5.9-liter gas engine and a 4-speed, neither of which were really designed or calibrated for fuel economy. (if fuel economy was your priority, they offered the Ranger and the Courier)

An F-250 is about the same size and has about the same drag as an F-150. With higher-pressure, lower-rolling-resistance tires, conservative driving and the low final-drive reduction ratio, it's not terribly surprising.


Have you ever noticed that an 18-wheel Class 8 tractor-trailer is ten times the weight and has five times the frontal area of an F-250, but consumes only 2.5 times as much fuel?


Start with a final drive ratio that results in the engine turning 1500 rev/min or less at the posted speed limit. Ditch the overdrive; that adds a pair or two of gear teeth in mesh and will cost you 4%. Ditch the notion of 300+ Hp and install something much more reasonable. (ever notice that 80,000 pound semis have about the same horsepower as a Superduty?) To restore the pulling power lost, add two more gear ratios below what's now called "first". Give it a reasonable amount of ground clearance and clean up the aerodynamics. Finally, keep it down to the posted speed limit. (Better yet, run the Federal Test Procedures for consistency)

30 mi/gal doesn't even sound difficult, if there's a desire to do it. Unfortunately, horsepower, not fuel economy, sells pickup trucks.

-
Douglas Campbell, P.E.

1986 Isuzu P'up, 177,673.8 miles.
- Hella headlights (highly recommended)
- DOT C-2 back end (also recommended)
- R-12 air conditioner converted to R-406a. Saved ozone and money
- 4.1:1 final drive converted to 3.4:1. Quieter, better mileage but it's a good thing I live in the flat Midwest.
- 9/22/2007, age 21: Still running well when reluctantly sent away for reincarnation, due to body & frame rust.
- Never did get around to converting it to french-fry oil, which is why I originally stumbled upon this site.
drcampbell is offline  
post #7 of 15 (permalink) Old 05-09-2008, 09:54 PM
Senior Member
 
Seafarer12's Avatar
 
Join Date: Jan 2005
Location: Austin, TX
Posts: 2,581
My Photos: (0)
Feedback Score: 0 reviews
I think it would be possible but it would take more than 2.62 gears. I mean I have seen guys with 4wd new cummins with only a programmer getting 22 mpg and the guy that rebuilt my tranny got mid 20's out of a std output cummins doing 65mph. The problem is all these guy that blast down the highway doing 80 then complain that they only get 16 mpg.

Massey 65
Seafarer12 is offline  
post #8 of 15 (permalink) Old 05-11-2008, 08:49 PM
 
Join Date: Apr 1999
Posts: 3,250
My Photos: (0)
Feedback Score: 0 reviews
Like drcampbell, I think 30 MPG is entirely possible.

3.08s were very powerful for me. 2.63s would be much better.

I think some aero mods are a necessity.

2.63s imply they are not using the 10.25 or 10.5 axles most Super Duties come with or they have source of custom-hobbed gears.
Dave Whitmer is offline  
post #9 of 15 (permalink) Old 02-16-2017, 06:01 AM
Junior Member
 
