UPROKTOY says it's impossible... - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Tow rigs and trailers
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old January 13th, 2008, 05:58 PM   #1
Motor Slut
I put the Ick in Dick.
 
Motor Slut's Avatar
 
Join Date: 11-10-05
Location: 49963
Posts: 2,411
iTrader: (0)
Mentioned: 0 Post(s)
Default UPROKTOY says it's impossible...

So Chad said that 17.5mpg in an '05 CTD was high so I decided to see what would happen if I drove it like a normal person.

I reset the meter and went on a 153 mile journey with a 500# snowmobile in the back for half the trip.

Here's the results...





This is a 2005 Dodge 2500 CTD/Auto/4x4 Long box crewcab with a Bully Dog Triple Dog with Outlook. I was driving in the towing mode which is the optimal fuel setting. Speeds were varied from 40-70mph and a few stops for in town traffic.

I can't assure it's 100% accurate but even assuming a maximum 15% error that still gives us over 17mpg.
Motor Slut is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old January 13th, 2008, 05:59 PM   #2
steveo
In the band!
 
Join Date: 03-30-07
Location: montana/wyoming
Posts: 20,293
iTrader: (6)
Mentioned: 0 Post(s)
Default

photoshop
steveo is offline   Reply With Quote
Old January 13th, 2008, 06:00 PM   #3
scottie
American Leyland??
 
scottie's Avatar
 
Join Date: 11-05-05
Location: Sweet home Georgia on my mind
Posts: 8,489
iTrader: (2)
Mentioned: 1 Post(s)
Send a message via AIM to scottie
Default

yeah, i get quite angry with diesel trucks, they can tow a shit load and get better mileage than i can.
scottie is offline   Reply With Quote
Old January 13th, 2008, 06:06 PM   #4
brimy311
Smells like a Fork Liftis
 
brimy311's Avatar
 
Join Date: 11-05-05
Location: Kzoo, mi
Posts: 4,092
iTrader: (42)
Mentioned: 0 Post(s)
Send a message via AIM to brimy311
Default

That fuel meter lies more then UPRockToy. There is a reason ppl refer to them as the "lie-o-meter". Hand calculate it, you'll see, well unless you don't know Maff.
__________________
JcrOffroad.com
Like us on Faceook!
brimy311 is offline   Reply With Quote
Old January 13th, 2008, 06:07 PM   #5
Monkeyevil
I <3 Miatas
 
Monkeyevil's Avatar
 
Join Date: 11-05-05
Location: Kalamazoo, MI
Posts: 8,987
iTrader: (16)
Mentioned: 2 Post(s)
Send a message via AIM to Monkeyevil
Default

Read.
http://www.pirate4x4.com/forum/showt...highlight=Fuel
__________________
JcrOffroad
Zoom Zoom!
Monkeyevil is offline   Reply With Quote
Old January 13th, 2008, 06:19 PM   #6
clarkstoncracker
lol
 
clarkstoncracker's Avatar
 
Join Date: 11-03-05
Location: OC - MI
Posts: 42,536
iTrader: (40)
Mentioned: 116 Post(s)
Send a message via AIM to clarkstoncracker
Default

Quote:
Originally Posted by brimy311 View Post
That fuel meter lies more then UPRockToy. There is a reason ppl refer to them as the "lie-o-meter". Hand calculate it, you'll see, well unless you don't know Maff.
Whats weird with my WJ, is the digital meter is actually under estimating my MPG.

Using the trip odometer vs gallons put in, I get around 18 mpg, where the digital meter says usually around 16 mpg. Thats a big difference.
__________________
clarkstoncracker is offline   Reply With Quote
Old January 13th, 2008, 06:35 PM   #7
Motor Slut
I put the Ick in Dick.
 
Motor Slut's Avatar
 
Join Date: 11-10-05
Location: 49963
Posts: 2,411
iTrader: (0)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by Monkeyevil View Post

I don't want to buy Pirate4x4.
Motor Slut is offline   Reply With Quote
Old January 13th, 2008, 06:38 PM   #8
Motor Slut
I put the Ick in Dick.
 
