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STEVEP220

VA.

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Posted: 03/27/12 08:57am

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I own an ISB 300 hp cummins. I think I get 10 mpg in a 38 ft diesel pusher on flat land. What MPG do you get with same engine? Thanks.

Bounder Billy

Colorado

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Posted: 03/27/12 09:23am

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I have the Cummins ISB 6.7L with 325 hp/750 ft lb torque, and we get 8.5mpg in Colorado with the altitude and mountains, and on flatland and lower altitude we get 10mpg.

2008 Expedition 38F
2002 Jeep Liberty Sport

Tom/Barb

Oak Harbor

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Posted: 03/27/12 09:31am

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Our ISC 8.3 / 350 horse with a banks 425 chip in it, gave us 10.2 over 11,000 mile trip from Seattle to Mystic Seaport, Williamsburg, grand canyon and Seattle. We place the Alison tranny in economy, and the cruise control on 65.

2000 Newmar mountain aire 4081 DP, ISC/350 Allison 6 speed, Wrangler JK toad.

JackMS

Gulfport

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Posted: 03/27/12 03:43pm

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6.5 to 7.5. But I can't drive 55. I'm always in a hurry when I go somewhere but don't think I could ever get it to 10.

2005 Holiday Rambler Neptune 34pdd, Cummins ISB 300, Allison 2500MH, Onan 8.0QD
Toad-2001 Chevy 2500 CC 4WD
Toad-2012 Honda CRV, Blue Ox Aventa II

Texas TC

Corinth,Texas

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Posted: 03/27/12 05:05pm

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I generally drive 65-75 depending on the freeway and prevailing speed limits. I get 9-10 with a 340 hp ISB DEF engine in my '11 Journey Express 34Y towing a Silverado crew cab 4x4. I have been really pleased with this engine and the fuel economy it provides.

TxTC

2011 Journey Express
2011 Chevy Texas Edition Silverado 4X4 Extended Cab (In Tow)

rvrepairnut

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Posted: 03/27/12 09:48am

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STEVEP220 wrote:

I own an ISB 300 hp cummins. I think I get 10 mpg in a 38 ft diesel pusher on flat land. What MPG do you get with same engine? Thanks.

yes i have heard of the small DP with the ISB getting 10 in easy conditions(flat land) 55-60MPH

mscamping

any place, USA

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Posted: 03/27/12 05:41pm

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8.7mpg use to get 9.5 to 10.2 before ultra-low sulfur..I drive 65 on the interstates and 55 to 60 on back roads as conditions will allow.. Mike M..

2003 Holiday Rambler Neptune 36 PBD - ISB 300 Cummins- Allison MH2000 5 speed
2009 HHR w/Blue Ox Aventa II & SMI Stay-n-Play Duo
FMCA 331658 HRRVC 105155 Chapter - 57- Good Sam Life Member - Coach Net - 3/4 timers
Mike & Sharon

bluebarry1964b

Homestead, Florida

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Posted: 03/27/12 06:03pm

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Same engine as yours; We did 55 mph from California to Florida...got 10.5 mpg with a 34'.

wolfe10

Texas

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Posted: 03/27/12 06:08pm

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Guys,

Physics is physics.

Light, aerodynamic coaches with "reasonable" HP modern diesel engines DO get 10 MPG.

This goes for Cummins B engines as well as Caterpillar 3116 and some 3126 powered coaches.

You can read these same numbers going back over a decade.

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/