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Old 11-21-2014, 10:58 AM   #21
RKassl
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Don't blame the tires they are not the problem, believe me we are on second set.
 
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Old 11-23-2014, 12:24 PM   #22
woodman
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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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Old 11-23-2014, 01:01 PM   #23
Tom S.
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I still think it's winter fuel. It's notorious for dropping fuel economy.
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Old 11-23-2014, 03:22 PM   #24
drsmart
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If you keep this up, you'll have everyone switching from G614's to Marabombs

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Old 11-23-2014, 04:41 PM   #25
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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.
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Old 11-23-2014, 10:53 PM   #26
Phil P
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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.

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Old 11-26-2014, 03:27 AM   #27
Mark N.
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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!"
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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Old 12-23-2014, 11:51 AM   #28
clarkandsheila
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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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Old 12-24-2014, 04:47 AM   #29
richard66
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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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Old 01-05-2015, 12:14 PM   #30
jcurryii
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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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Old 01-14-2015, 06:05 AM   #31
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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?
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Old 01-14-2015, 06:26 AM   #32
rohrmann
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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.
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Old 01-14-2015, 06:36 AM   #33
Goin 4 Broke
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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...
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Old 01-14-2015, 09:11 AM   #34
DQDick
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You won't go wrong taking the tire worry out of the deal.
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