Motor Slut's Avatar
 
Join Date: 11-10-05
Location: 49963
Posts: 2,411
iTrader: (0)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by brimy311 View Post
That fuel meter lies more then UPRockToy. There is a reason ppl refer to them as the "lie-o-meter". Hand calculate it, you'll see, well unless you don't know Maff.
It's a work truck and I don't drive it enough to calculate the mileage.
Motor Slut is offline   Reply With Quote
Old January 13th, 2008, 07:06 PM   #9
clarkstoncracker
lol
 
clarkstoncracker's Avatar
 
Join Date: 11-03-05
Location: OC - MI
Posts: 42,536
iTrader: (40)
Mentioned: 116 Post(s)
Send a message via AIM to clarkstoncracker
Default

Quote:
Originally Posted by Motor Slut View Post
It's a work truck and I don't drive it enough to calculate the mileage.
Why do people make a big deal about calculating mileage? If you always fill up the tank, its as simple as pushing in the trip button.
__________________
clarkstoncracker is offline   Reply With Quote
Old January 13th, 2008, 08:38 PM   #10
Haggar
Covered in mud...
 
Haggar's Avatar
 
Join Date: 11-06-05
Location: Oxford, MI
Posts: 17,647
iTrader: (55)
Mentioned: 1 Post(s)
Default

Two things here:

1) The fuel usage meters aren't very accurate, and are calibrated on the optimistic side. I'm rather curious about the bully dog setup... is that a piggy back? Know how they work, on a signal level? And how those signals are also used to calculate estimated fuel usage?

2) Most importantly, varied between 40-70, probably a 55-60 average, and I'm guessing in the UP... which means flat, straight, and very few stops.

I can completely see that mileage for that situation, unloaded truck (sled does nothing), those driving conditions.

For example, no matter the vehicle, when I visit my parents (180 mile round trip, completley flat very few stops, 55mph two lane roads, in the thumb), our vehicles get 20-30% higher mileage than our normal mileage. Last trip there with my V10 dodge, I got 11.7mpg towing an 8500lb load (large tractor with loader, forks, other stuff), that be 8-9 mpg down here.
Haggar is offline   Reply With Quote
Old January 13th, 2008, 09:08 PM   #11
Roadhouse
DrivewayJeeper
 
Roadhouse's Avatar
 
Join Date: 11-05-05
Location: Sanford
Posts: 10,956
iTrader: (5)
Mentioned: 4 Post(s)
Default

I don't know how accurate those digital overhead calc. are. But I took a trip with Ironman in his old '04.5 Cummin dually w/4.10 gears. I looked at the over head a couple times and it said 22-23mpg. His truck had a some kinda chip, airfiler and exhaust if I remember correctly.

I'm sure that over stated what he was getting...but it must of been high teens at least.
Roadhouse is offline   Reply With Quote
Old January 13th, 2008, 09:21 PM   #12
GreaseMonkey
Senior Member
 
GreaseMonkey's Avatar
 
Join Date: 11-04-05
Location: Madison Heights, MI
Posts: 17,984
iTrader: (22)
Mentioned: 1 Post(s)
Default

In my experience I've found those fuel mileage calculators to be pretty accurate.

I swapped my truck with my Uncle's '05 Grand Cherokee a few years ago for a week to go down to Panama City Beach for spring break.

5 adults and loaded with luggage, we averaged 18 mpg round trip, including some driving around the area. I reset the fuel mileage gauge and the trip meter. We left with a full tank.

After all was said and done, the computer calculated 17.8 mpg, while the final math was 18 even. I'd say that's pretty accurate.

The same may not be true for all vehicles though.
__________________
Quote:
Originally Posted by kerryann View Post
I am not a lesbian but if I was I would do her.
GreaseMonkey is offline   Reply With Quote
Old January 13th, 2008, 09:26 PM   #13
Brods
Senior Member
 
Join Date: 01-21-07
Location: Salem, Mi
Posts: 704
iTrader: (2)
Mentioned: 0 Post(s)
Default

The CTD BS meter accuracy varies widely in stock form. Best ever empty with stock ECM program was 19.8 mpg, overhead said 23.5 mpg. (the overhead was only reset at each fillup). Normal highway is around 18 so that 19.8 was probably a short fill up. Some have posted their overheads read lower than actual mpg. The only way to know is to check it over several tanks.

A Dodge tech posted this on another forum:
The ECM rcvs inputs from sensors,and knowing fuel pulse widths,Injector flow #s rpm,map tables etc computes the #s.There are no flow or fuel psi sensors involved.

