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11-21-2014, 10:58 AM
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#21
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Montana Master
Join Date: May 2005
Location: Fall Creek
Posts: 1,328
M.O.C. #3699
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Don't blame the tires they are not the problem, believe me we are on second set.
__________________
Bob and Nancy Kassl Fall Creek, Wisconsin
2015 Montana 3440RL Legacy Edition, G614's, Pressure Pro TPMS, Dish Tailgaters
2016 GMC Sierra Denali 3500 CC SRW, Iridium Metallic, Duramax Allison Transmission
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11-23-2014, 12:24 PM
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#22
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Montana Fan
Join Date: Feb 2012
Location: Elkhart Lake
Posts: 141
M.O.C. #12256
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We've now traveled another 700 miles and the numbers have improved ever so slightly, but definitely still less than on the Marathons. That's a total of 1350 miles so far on the "G" tires. Weather is warming up as we head south, so that may have contributed to a bit better fuel efficiency. The G614's are a wider tire, which means there's more contact surface meeting the road, hence; more resistance. I know they're a heavier tire, but believe it or not, we've actually lightened our cargo, so our GVWR is actually less than last year. I was initially just trying to figure out why my mileage was down when all the other variables seemed essentially the same. This is the perfect forum to find out what others have experienced and determine if this is just some anomaly or if it's consistent with what others have found. Thanks for all your input and thoughts.
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11-23-2014, 01:01 PM
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#23
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Montana Master
Join Date: Aug 2007
Location: Waterford
Posts: 3,693
M.O.C. #7500
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I still think it's winter fuel. It's notorious for dropping fuel economy.
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11-23-2014, 03:22 PM
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#24
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Montana Fan
Join Date: Aug 2010
Location: Dundas
Posts: 406
M.O.C. #10690
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If you keep this up, you'll have everyone switching from G614's to Marabombs
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11-23-2014, 04:41 PM
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#25
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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I still say, based on the number of Montana's I've seen by the side of the road or pulling into a campground with side damage, that I'd give up a good deal of mileage to get rid of the OEM tires if I had to.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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11-23-2014, 10:53 PM
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#26
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Montana Master
Join Date: Mar 2011
Location: Okeechobee
Posts: 2,150
M.O.C. #11206
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Hi
We have about 80,000 miles on the Montana and all but about 3,000 of that on G614s.
The truck was new when we change to the G614 and still getting 6 to 7 miles to the gallon. At about 30,000 on the truck our mileage started improving rapidly.
We now average 12 MPG on the highway with the Montana at 60 MPH and 18 MPG on the highway bobtail at 75 MPH.
I haven’t found any difference in mileage between winter diesel and summer diesel. The Cetaine in diesel doesn’t change like the Octane in winter gasoline.
I find this compares closely with most of the folks here on the forum.
Phil P
__________________
2009 Montana 3665RE
2009 Duramax 3500 DRW quad cab
personal web page https:// www.sallyscoffees.com
If you get a page not available then remove the "s" after HTTP
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11-26-2014, 03:27 AM
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#27
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Montana Master
Join Date: Oct 2013
Location: Ogden
Posts: 638
M.O.C. #13862
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Quote:
quote:Originally posted by PackerFan
I was told a long time ago "If you are worried about fuel mileage buy a Prius...Not an RV!"
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And remember: It's not and "either/or" proposition. I did both! I have a 1 ton diesel AND a Prius.
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12-23-2014, 11:51 AM
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#28
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Montana Fan
Join Date: Dec 2007
Location: Somewhere
Posts: 214
M.O.C. #7994
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If you have a turbo boost guage on the truck, become familiar with it. On my own I have found that at ~ 10# boost at 55-58mph that we are running on a relatively flat road, no up or down grade and no wind.
If I notice either less or more then something outside is affecting operation. Wind, or grade, dragging brakes.
But it will take some time and attention to learn where the boost guage will reside on a flat road with no wind.
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12-24-2014, 04:47 AM
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#29
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Montana Fan
Join Date: Jun 2006
Location: fort myers
Posts: 126
M.O.C. #5896
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Run what you can afford and are comfortable with. If you tow 20 miles to the lake on weekends and then home your requirements differ greatly from a full timer or folks who take 10k trips. Buy all means get rid of the ST tires. If buying trailer from dealer make tire replacement part of the deal.
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01-05-2015, 12:14 PM
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#30
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Montana Fan
Join Date: Jun 2012
Location: somerville
Posts: 135
M.O.C. #12636
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Changed to G614's last fall, seem to be getting the same mileage as before on same round trip to Gulf.
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01-14-2015, 06:05 AM
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#31
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Montana Fan
Join Date: Jan 2015
Location: Elgin
Posts: 140
M.O.C. #15975
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What is the approximate cost to upgrade? I am still working the numbers with my dealer on a 3900FB. What would be a good price for them to change out to G614?
__________________
Jeff and Kristi
2015 F350 King Ranch Crew Cab SB 6.7 PSD
2013 3900FB
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01-14-2015, 06:26 AM
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#32
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,676
M.O.C. #12947
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I paid about $1900 a little over a year ago for 5 G614's installed. If you can get them all replaced for $1000, I would consider it a good deal. Of course, I would start at a lower price, not sure what their price is for those tires, and they are also trying to sell the trailer too. Whatever deal you work out, you are wise getting started with the right rubber.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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01-14-2015, 06:36 AM
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#33
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Montana Fan
Join Date: Jan 2015
Location: Elgin
Posts: 140
M.O.C. #15975
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Thank you for the prompt response. The tires and axles are my biggest worry having read lots of forum posts. I am saving a good amount on a non-current model and I will convince my wife that the extra for the tires is worth it... Now if she will just approve the slide toppers, the satellite dish, the TPMS, the rear camera AND the BD3...
__________________
Jeff and Kristi
2015 F350 King Ranch Crew Cab SB 6.7 PSD
2013 3900FB
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01-14-2015, 09:11 AM
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#34
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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You won't go wrong taking the tire worry out of the deal.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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