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purplekeenah

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Posted: 12/27/19 06:04am Link  |  Quote  |  Print  |  Notify Moderator

The wife & I are contemplating a larger rig, one with a bath & 1/2 and king bed. Found a 2010 44' that has the 650 Cummins with 39K miles on it. Anyone here have a 600 ish in their rig that can give me an idea of what to expect fuel mileage wise?
We plan an extended trip late summer this year from southwest PA to Washington state which will include about all degrees of travel from flat lands, to mountains, etc.


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2bzy2c

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Posted: 12/27/19 10:33am Link  |  Quote  |  Print  |  Notify Moderator

There is always the old adage - "If you have to ask, you can't afford it." I figured someone would say this, so I went ahead and said it first.

To the point, I cannot help you but I am certain someone in here can offer some idea.


My advice is worth exactly what you paid for it.

Executive

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Posted: 12/27/19 10:36am Link  |  Quote  |  Print  |  Notify Moderator

Does fuel mileage in these beasts really matter? Asking for a friend. [emoticon].

Really, you bought the coach, you're going to use it. Budget 8 mpg and hit the road. My opinion is it really doesn't matter what mileage I get as long as I get there. If that is important to you then looking for price per gallon is more important. The Gas Buddy app might become your new BFF. If you pay 5 cents more per gallon and get 2 miles more per gallon than "Fred" then the actual cost of your trip will be more so fuel mileage doesn't matter. The way you drive your rig, the weather, wind etc. will have a dramatic effect on your mileage anyway. I get better mileage through Florida than I do climbing the Rockies to Denver. Best of luck....Dennis


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js218

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Posted: 12/27/19 10:43am Link  |  Quote  |  Print  |  Notify Moderator

^^^ Agree 100% mileage is my least concern


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purplekeenah

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Posted: 12/27/19 12:12pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the comments, I'm just trying to weigh a number of variables.
Dennis, you probably don't carry a calculator with you all the time, but what would you estimate your average mpg on your rig over a number of years? I know you've traveled all over this country, a number of areas we've also been thru. We've been in a couple of campgrounds together, such as Portal and Bella Terra, just never had the pleasure of meeting you and your wife.

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Posted: 12/27/19 02:44pm Link  |  Quote  |  Print  |  Notify Moderator

purplekeenah wrote:

Thanks for the comments, I'm just trying to weigh a number of variables.
Dennis, you probably don't carry a calculator with you all the time, but what would you estimate your average mpg on your rig over a number of years? I know you've traveled all over this country, a number of areas we've also been thru. We've been in a couple of campgrounds together, such as Portal and Bella Terra, just never had the pleasure of meeting you and your wife.


My average is around 10mpg depending on the weather mostly. I'm pretty conservative in my driving. i.e. coming to stop lights, 62mph etc. etc. Your mileage will suffer if you hot rod it, as though you could. [emoticon]. We weigh in at 49,000#. Hope this helps...Dennis

Ivylog

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Posted: 12/27/19 03:22pm Link  |  Quote  |  Print  |  Notify Moderator

MPG is not even in the ball park of possible expenses on that engine. You need to read these 32 pages on repeated #6 broken valve on the ISX engines: http://www.irv2.com/forums/f123/cummins-isx-broken-valve-in-6-a-401436.html
#6 broken valve
There is a post today on it in a 06 ISX...not sure yet if it was a 600 HP. I have a 06 525 HP that hopefully is not prone to this problem.
http://www.irv2.com/forums/f123/isx-cummins-failure-473121.html
2006 ISX


This post is my opinion (free advice). It is not intended to influence anyone's judgment nor do I advocate anyone do what I propose.

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purplekeenah

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Posted: 12/27/19 04:47pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the info Dennis.
Thanks for the links lvylog.

Blaster Man

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Posted: 12/27/19 05:59pm Link  |  Quote  |  Print  |  Notify Moderator

Ivylog wrote:

MPG is not even in the ball park of possible expenses on that engine. You need to read these 32 pages on repeated #6 broken valve on the ISX engines: http://www.irv2.com/forums/f123/cummins-isx-broken-valve-in-6-a-401436.html
#6 broken valve
There is a post today on it in a 06 ISX...not sure yet if it was a 600 HP. I have a 06 525 HP that hopefully is not prone to this problem.
http://www.irv2.com/forums/f123/isx-cummins-failure-473121.html
2006 ISX


Good advice. I would buy an new ISX, but not one of the older models.


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Ivylog

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Posted: 12/27/19 06:29pm Link  |  Quote  |  Print  |  Notify Moderator

I bough mine before reading about the broken #6 valve problem. Not a clear answer as to why nor what to do about stopping it from happening. Too soon to say the new and improved parts will solve the problem or the new engine. Why is this happening mainly in MHs and hopefully only in the 600-650 HP engines?

I was able to get a camera to the #6 intake and it didn’t look any different than the 4 or 5. I am using the “Ugly Fix” and I installed a metal freeze plug in the EGR tube at 46K miles and it now has 56K. At this point all I can do is cross my fingers and hope for the best as we really like this MH.

*OP, NO WAY would I buy a ISX, especially a 600-650 HP. I would keep what you have until a definite cause and cure is guaranteed...not there yet.

* This post was edited 12/28/19 05:42am by Ivylog *

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