It is simple to understand why a aftermarket box will screw up the mpg accuracy, the ECM simply does not know that the box has held the injector open longer or raised the rail pressure allowing more fuel to go into the engine, so the ECM thinks less fuel was injected and displays higher mpg than actual. When you have a performance box any hope for accuracy is gone.
Brods is offline   Reply With Quote
Old January 13th, 2008, 09:36 PM   #14
scottie
American Leyland??
 
scottie's Avatar
 
Join Date: 11-05-05
Location: Sweet home Georgia on my mind
Posts: 8,489
iTrader: (2)
Mentioned: 1 Post(s)
Send a message via AIM to scottie
Default

i've always found them to be pretty acurrate, but they've all been GM cars.
scottie is offline   Reply With Quote
Old January 13th, 2008, 10:27 PM   #15
kickstand
sHaMoNe!
 
kickstand's Avatar
 
Join Date: 09-20-06
Location: fenton
Posts: 31,107
iTrader: (46)
Mentioned: 30 Post(s)
Default

Quote:
Originally Posted by Brods View Post

It is simple to understand why a aftermarket box will screw up the mpg accuracy, the ECM simply does not know that the box has held the injector open longer or raised the rail pressure allowing more fuel to go into the engine, so the ECM thinks less fuel was injected and displays higher mpg than actual. When you have a performance box any hope for accuracy is gone.
Exactly.

My truck will average 25 mpg at 40-55 mph on a fairly flat stretch with no stop and go.

Get over 60 and I immediately drop to 18ish. get over 70 and I drop to 16

thats a gas truck, my point is that diesels WILL get great mileage in the 40-60mph range. I don't doubt 17 mpg at those speeds. but you will not get that mileage towing a load at 70 mph.
kickstand is offline   Reply With Quote
Old January 13th, 2008, 11:28 PM   #16
gofastbobby
The guy Dale doesn't know
 
gofastbobby's Avatar
 
Join Date: 03-10-07
Location: kalamazoo, mi
Posts: 4,182
iTrader: (1)
Mentioned: 0 Post(s)
Default

the best i ever got with a diesel was with my 85 f250 reg cab 2wd. i got 22mpg on a drive to lima ohio and back.
__________________
Quote:
Originally Posted by FlatFender View Post
America! Fuck yeah!
gofastbobby is offline   Reply With Quote
Old January 14th, 2008, 05:52 AM   #17
Viperdave
A-1 Dave Costa
 
Join Date: 03-12-06
Location: Wolcott, Ct
Posts: 1,106
iTrader: (2)
Mentioned: 0 Post(s)
Send a message via AIM to Viperdave
Default

my 06 mega cab 4wd 3.73 gear auto averages an honest 20-21 at 70mph empty... and i do calculate it by hand... once over 70 it drops like a rock... it does have a programmer on it
Viperdave is offline   Reply With Quote
Old January 14th, 2008, 06:54 AM   #18
95geo
newbie
 
95geo's Avatar
 
Join Date: 11-05-05
Location: dryden
Posts: 5,775
iTrader: (6)
Mentioned: 0 Post(s)
Default

they are not very accurate and also the fact that you have a tune in it makes it worse.

miles traveled/gallons to fill it up (after another fill)= actual mileage (after you factor in the correct rolliing diameter of your tires)

my DIC sometime reads 18 and I'll get 16, other times it'll say 22 and I'll get 17

if you would like Ill get a picture of my average at 99mpg, possible?
95geo is offline   Reply With Quote
Old January 14th, 2008, 08:24 AM   #19
84Scrambler
Senior Member
 
Join Date: 11-07-05
Location: Lansing
Posts: 5,942
iTrader: (8)
Mentioned: 0 Post(s)
Send a message via AIM to 84Scrambler
Default

The overhead lie-o-meter in my CTD has told me 22mpg before. Actual was 17. I hand calculate every tank. It isn't difficult or time consuming. I don't know why Dodge bothers putting those things in. They cost money and don't work. 20.3 probably equates to 16.5 in real life.
84Scrambler is offline   Reply With Quote
Old January 14th, 2008, 08:33 AM   #20
FORD FLARESIDE
Someday, yeah Someday
 
FORD FLARESIDE's Avatar
 
Join Date: 04-09-06
Location: Comstock Park
Posts: 21,630
iTrader: (24)
Mentioned: 7 Post(s)
Default

Quote:
Originally Posted by 84Scrambler View Post
The overhead lie-o-meter in my CTD has told me 22mpg before. Actual was 17. I hand calculate every tank. It isn't difficult or time consuming. I don't know why Dodge bothers putting those things in. They cost money and don't work. 20.3 probably equates to 16.5 in real life.
Hand calculating only works if your tires are the right size for the gearing in your odometer.

Ford is notorious for undersizing the tire, which will roll the odometer up quicker and throw off the lie-o-meter.

That being said, I consistantly average 20+ with the powerstroke normal driving, and 17+ pulling either of my two rigs. (through my calculations:tonka:)
FORD FLARESIDE is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Tow rigs and trailers

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Forum Jump


All times are GMT -5. The time now is 03:13 PM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 0.35537 seconds with 81 queries