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Old 03-03-2014, 10:12 AM   #15
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If you are worried about MPG, you can't afford it!
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Old 03-03-2014, 11:24 AM   #16
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First, buy the Coach you like NOT THE ENGINE (when you're debating between a Cummins 500 or 600), it's the Coach that matters not the motor!!
Second: Being an anally retentive, retired aerospace engineer, I keep records, accurate records!! We purchased a Newmar Essex (500 Cummins ISM) in June of 2013. We have driven it 9080.00 miles on 43 "Trip Segments" covering terrain from the Great Smokey Mountains through the flats of Texas and their associated winds. The 43 segments delivered a "Best Fuel Mileage" of 7.7 MPG and a worst of 6.3 MPG and an aggregate average of 6.87 MPG! That's driven at an average speed of 60 MPH, typically with "Mode" selected on the transmission. These figures are not guesses but are taken from the Silverleaf Computer at the completion of each "trip leg" and then stored in a spread sheet on my computer.

In the end you have control of 1 element within the equation... your speed... everything else "Is What It Is"!
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Old 03-03-2014, 05:06 PM   #17
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We have an 07 Eagle 45H with a 500 ISL and run about 60-62 mph pulling an 08 Honda CRV most of the time. We avg about 6.5-7.0 hand calculated most everytime we travel.
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Old 03-03-2014, 05:27 PM   #18
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I had a 40 ft phaeton with 450 hp and now have a 45 ft travel supreme with a 600 hp. Both 2007-2008, both pulling same toad, both making exact same annual trips over the same roads and hills...
Both average 6.8 to 7.0 mpg.
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Old 03-03-2014, 06:07 PM   #19
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I had a 40 ft phaeton with 450 hp and now have a 45 ft travel supreme with a 600 hp. Both 2007-2008, both pulling same toad, both making exact same annual trips over the same roads and hills... Both average 6.8 to 7.0 mpg. Jus sayin Jeff
Is your engine the C15 Cat or the Cummins ISX15.
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Old 03-03-2014, 06:57 PM   #20
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ISX
Both Cummins
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Old 03-04-2014, 05:56 AM   #21
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mpg

Had ma 505 cat and got 6.5 up to 8 a few times, traded for a 600 cat and it will never get better than 5.5 at any speed. My old 505 would run circles around the 600. My two cents wish I had my 505 in this new coach!
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Old 03-04-2014, 09:51 AM   #22
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You don't purchase one of these beasts and be concerned with MPG. That's really not the selling point to one. How does it fit your lifestyle? Will you be comfortable living in it? Will it fit where you want to go? Does it have the features your better half likes? The latter will be the deciding factor....trust me I know!!!
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Old 03-04-2014, 12:24 PM   #23
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MPG

We have a 2001 Monaco Exec w/ 500 hp Cummins . Driving down to AZ in Jan. Got about 4 mpg. I kept it at 1500 rpm ,60-65 mph for the first fill. Thought I would increase the mph and rpm, 1700-1800 @65 to 70 mph. Still got 4 mpg. I guess it don't make any difference. On my old Discovery I got about 8 to 8.5. It costs $ for comfort!
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Old 03-04-2014, 02:07 PM   #24
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We have a 45' Monaco Signature (40000#+) and tow a Jeep GC (5300#). The coach has a 515hp Detroit, which is plenty of power for this vehicle. We consistently are getting right around 6.5 mpg and try to stay between 58-60 mph. This is the sweet spot for the engine at about 1600 rpm. Have seen 7.5 and 6.0mpg depending on terrain.
X2 on the series 60 in 2005 Sig
Last trip was just a quick relocation at 70 mph I did a tad better than 6.2 - that was I 10 Texas to California
Have seen 5.6 av at 63 mph driving speed - Dallas to Jasper return - the hills and headwinds will make a big difference.
The generator will grab 1/2 mile per gal. Mine would have run 50% of the time on these trips.
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Old 03-04-2014, 02:11 PM   #25
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We have a 2001 Monaco Exec w/ 500 hp Cummins . Driving down to AZ in Jan. Got about 4 mpg. I kept it at 1500 rpm ,60-65 mph for the first fill. Thought I would increase the mph and rpm, 1700-1800 @65 to 70 mph. Still got 4 mpg. I guess it don't make any difference. On my old Discovery I got about 8 to 8.5. It costs $ for comfort!
These are very sad numbers - I think a tune up might be in order - pump / injectors. Are you getting much black smoke out the exhaust?
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Old 03-04-2014, 03:39 PM   #26
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We have a 2001 Monaco Exec w/ 500 hp Cummins . Driving down to AZ in Jan. Got about 4 mpg. I kept it at 1500 rpm ,60-65 mph for the first fill. Thought I would increase the mph and rpm, 1700-1800 @65 to 70 mph. Still got 4 mpg. I guess it don't make any difference. On my old Discovery I got about 8 to 8.5. It costs $ for comfort!
You should make it a point to keep up with your fuel consumption for a few thousand miles. If your Milage turns out to be correct then you have an issue of some description. That is an M11 or ISM and the Milage should be 7-8. At the speeds you report, the worst should be 6.5-7. I'm suspicious that you might have a fuel leak which could be a safety concern.
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Old 03-04-2014, 04:42 PM   #27
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Joe Namath played CC Rider...I have a C-7 so I can't help the OP...
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Old 03-04-2014, 04:48 PM   #28
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Joe Namath played CC Rider...I have a C-7 so I can't help the OP...
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