Snabag
Sarnia Ontario, Canada
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Joined: 10/25/2003
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What milage can be expected from cat 400 hp pushing a 40 ft motorhome with gross weight 35,800 lbs (2005 Beaver Monterey)
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CK
Htgn WV
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Joined: 06/14/2002
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you will get many responses ,here is the truth 6.5 to 7.2 if you run 40 mph or 80 mph thats it ,,some people will flat out lie and tell you they get 12 mpg do not believe them
Chuck Charlotte Andy Zach Three Labs Winston Maggie and Harley
2005 Newmar Mountain Aire 4304
Escalade Toad,My/FatboySE,Wifes/RoadkingSE /my StreetGlide
20year's of camping
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Blake and Deb
Conroe, TX
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Joined: 12/24/2005
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We average between 7 and 8 mpg on flat terrain at posted speed limits and normal wind conditions. 2005 Monaco Windsor, 400 Cummins.
Blake and Deb
2005 Monaco Windsor 40 PAQ
2006 f250 Lariat toad
Currently Bakersfield, CA. soon, Houston, TX
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gouficanuk
quebec city
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Joined: 10/31/2006
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96 tradition 5.9 cummin 8M on a 3000M trip quebec to ft lauderdale
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Vettejim
N.W. Indiana
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Joined: 10/21/2006
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CK wrote:you will get many responses ,here is the truth 6.5 to 7.2 if you run 40 mph or 80 mph thats it ,,some people will flat out lie and tell you they get 12 mpg do not believe them
CK is exactly right, I have an 06 Eagle, 400 hp Cat, weighs around 36K
and his figure of 6.5 to 7.2 is right on the money, It just doesn't seem to matter how you drive it. I truly believe you couldn't get better mileage if you pushed it off a cliff. I love to hear these guys telling anyone who will listen, they get 11 plus MPG with the same type coach, I was born at night, just not last night.
2006 American Eagle 40J TS
2006 Grand Cherokee Limited 4X4, Hemi
2003 Dakota 4X4
2000 Corvette on a Bri-Mar trailer
Ruby & Willy, the Cavalier King Charles Spaniels
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2ndhom
Eugene, Oregon
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Joined: 06/09/2008
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We have a 2006 Beaver Monterey Cat 400 and usually average between 8 - 9 on an open highway. 7 if we experience switch-backs on country roads or coast highway of Oregon or California. Not towing anything.
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JDenPA
Newfoundland, PA
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Joined: 07/31/2006
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We usually tow. Get between 6.5 and 7.5 depending on wind and road conditions.
2006 Monterey
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Diplomat Don
Moorpark, Ca
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Joined: 04/09/2005
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Because of the design of the fuel tanks on most DP's, you can't get an average mpg from one tank to another. At any given fill-up, depending on coach angle, these tanks can be off by 5-10 gallons. Any good mileage estimate needs to be made over several fill-ups.
We've made two 2500-3000 trips the last two years over flat and mountainous terrain where the first and last fill-up occurred at the same station and the same island/pump.
The first trip we averaged 8.2 mpg on our 28000 pound coach with the Cummins ISL 400 driven at 63 mph.
This year, we averaged 8.7 mpg while towing, but we reduced our speed to 57 mph and tried to eliminate hard acceleration and racing up grades.
Don & Mary 
2005 Monaco Diplomat 36SKT
400 Cummins 
2007 Dodge Dakota 4WD
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burgess001
Springfield, MO USA
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Joined: 04/08/2002
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33,000 lb coach
5,000 lb toad
C7 Cat
55-60 MPH
No wind
Relatively Flat
No A/C
New Air Filter
7.5 to 8.0
And, it matters a lot how fast I go.
75 MPH drops it to almost 6.0
Jerry and Katie
More than 20 great years motorhoming and still loving it...
2004 DSDP 3810 (more than I needed...less than I wanted)
2004 Trailblazer (too heavy but well worth dragging)
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Buck62
Charleston, South Carolina
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Joined: 04/28/2005
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I have the Cat C-9 (400hp) and a 40 foot coach that weights 34,000 pounds and I get 6.5 mile per gallon and I tow. does'nt matter if it is on a highway, going up or down hills, winter or summer. It is a constant 6.5 according to my information center mileage gauge.
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