Join Truck Conversion Today
Reply
 
LinkBack Thread Tools Display Modes
 
Old 08-22-2016, 09:38 AM   #1
Senior Member
 
bushpilot's Avatar
 
Join Date: Jul 2011
Location: Tomball
Posts: 1,276
Default Fuel MPG

Im curious what others are getting...


We've been having some discussions and it seem i (mysteriously get good mpg)...admittedly i have a heavy foot, i have been typified (by more than one LEO) as an aggressive driver.

We are 42 feet, single rear axle, MBE 4000 (450hp) and ZF/Meritor 12 speed (manu-matic).

We tip the scale at 36k lbs (moderately loaded w/ fuel & 220g of fresh water), not including the ('12) Jeep Wrangler Sport (2 door soft top) that weighs in around 4200lbs

We consistently obtain 9.9 MPG, and have rarely seen lower than 8.0.

We have seen as high as 13 and change (low speed) secondary roads where we were barely able to maintain 60mph (fog & night driving) from Atlanta to Destin.

Towing 11k lb race/car trailer did not effect or mpg.
__________________

__________________
Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw - Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over
bushpilot is offline   Reply With Quote
Old 08-22-2016, 10:15 AM   #2
Member
 
jasong's Avatar
 
Join Date: May 2015
Location: Full time on the road
Posts: 69
Default

The fact the trailer did not effect you tells me your rat end gear is to low.
__________________

jasong is offline   Reply With Quote
Old 08-22-2016, 10:25 AM   #3
Senior Member
 
Kenn's Avatar
 
Join Date: Sep 2010
Location: Willamina Or
Posts: 275
Default fuel consumption

Don you do go a long way on a gallon of fuel. My rig is much older and smaller. 1982 Peterbilt 359 with a 450 hp Cummins STC (step timing control). The engine is a 1987. I have a 13 speed manual transmission with 336 rear end. I am 30' long and weigh just under 25 K loaded and tow a trailer 7K or Scion XB 2600 lbs. 1500 rpm in 8 th direct gives me 60 mph. My best has been 9.7 and worst 7.8 with an average around 8.8. I am sure that my big square bunk above the cab has bad aero drag and in a head wind I use more fuel. I try to end each trip with a fuel-up at the same fuel pump thinking that I would be more accurate with my fuel use. I don't have a gauge that shows real time fuel use so I run the engine where it feels like it is in a sweet spot.
Kenn is offline   Reply With Quote
Old 08-22-2016, 10:45 AM   #4
Senior Member
 
bushpilot's Avatar
 
Join Date: Jul 2011
Location: Tomball
Posts: 1,276
Default

I've just confirmed our coach came from Freightliner with a 3.21 rear

at 72mph we are turning just under 1500 rpm (sorry for the blurry picture, but all of these were taken w/ the cruise control set, no tricks)

72 MPH ->

65 MPH ->

65 MPH ->
__________________
Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw - Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over
bushpilot is offline   Reply With Quote
Old 08-22-2016, 10:50 AM   #5
Senior Member
 
bushpilot's Avatar
 
Join Date: Jul 2011
Location: Tomball
Posts: 1,276
Default

Quote:
Originally Posted by jasong View Post
The fact the trailer did not effect you tells me your rat end gear is to low.
I dont understand how you arrived at that, 6k (more lbs) then than jeep wrangler shouldn't really effect us.

a 10k lb trailer that is hidden in the air stream of the coach shouldn't really have any impact imo.
__________________
Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw - Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over
bushpilot is offline   Reply With Quote
Old 08-22-2016, 10:39 PM   #6
Senior Member
 
samcrimm's Avatar
 
Join Date: Sep 2015
Location: Tullahoma
Posts: 267
Default

I don't know what my rear end is but I only get 65mph out of 1500 rpm, I have been wanting to get a picture but cant get the gps and the tach together and stay between the paint. I looked in the driver side door jams and did not see a gear ratio just wt info. Here are the pictures of the info I do have.

7 miles to the gal Sam
Attached Thumbnails
IMG_20160822_221116.jpg   20160822_221042.jpg  
__________________
2005 Renegade #1204 42 footer Columbia M3200CH-435,12 speed auto Cat 12 kw Genset, Roadtrip Mission in-mot Dish Network, Washer dryer combo, Jeep Liberty toad,1973 Cessna Skylane,1955 Chev 210 Belair survivor
samcrimm is offline   Reply With Quote
Old 08-23-2016, 06:00 PM   #7
Senior Member
 
samcrimm's Avatar
 
Join Date: Sep 2015
Location: Tullahoma
Posts: 267
Default

Been on the internet looking and wondering. Take a look at this, MERCEDES Tuning & Performance | MBE-4000 Highway Truck it deletes your EGR and if you have Def looks like it too. Any one heard of this? What do you think? I have local dealer that I called today and will get a price tomorrow so we can see how this factors into things.

Also my chassis is a 2003 and the RV a 2005. Wonder if that has something to do with mileage?

Sam
__________________
2005 Renegade #1204 42 footer Columbia M3200CH-435,12 speed auto Cat 12 kw Genset, Roadtrip Mission in-mot Dish Network, Washer dryer combo, Jeep Liberty toad,1973 Cessna Skylane,1955 Chev 210 Belair survivor
samcrimm is offline   Reply With Quote
Old 08-23-2016, 09:06 PM   #8
Senior Member
 
samcrimm's Avatar
 
Join Date: Sep 2015
Location: Tullahoma
Posts: 267
Default

Found a pdf on the MBE 4000 performance and Economy here is link.

https://www.google.com/url?sa=t&rct=...Uyq9Kg&cad=rja

Sam
__________________
2005 Renegade #1204 42 footer Columbia M3200CH-435,12 speed auto Cat 12 kw Genset, Roadtrip Mission in-mot Dish Network, Washer dryer combo, Jeep Liberty toad,1973 Cessna Skylane,1955 Chev 210 Belair survivor
samcrimm is offline   Reply With Quote
Old 08-23-2016, 11:24 PM   #9
Senior Member
 
Join Date: Mar 2015
Location: Tijeras (Albuquerque)
Posts: 129
Default

I have twin screw rear and 45 ft length and approx 36K lbs for the coach. Cummins ISX15 and 10 speed Eaton Ultrashift. I typically run 70-72 on interstates, which is about 1550 rpm for me. I think I have 3.36 rear gear, but have not ever really checked for sure. I don't regularly check mileage, but it is around 7 mpg. Mine is not aerodynamic, so I might do better if I drove slower. Usually towing a toad around 4K lbs, sometimes a trailer with car on it around 6K lbs. Toad or trailer does not make much difference in mpg, but can feel it when accelerating from a stop.

My engine has EGR, but no DPF or DEF. I have heard of 10-15% increase in mpg with an EGR delete, but nobody seems to have the real programming figured out to avoid the CEL and getting max performance potential.
__________________
2005 Kenworth Showhauler 45 ft total length
twin screw, 450 hp ISX, 10 speed Ultrashift
38Chevy454 is offline   Reply With Quote
Old 08-24-2016, 10:58 PM   #10
Junior Member
 
Join Date: Aug 2016
Location: Hanna City
Posts: 1
Default

47 feet/41K Lbs/8 MPG running 71 MPH
__________________

__________________
2008 NRC Conversion/Freightliner Columbia twin screw
515 Detroit/12 Speed ZF
2016 Ford F150 Limited for tow
RGulley is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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
Trackbacks are On
Pingbacks are On
Refbacks are On


» Virginia State Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 02:20 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.