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Old 01-09-2016, 12:27 AM   #43
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o'contrair

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LOL!

There is absolutely no way a diesel motor home is going to AVERAGE 10 mpg. Those who say they are getting into double-digit mpg numbers are either exaggerating or they just don't know any better. Yes, you might average 10+ mpg over a hundred miles or so with a howling tail wind, but you will never achieve a long-term average that high.
on a trip from Detroit to Jasper National Park with 6 top ups , trying to fill the tank as much as possible , we avg 10.8 mpg @55 and @60 got 10.4 mpg avg and that was 2500 miles ,

it is a 99 American Tradition 40 VS 330 hp Cummins 6 spd Allison
40 ft
I get a kick out of people that won't believe that all motor homes or their drivers are the same as theirs

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Old 01-09-2016, 12:37 PM   #44
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Well let's see Bev - those of us that actually have a coach that DOES get 10 mpg have been called liars and informed that there is NO WAY a diesel MH can get 10 mpg (which you and I both know it CAN) even though, in my cas, my rig does that very thing consistently.... If you talk to anyone that owns a Berkshire, you will find that we all get fantastic mileage with our Berkshire...

As far as having enough power and torque with a 330 hp rig, I can HONESTLY say I've never had a single situation where I wished I had more of either... We've been over passes in excess of 12K feet and were totally pleased with our speed at the top... Backed up very little traffic going up (actually backed up more going down when I downshifted and used the engine brake)
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Old 01-09-2016, 02:34 PM   #45
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Horsepower vs mileage

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Originally Posted by ernest917 View Post
Well let's see Bev - those of us that actually have a coach that DOES get 10 mpg have been called liars and informed that there is NO WAY a diesel MH can get 10 mpg (which you and I both know it CAN) even though, in my cas, my rig does that very thing consistently.... If you talk to anyone that owns a Berkshire, you will find that we all get fantastic mileage with our Berkshire...

As far as having enough power and torque with a 330 hp rig, I can HONESTLY say I've never had a single situation where I wished I had more of either... We've been over passes in excess of 12K feet and were totally pleased with our speed at the top... Backed up very little traffic going up (actually backed up more going down when I downshifted and used the engine brake)

For relevance, what is your loaded with toad power to weight ratio? At 425HP and 42K lbs, I'm at 10HP per 1000 lbs.
The physics of this stuff matters!
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Old 01-09-2016, 04:53 PM   #46
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Got no idea.... All I know is loaded with everything we need plus pulling our toad, we get 10 mpg which is all that matters to me...

Actually, isn't that the point ??? I'm assuming that's the factors we all should use... Do we get to load our coaches with all the "stuff" we want (not necessarily need) and pull our toad and still get the fuel economy that makes us happy.

If your 500hp does that for you - great... My 330 hp does it for me...
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Old 01-09-2016, 05:27 PM   #47
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2014 Bershire 390 BH-60, Cummins 360 HP, Allison MH3000 6 Speed tranny. Ok there are the spec's GCVW 35k pulling a MKX four down. Two trips over the Rockies 10.4 avg mph.
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Old 01-09-2016, 05:31 PM   #48
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Horsepower vs mileage

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Got no idea.... All I know is loaded with everything we need plus pulling our toad, we get 10 mpg which is all that matters to me...

Actually, isn't that the point ??? I'm assuming that's the factors we all should use... Do we get to load our coaches with all the "stuff" we want (not necessarily need) and pull our toad and still get the fuel economy that makes us happy.

If your 500hp does that for you - great... My 330 hp does it for me...

Your specs say 340HP with gross wt of 28K. You have about 12HP/1000. Good to have some extra power, and much easier to do with a light weight DP.
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Old 01-09-2016, 05:31 PM   #49
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Just another comment, those with 450, 500 or 600 HP power plants seldom keep there speeds between 63-65.
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Old 01-09-2016, 05:32 PM   #50
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Old 01-09-2016, 05:43 PM   #51
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Just another comment, those with 450, 500 or 600 HP power plants seldom keep there speeds between 63-65.
Actually I do pretty well, although I did get a speeding ticket in CA (my first in over 30 years) in CA for going 67. Just too new to the Magna on a smooth, (unusual in CA) downhill stretch!
The cruise control is your friend!!
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Old 01-09-2016, 05:50 PM   #52
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We are newbies to the forum and look forward to hearing your opinions. We owned a 2002 Monaco Diplomat 40PDQ with a 330 hp Cummins. We pulled a Jeep Liberty as our toad. Our only issue wasn't so much the fuel mileage but the lack of power pulling in the mountains. We sold the coach several years ago because we didn't have the time to really enjoy all the things the rv lifestyle has to offer. We have since retired and want to buy another coach. The question is we are looking at several 40 ft coaches that have over 500 hp engines. We love the idea of the extra hp and torque but how much will our fuel mileage suffer ? Any thoughts on the pros and cons would be appreciated.

The engine in most diesel coaches is a function of the GVWR. I can give you my experience.
I just drove 700 miles from East Tennessee to Melbourne Beach, Florida. My coach is an '03 with a 500 hp Cummins ISM. It has over 100k on the clock. The terrain was varied from the up and down of the Pigeon River gorge to the flat land of Florida. I drive 62-65 mph. I got 8.5 mpg on this trip. My life time average is about 7.8. My AquaHot burner is turned off when on the road and if I run the generator, I allow 1/2 gal per hour for that.

Just one guys experience.
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Old 01-09-2016, 07:45 PM   #53
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I don't have a cummins.... I have the Mercedes Turbo diesel which is a totally different animal....
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Old 01-10-2016, 04:24 AM   #54
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We have a 2004 Monaco Dip.Went over a pass in Colorado got 4 mpg up grade ,but going down i bet we got 85 mpg,lol
We really do not worry to much about gas mileage,unless it is something like full filter,etc causing the problem.We got the m/h to see the U.S. saving on motels,eating out so much,repairs.we may be ahead of the curve.But the thing is we love the life we have chose.Just start the engine & go were you want.
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Old 01-10-2016, 10:02 AM   #55
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I would love to hear the answer to the question regarding the edge?


Mike
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Old 01-10-2016, 07:00 PM   #56
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wt to hp

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For relevance, what is your loaded with toad power to weight ratio? At 425HP and 42K lbs, I'm at 10HP per 1000 lbs.
The physics of this stuff matters!
11.38 to 1000
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