Join Date: Feb 2017
Posts: 1
My Photos: (0)
Feedback Score: 0 reviews
I WOULD NEVER BELEAVE IT UNLES I GOT 30M.P.G. also!!! 4X4 35s, 20 Harley rims , early 1999, 4 inch pipe, Edge CS programmer, 150,000 miles on the clock, extended cab, Louvered tailgate, louvered headache rack, and I run the soy deasil with that new Archoil in the fuel and the oil. Its got a big trans cooler on it and the banks intake. Its got the small turbo from early 1999 and it dose not smoke a little bit. This is also going 65 on a round interstate 100 mile trip. I don't believe it myself? The suspension is all stock except for Billsteins. IT HAS ALWAYS HAD ROTILLA IN IT. All I know is I got the truck and it wouldn't get 20. I got the chip and only ran iy on towing. Still 14 city 16 highway going 50. I put the airbag, upped the tune to the extreme, started running Archoil, put the levered bull rack on it and started running the tire pressure at 75/80 psi. All the sudden I saw 30 ampg? Didn't believe it even though the edge had the tires programed in. Still couldn't believe it. Got my gps put on it, filled the tank till I could see it in the fill tube. Then went for a 103 mile run. Pulled back in the same station and couldn't get but a very little over 3 gallons in the tank and spilled some down the side of the truck. I still don't get it? Say I am full of brown ozy dodo . I would say that if I heard someone clamming this. Only other thing I did to the truck was change the rear oil and added some Lucas, which shouldn't help should cause drag. Still I got 30 mpg at 65 mph on a round trip. Smaller turbo, smaller injectors because of it being early 1999? I think you guys need to try that snake oil Archoil. Can't say 100 what mad the change or if it was a little of everything. I STILL DON'T BELEAVE IT AND I PROVED IT TO MYSELF. Someone tell me how I could of messed up the math? I just don't know. Seems everyone else's truck smokes but mine with the 7.3. Mine used to smoke before the changes not bad but could see it now and then. Now it never smokes even at start up in the cold, I do plug it in though. Please tell my why I am wrong. It just makes no sense to me. Back around town it still only gets 14 -16 on short under 5 mile trips.
Big Brick is offline  
post #10 of 15 (permalink) Old 10-06-2019, 04:50 PM
Senior Member
 
Join Date: Jan 2010
Posts: 153
My Photos: (0)
Feedback Score: 0 reviews
What was the ambient temperature when this occured. If you have a return, which I believe 2002 does, the engine can heat the fuel up expanding it in the tank. If you let fuel cool back to ambient temperature before you fill you may get another number. Especially since your only talking 3 gallons
Terry in Md is offline  
post #11 of 15 (permalink) Old 10-06-2019, 05:25 PM
Senior Member
 
badbart's Avatar
 
Join Date: Nov 2008
Location: In your dreams
Posts: 1,010
My Photos: (0)
Feedback Score: 0 reviews
While I'm skeptical, my 7000 pound plus 97 F350 Crew Cab Dually got 20.7 at 55 mph. So I'm sure it's possible. Now, can we/do we drive in such a manner in every day life? Probably not.

That said, I drive a 2018 Freightliner Cascadia. Fuel economy in these class 8 trucks has improved by 35% in the last 5 years. These trucks would typically get 5-6 mpg, empty or loaded. With the software and improvements along with auto shift 12 speed transmission, this 455 hp, 1750 ft/lb beast gets between 8.5 and 10 mpg. And it's funny, many people don't want a diesel citing maintenance cost. This 900 cubic inch Detroit Diesel goes 75K (yes, thousand) miles between oil changes. The cost is around $460 for all filters (air also) and 11 gallons of Delo. So, diesel technology is still improving folks. And I'm about to roll over 300K miles this week. We typically roll about 5000 miles a week.

2011 F350 4x4 XL Crew Cab Dually

2010 Keystone Fuzion 405 Toyhauler

Last edited by badbart; 10-06-2019 at 05:36 PM.
badbart is offline  
post #12 of 15 (permalink) Old 10-06-2019, 05:43 PM
Senior Member
 
Join Date: Apr 1999
Location: Chugiak Alaska
Posts: 4,597
My Photos: (8)
Feedback Score: 0 reviews
If anyone wants to know about real MPG with a super duty all they have to do is go back and look at the work Dave Whitmer has done!!! Most all the other high MPG posts seem to be smoke and mirrors or just plan BS. Not really ready to put much faith in a one post wonder. Put a load like a 12,000 lb 5th wheel on a F250/350 and you will be down to 10-12 mpg. Soooo can it be done, yes. BUT!!!! It would be a very custom rig and not a 4x4 crew cab tow monster. Dave could you get the gearing using an overdrive unit?
DENNY

