Go Back   Montana Owners Club - Keystone Montana 5th Wheel Forum > GENERAL DISCUSSIONS > Tow Vehicles & Towing
Click Here to Login

Reply
 
Thread Tools Display Modes
 
Old 09-26-2009, 01:55 AM   #1
corncob
Seasoned Camper
 
Join Date: Feb 2008
Location: Brooklyn
Posts: 76
M.O.C. #8226
2009 Duramax Mileage

What kind of mileage numbers are owners getting when you are towing the Montana with a 2008/9 GM Duramax? I am looking at the 09 truck and hearing mileage will be less than the one I have due to the 'new' exhaust. Supposedly, the new exhaust sprays fuel on the particle collector to burn it off, thus reducing mileage. It certainly seems like a moot point to me. Probably an issue for ones that idle much of the time.
Any thoughts?
corncob is offline   Reply With Quote
Old 09-26-2009, 03:10 AM   #2
exav8tr
Montana Master
 
Join Date: Sep 2006
Location: Casa Grande
Posts: 5,369
M.O.C. #6333
We have an '08 and we get between 9.5 and 11.5, depending on conditions and terrain.
exav8tr is offline   Reply With Quote
Old 09-26-2009, 05:56 AM   #3
Jolu
Montana Master
 
Join Date: Nov 2007
Location: Canon City
Posts: 1,340
M.O.C. #7919
Our 08 is the same as exav8tr. At times it appears to get better mileage in tow haul mode. I am still evaluating the tow haul mode mileage. I think it all depends on the terrain.
Jolu is offline   Reply With Quote
Old 09-29-2009, 06:10 PM   #4
dmaxmountaineer
Seasoned Camper
 
Join Date: Sep 2009
Location: rutherford
Posts: 68
M.O.C. #9691
I only towed mine for about 50 miles, but while doing so i got about 10.8 mpgs doing around 65-70. It only uses that extra fuel once per tankfull. The truck isn't constantly regenerating. It all depends how much city driving and idling you do. But on average, it will do it once a tank full. When running empty i get about 21mpg's and with regen, it brings it down to about 10. I would guess that if i'm getting 10 towing, then the regen can't get much worse.
dmaxmountaineer is offline   Reply With Quote
Old 10-03-2009, 01:58 AM   #5
cmp-shooter
Montana Fan
 
Join Date: Jun 2005
Location: WARE
Posts: 393
M.O.C. #3928
I was just on a 3 week vacation with my 2009-3500 dually
[ and montana] with
3000 miles + I got 9.2 most of the time and should goto 10 after break in......I get 15 to 17 while NOT TOWING ACCORDING TO DASH READ OUT.
cmp-shooter is offline   Reply With Quote
Old 10-06-2009, 07:35 AM   #6
padredw
Montana Master
 
Join Date: Oct 2004
Location: Ore City Texas
Posts: 1,604
M.O.C. #2224
Send a message via Skype™ to padredw
We just returned from an RV trip to California and up through Utah to Colorado and back across New Mexico and much of Texas. Our average for the entire trip, mostly towing but some local driving, 11.15. What I noticed is that wind proved to be the biggest factor affecting mileage. Even over some major passes in Colorado, the mileage evened out, but wind can be a "no win" situation:

[imghttp://dwilliamson.com/TripMiles.jpg[/img] This jpg is too large and causes many folks to have to scroll to read posts. Please use as a link or reduce size to comply with MOC policy.
Thank you,
RVWheels

Neglected to say that our pickup is a 2008 Silverado, Duramax/Allison. I use "Tow/Haul" only in the mountains.
padredw is offline   Reply With Quote
Old 10-08-2009, 12:56 PM   #7
KathyandDave
Montana Master
 
Join Date: Aug 2008
Location: Shelburne
Posts: 688
M.O.C. #8693
Send a message via MSN to KathyandDave
HOW DO i reset the mileage in the dic. I think I'm looking at the average of all miles since the truck woke up in the plant.
KathyandDave is offline   Reply With Quote
Old 10-08-2009, 12:57 PM   #8
KathyandDave
Montana Master
 
Join Date: Aug 2008
Location: Shelburne
Posts: 688
M.O.C. #8693
Send a message via MSN to KathyandDave
Does the regen stink? We notice that sometimes we get a strong diesel exhaust smell.
KathyandDave is offline   Reply With Quote
Old 10-08-2009, 01:39 PM   #9
exav8tr
Montana Master
 
Join Date: Sep 2006
Location: Casa Grande
Posts: 5,369
M.O.C. #6333
KathyandDave, while the MPG is displayed in the DIC, push the check mark at the bottom. This will start it all over again. When I start on a leg I usually reset it to zero to see how I am doing.
exav8tr is offline   Reply With Quote
Old 10-08-2009, 04:19 PM   #10
KathyandDave
Montana Master
 
Join Date: Aug 2008
Location: Shelburne
Posts: 688
M.O.C. #8693
Send a message via MSN to KathyandDave
That sounds easy! I'll try it. Thanks.
On edit, it worked! I had to hold it down a couple of seconds.
KathyandDave is offline   Reply With Quote
Old 10-18-2009, 12:12 PM   #11
corncob
Seasoned Camper
 
Join Date: Feb 2008
Location: Brooklyn
Posts: 76
M.O.C. #8226
Have not towed the Monty yet with the 09 Duramax, but drove it over 700 miles bringing it home and averaged 20.5 mpg running at 69 mph by GPS. Around town, at 17 mpg. Thus same as the 06.
Regards
corncob is offline   Reply With Quote
Old 10-18-2009, 12:20 PM   #12
Delaine and Lindy
Montana Master
 
Join Date: Jan 2007
Location: Linden
Posts: 1,890
M.O.C. #6650
We had a 2008 Chevy LTZ 3500HD DRW's 4x4 with all options and towing our 5er Gross weight was 24,400 lbs we averaged between 9.5 to 11.5 running at 60 mph. Bob-tailing we got 15 to 17 mph running 70 mph. Corncob your mileage sounds awesome. GBY.....
Delaine and Lindy is offline   Reply With Quote
Old 10-19-2009, 02:22 AM   #13
Bill and Ann
Montana Master
 
Join Date: May 2004
Location: Napanee
Posts: 3,440
M.O.C. #1493
We went on a trip to Nashville this summer with Potvin who has an 09 2500 GMC Crew. Our truck is the same but it is an 03. When we stopped for diesel we were putting in the same amount so I would say the MPG hasn't changed much.
Bill and Ann 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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2006-2009 3500 Duramax SRW for TV bigskyjimmy Tow Vehicles & Towing 14 02-28-2015 07:14 PM
Duramax Mileage jimr Tow Vehicles & Towing 35 03-31-2009 04:02 PM
F350 SRW and 2009 3000RK Mileage William O. Phillips Tow Vehicles & Towing 19 06-12-2008 12:20 PM
Better Mileage stiles watson Tow Vehicles & Towing 68 12-13-2007 01:56 PM
Fuel mileage for the new LBZ Duramax?? Montana Sky Tow Vehicles & Towing 5 12-30-2005 04:41 PM

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Montana RV, Keystone RV Company or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 06:05 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×