Dog Trainer
Richmond Mi.
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Joined: 08/17/2006
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Our old B5.9 is tweaked up a bit from 230 to 300 HP. It turns in a constant 10.5 mpg and at 55 I can get 11. As wolfe10 pointed out you can read these numbers over and over for many years now.
93 Airstream 35' Dp
5.9 230 uprated to 300 HP
Allison MD 3060
Dutchess and Shadow Golden's Daktari Cavalier King Charles (fur Bearing Children)
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lennyjudym
naples
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Joined: 02/14/2009
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not the same engine but cummins 8.3 on a 32 footer we get around 12 at 1600 rpm. 60to 70 mph around any higher rpm we get ten .In Florida once with the wind behind us hard we got 13.5on flat land.
lenny
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DanTheRVMan
fl
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Joined: 10/15/2011
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at 61 to 62 mph on flat land towing 4800 lb minivan I get 9.6 to 9.7 mpg on flat land.
A loop around the country brings that down to 8.9 mpg
340 hp isb
Dan
Allegro Red 36ft
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J Walker
Oakton, Va
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Joined: 06/12/2003
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wolfe10 wrote:Guys,
Physics is physics.
Light, aerodynamic coaches with "reasonable" HP modern diesel engines DO get 10 MPG.
Brett, I like your term "reasonable" HP. I feel the same way. My 260 HP ISB is perfect in my case for a 36', 26,000 lb combined weight. My engine balances power with fuel economy just right. As higher and higher HP engines became available people wanted them and coach manufacturers made MHs bigger and heavier to match the engines. They are nice, big, MHs but they sure use the fuel not to mention having a high initial price.
Jim Walker
2000 34' Damon Ultrasport DP
2009 Malibu
Brake Buddy
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jdog
Some Place
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Joined: 04/09/2004
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Do the gassers get better or worse milage?
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wolfe10
Texas
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Joined: 10/08/2000
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jdog wrote:Do the gassers get better or worse milage?
Same size/weight coach, diesel ALWAYS better MPG.
Brett Wolfe
1997 Safari Sahara 3540
EX: 1993 Foretravel 36' U-240
FMCA Forum: www.community.fmca.com/index
Diesel RV Club:http://www.dieselrvclub.org/
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OTTO
Western Washington/Gold Canyon, AZ
Senior Member
Joined: 11/01/2001
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STEVEP220, I have your exact same engine. I get beteen 9-9.5. That is a loaded coach (supplies) and towing a Honda CRV. This is a combination of flat and mountainous.
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