Early 1999 F350 AUTO 4x4 CC LB DRW 4.10 6.0 trans cooler, Front hitch, 2,000 hubs/ brakes, Bilstein shocks/steering stabilizer, Diesel site coolant filter 203 thermostat, EBV delete, new O-rings, new Oil cooler, RIFF RAFF FRX, Glow plug led, Pillar gauges, Lighted cupholder, Painless wiring fuze block, Harpoon/hutch mods, Removed axle blocks. Air bags, 5 wheel hitch, In bed 7 pin plug. Spare tire key delete. KLHANSEN on speed dial. 75,000 as of May 2019
DENNY is online now  
post #13 of 15 (permalink) Old 10-06-2019, 09:31 PM
Senior Member
 
badbart's Avatar
 
Join Date: Nov 2008
Location: In your dreams
Posts: 1,010
My Photos: (0)
Feedback Score: 0 reviews
Quote:
Originally Posted by DENNY View Post
If anyone wants to know about real MPG with a super duty all they have to do is go back and look at the work Dave Whitmer has done!!! Most all the other high MPG posts seem to be smoke and mirrors or just plan BS. Not really ready to put much faith in a one post wonder. Put a load like a 12,000 lb 5th wheel on a F250/350 and you will be down to 10-12 mpg. Soooo can it be done, yes. BUT!!!! It would be a very custom rig and not a 4x4 crew cab tow monster. Dave could you get the gearing using an overdrive unit?
DENNY
My old 97 would get 10-13 mpg towing RV's 9-13K at 62 mph. My 2011 will get 9-10 mpg at 75 towing my 17K Fusion Toy Hauler, and might I add, with no effort! I haven't checked it at slower speeds.

2011 F350 4x4 XL Crew Cab Dually

2010 Keystone Fuzion 405 Toyhauler
badbart is offline  
post #14 of 15 (permalink) Old 10-06-2019, 11:11 PM
Senior Member
 
Join Date: Apr 1999
Location: Chugiak Alaska
Posts: 4,597
My Photos: (8)
Feedback Score: 0 reviews
When I get off my lazy butt I want to try a air dam. What I really need is a gearing change just not sure how to do it. Not a big deal for me because I do not drive that much anymore, just kind of fun stuff to try.
DENNY

Early 1999 F350 AUTO 4x4 CC LB DRW 4.10 6.0 trans cooler, Front hitch, 2,000 hubs/ brakes, Bilstein shocks/steering stabilizer, Diesel site coolant filter 203 thermostat, EBV delete, new O-rings, new Oil cooler, RIFF RAFF FRX, Glow plug led, Pillar gauges, Lighted cupholder, Painless wiring fuze block, Harpoon/hutch mods, Removed axle blocks. Air bags, 5 wheel hitch, In bed 7 pin plug. Spare tire key delete. KLHANSEN on speed dial. 75,000 as of May 2019
DENNY is online now  
post #15 of 15 (permalink) Old 10-07-2019, 02:31 AM
Lifetime Supporting Member
 
ArcticDriver's Avatar
 
Join Date: Apr 2015
Location: Longmont, CO
Posts: 3,777
My Photos: (0)
Feedback Score: 0 reviews
30 mpg with a 7.3?

I think somebody’s calculator needs new batteries.

😉


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Stancor GPR. Walker BTM. Noco Mod. Michelin Defender LTX 285/75/16.

SOLD:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2000 F-250 4x4 SC SB 7.3 PSD w/4R100. 164,000 miles.
NOS Black CPS. Rebuilt Fuel bowl w/gold spring, 6.0 Cooler, Walker BTM, Stancor GPR, Michelin LTX M&S2.
ArcticDriver is online now  
Sponsored Links
Advertisement
 
Reply

  Diesel Forum - TheDieselStop.com > Other Topics > General Diesel

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Forum - TheDieselStop.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











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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