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03-19-2005, 04:31 PM
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#1
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Senior Member
Join Date: Mar 2005
Location: Abbotsford, BC
Posts: 229
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Can anyone out there with a 400hp Cummins (preferably on a 43' MH) provide information on your average fuel economy?
We're stepping up from a 300hp 40' MH (which gets around 9 mpg)to a 400hp (Cummins ISL) 43' Mountain Aire... and with fuel prices rising so rapidly, we'd like to have an idea of what we might be getting ourselves into. 
Thanks!
- John
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John
'05 Newmar Mountain Aire DP 4304 / '03 Honda CR-V EX manual toad
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03-19-2005, 04:31 PM
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#2
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Senior Member
Join Date: Mar 2005
Location: Abbotsford, BC
Posts: 229
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Can anyone out there with a 400hp Cummins (preferably on a 43' MH) provide information on your average fuel economy?
We're stepping up from a 300hp 40' MH (which gets around 9 mpg)to a 400hp (Cummins ISL) 43' Mountain Aire... and with fuel prices rising so rapidly, we'd like to have an idea of what we might be getting ourselves into.
Thanks!
- John
__________________
John
'05 Newmar Mountain Aire DP 4304 / '03 Honda CR-V EX manual toad
As a full-time RV'er, I love MailboxForwarding.com's service
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03-19-2005, 07:10 PM
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#3
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Guest
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....12 in my Volvo tractor loaded to 30,000#...t hen again I'm not a square brick....areo truck and v nose trailer....geof kaye
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03-20-2005, 12:22 AM
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#4
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Senior Member
Join Date: Feb 2000
Location: Erie, PA
Posts: 1,070
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 John & Peter, I would say not to except any more than 6-7 maybe 8 mpg according to what other owners have said. Ed. S
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2005 Newmar Mountain Aire W-24 , 2006 Jeep Commander Limited towed vehicle Newmar Kountry Klub 7284L, Pennsylvania State Directors
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03-20-2005, 03:44 AM
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#5
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Member
Join Date: May 2003
Location: Virginia
Posts: 41
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Towing our GMC Yukon XL toad we get about 8 - 8.5. Remember a diesel will have a sweet spot at around 2000 - 2200 RPM that will be the best mileage, then if you go above that spot by a mere 100 RPM you can loose 2 MPG.
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2004 Itasca Horizon 40KD, Cummins 8.9 ISL
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03-20-2005, 05:18 AM
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#6
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Senior Member
Join Date: Mar 2005
Location: Abbotsford, BC
Posts: 229
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Thanks, all.
Guess we'll just have to wait and see!
Foz: we'll definitely look at performance in that 2000-2200 rpm sweet spot.
__________________
John
'05 Newmar Mountain Aire DP 4304 / '03 Honda CR-V EX manual toad
As a full-time RV'er, I love MailboxForwarding.com's service
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03-29-2005, 08:05 PM
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#7
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Junior Member
Join Date: Sep 2000
Location: Was Naples FL. Now Tamassee SC
Posts: 4
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What speed are you going at the 2000 to 2200 sweet spot? My 02 40' Allegro Bus with a 350 Cummins is turning 1840 at 70 MPH. It does 68 MPH in 5th gear at 2150. I think I would have to break most speed limits to reach the sweet spot in 6th.
Later ...Harry...
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03-29-2005, 08:27 PM
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#8
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Senior Member
Alpine Owners Club
Join Date: Jun 2004
Location: Indy Lakes, Indianapolis, IN.
Posts: 1,364
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I thought  the RPM that the engine makes the most torque would produce the best mileage. My ISC makes the most torque from 1300 to 1600 and according to my VMSpc that seems to be where I get the best mileage. 2000 RPM is pushing the big barn door pretty close to 80 mph  , and at that speed I'm sure my mileage will not be good.
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Tom, Patty and Abby Kat, Greenwood, Indiana
2000 36' FDS 72232, Towing '05 PT GT Conv
Our Photos
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03-30-2005, 03:49 AM
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#9
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Moderator Emeritus
Join Date: Oct 2002
Location: Sheboygan, WI
Posts: 2,566
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The biggest factor is the wind resistance, which increases exponentially as the speed increases. There's a big difference between driving at 60 versus 70. Unfortunately, I didn't by a coach with a Cummins 400 to drive at 60 so I pay at the pumps.  
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Mark & Leann Quasius
2007 Allegro Bus 42QRP - Cummins 400 ISL
2012 Jeep Wrangler Unlimited - Rubicon
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04-05-2005, 11:48 AM
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#10
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Member
Join Date: Sep 2002
Location: Titusville, FL
Posts: 45
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With 5,000 miles on mine, my overall average is 7.4 mpg. Most of my driving is interstate and I'm usually cruising around 60-65...
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Ron Altman
TGO, Titusville, FL & Deer Creek MC Resort, Galax, VA
2013 Entegra Cornerstone (on order), 2011 Jeep Rubicon
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04-05-2005, 11:50 AM
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#11
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Member
Join Date: Sep 2002
Location: Titusville, FL
Posts: 45
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Opps, I forgot to upgrade my profile... 2005 Allegro Bus with Cummins 400
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Ron Altman
TGO, Titusville, FL & Deer Creek MC Resort, Galax, VA
2013 Entegra Cornerstone (on order), 2011 Jeep Rubicon
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04-05-2005, 04:46 PM
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#12
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Member
Join Date: Apr 2000
Location: Texas
Posts: 33
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I had a B series 24 valve that had a sweet spot ( more power better fuel mileage )according to Cummings at 2,400-2,700. This was a 24 valve engine. THe engine manufacturer can give you the skinny on hte sweet spot. My current 12 litre 400 likes to run at 1,400-1,600 this is between 55 and 70 mph
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1997 Mack CH 613 400/1460
2000 London Aire
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