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Old 03-24-2016, 08:51 PM   #43
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Old 03-24-2016, 08:57 PM   #44
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Good Info on the ISL engines I have in my favorites.

Helpful Cummins ISL Information
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Old 03-25-2016, 09:19 AM   #45
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The DEF is not as bad as some folks might think. I have it on the 2011 coach. I have the ISL and the DEF allowed the engine to be factory tuned to 380HP from 360HP with out DEF. This started in 2010. It is common to pull 6% grades for many miles when on the west coast. I have had no real issues doing so. We are rated at 32,500# but I the last time we were weighed we were a bit heavy. About 1600#. I have not reweighed since we shed some ##. But, DEF is not an issue. Filling the DEF tank on this rig is a bit of a hassle though. After it was built the standard DEF pump location is on the left at the Flying J, etc fuel stops. My DEF tank is on the right. In most cases, buying boxed DEF is more expensive than from the pump and a pain to handle. Fortunately you don't have to fill very often. I really have not figured how far I go between fills. The tank holds about 10Gal.

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Old 03-26-2016, 10:22 PM   #46
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The DEF is not as bad as some folks might think. I have it on the 2011 coach. I have the ISL and the DEF allowed the engine to be factory tuned to 380HP from 360HP with out DEF. This started in 2010. It is common to pull 6% grades for many miles when on the west coast. I have had no real issues doing so. We are rated at 32,500# but I the last time we were weighed we were a bit heavy. About 1600#. I have not reweighed since we shed some ##. But, DEF is not an issue. Filling the DEF tank on this rig is a bit of a hassle though. After it was built the standard DEF pump location is on the left at the Flying J, etc fuel stops. My DEF tank is on the right. In most cases, buying boxed DEF is more expensive than from the pump and a pain to handle. Fortunately you don't have to fill very often. I really have not figured how far I go between fills. The tank holds about 10Gal.

Rick Y
Some friends bought a new 2014 Fleetwood Discovery. He said fooling with the "wrong-side" DEF fill point was inconvenient, but he swore he was getting about 12 and sometimes 14 MPG.
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Old 03-27-2016, 09:03 AM   #47
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Some friends bought a new 2014 Fleetwood Discovery. He said fooling with the "wrong-side" DEF fill point was inconvenient, but he swore he was getting about 12 and sometimes 14 MPG.
MPG is a mixed bag. When running on relatively flat roads and small rolling hills my MPG is in that range or higher. On the 6% grades I may get as little as 2.5mpg but when we are on the other side I see 150mpg. I think my average on the dash readout is 7.6mpg in about 32k miles. Idle time and off highway travel will kill the mileage as we all know. I differently go further on my 100 gal tank in this coach than I did in my '05 with a non DEF 400hp ISL. I just did a trip from San Diego to Grants Pass, OR, about 485 miles on 65gals. That included running the generator at our overnight stop. As I stated earlier in this thread, the DEF allowed the engine to be increased to 380hp from 360hp without DEF to meet Fed standards and it does seem to give better fuel mileage.

Humans fight change and grumble much while learning to live with it. DEF is one of those changes that is not a bad thing and we simply need to learn how to deal with it. When the pumps are not busy I simply pull in against the normal traffic flow. When they are, I use the DEF pump on the lane to my right when it is freed. Never had anyone complain.

Happy trails,
Rick Y
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Old 03-27-2016, 10:08 AM   #48
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I have found the truck pumps to be very civilized. Most of the truck drivers I have encountered are curious and wanting to talk. We talk about our respective rigs as well as the road conditions.

DEF tanks on the opposite side are an inconvenience without a doubt. Thankfully they do not have to be filled every fill.
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Old 03-27-2016, 10:54 AM   #49
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...He said fooling with the "wrong-side" DEF fill point was inconvenient,....
The fix for that is easy. Buy your DEF at Wal Mart in a 2 1/2 gallon box and refill it on the coach when you get to the CG or home.
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Old 03-28-2016, 10:55 AM   #50
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The fix for that is easy. Buy your DEF at Wal Mart in a 2 1/2 gallon box and refill it on the coach when you get to the CG or home.
Tried that - not very convenient, a bit messy and then had to dispose of the container. We make a point of filling at the truck stop about every third fill.
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Old 03-28-2016, 12:38 PM   #51
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Tried that - not very convenient, a bit messy and then had to dispose of the container. We make a point of filling at the truck stop about every third fill.
You experienced what I was thinking. That stuff STINKS to boot. And the box on the shelf is more expensive in my experience.
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Old 03-28-2016, 07:53 PM   #52
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The fix for that is easy. Buy your DEF at Wal Mart in a 2 1/2 gallon box and refill it on the coach when you get to the CG or home.
From what I've learned from friends, the best "fix" is to tap into the DEF fill point and run a hose to the drivers side, then make a DEF fill point there.
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Old 03-31-2016, 05:45 PM   #53
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From what I've learned from friends, the best "fix" is to tap into the DEF fill point and run a hose to the drivers side, then make a DEF fill point there.
Can't see how on my coach. Besides, I'm not an autobody repair type guy.
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Old 03-31-2016, 09:03 PM   #54
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Should choosing the right Cummins on its HP/Torque Rating?

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Some friends bought a new 2014 Fleetwood Discovery. He said fooling with the "wrong-side" DEF fill point was inconvenient, but he swore he was getting about 12 and sometimes 14 MPG.

LOL!! Anyone who actually believes he can get 14 mpg in a 34,000 pound diesel motor home is living in a fantasy world.

I have some Pacific beachfront property in Nebraska he might be interested in. ;-)
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Old 04-01-2016, 08:11 AM   #55
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LOL!! Anyone who actually believes he can get 14 mpg in a 34,000 pound diesel motor home is living in a fantasy world.

I have some Pacific beachfront property in Nebraska he might be interested in. ;-)
My goal is 1/2 of that. Maybe some day I will get to 7 MPG.
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Old 04-01-2016, 08:28 AM   #56
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LOL!! Anyone who actually believes he can get 14 mpg in a 34,000 pound diesel motor home is living in a fantasy world.

I have some Pacific beachfront property in Nebraska he might be interested in. ;-)
I thought that was funny too. I'm measuring 8.2 MPG over my first 1000 miles of driving my 2015 Discovery 40G (preowned, has about 12k on it now)

The ISL in my Disco gets about 1 to 1.5 MPG less than my 2014 Excursion did with its 300 HP ISB (800 ft-lbs I think). Haven't had the Disco in the mountains yet, the Excurusion pulled our Murano ok on 5% and 6% grades last year. We slowed down, but it did not feel like it was straining.
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