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Open Roads Forum  >  Class A Motorhomes  >  All

 > FUEL MIL.BETWEEN CAT AND CUMMG.

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Chuck S.

Tonasket, Wa. 98855

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Posted: 04/01/02 08:48pm Link  |  Print  |  Notify Moderator

LZ, I am running 10mpg in the mtns. and 11.5 on the flat. This is figured on trips of 6-8000 miles. My rig weighs 24000 and I'm towing a Saturn at 2480lbs. Pushed by a Cummins 275 ISB. This has been figured from Alaska to Pennsylvania to Texas. I travel at approx. 63-64 mph because my tranny drops into 6th at about 60-61. Any difference between Cat and Cummings ,of similar size, will be in your foot not in the engine.

wolfe10

Texas

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Posted: 04/01/02 08:49pm Link  |  Print  |  Notify Moderator

LG,

Ours is the mechanical (non-electronic) injection Cat 3116 with 250 HP and 650 Ft-LBS at 1560 RPM. Also, the Foretravel Unihome is a 96" width and is more aerodynamic than most. Again, 55 mph and good maintanance are the keys.


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/

nathan

Fort Myers, Florida

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Posted: 04/02/02 06:08am Link  |  Print  |  Notify Moderator

We average 11mpg but have gotten up to 12.5 on level roads. Some of our mileage has been mountain driving. We have 10,000 mils on a cummings isb 260 with a five speed allison tranny. We drive between 55 and 65 with 65 a maximum. Maybee we have been lucky or like Brett conservative. Very happy with milage so far and we log it at least every other fill up.


Nathan & Becky Smith
2014 Allegro Open Road 31SA
2008 Saturn

LG

okla.

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Posted: 04/02/02 02:12pm Link  |  Print  |  Notify Moderator

I AGREE THAT MOST MOTOR HOMES WILL NEVER GET BROKE IN.MAKES YOU WONDER WHAT THEY WILL HAVE IN THEM 10 YEARS FROM NOW.
LG

coilmaker

Covington,Ga U.S.A.

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Posted: 04/02/02 07:50am Link  |  Print  |  Notify Moderator

LG

I have the 275 ISB cummins engine and 90% of the time I am using the toad. With accurate records on fuel purchases over the last 20,000 miles I have averaged 10.88 miles per gallon to date. I try to maintain a top speed of 65 and do not force it in the mountains. Propably 30% of my driving is in the mountains with the rest fairly flat. I do have the 6 speed allison which is better on mileage than the 5 speed. Like the earlier post though, the mileage go to you know where in a head wind faster then when towing.


Ed
370 Santara pusher Toad-Explorer Sport

CamToo

Pacific, WA, USA

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Posted: 04/02/02 11:46am Link  |  Print  |  Notify Moderator

Having a 2001 Dutch Star Cat with a Freightliner Chassis and Alison 6 speed tranney, I have had some time to talk with truck drivers .. so far .. and this survey would never be taken seriously .. the drivers have consistently liked Cat .. a few have NOT liked Cummins .. I have no idea why. There were some other considerations:
· Truckers estimate the truck they use will provide 1 ½ million miles of service before they will consider trading up.
· The Cat engine will have traveled a minimum of 100,000 miles before it BEGINS to perform in the manner it will as an adult.
This tends to say that most motorhome owners never get to experience their engines full potential.
· There are so many elements drawing on the engine during operation and such varied driving conditions that MPG is moot, at best.
Thus, the EPA mileage, which tests the engine unloaded and standing alone, would be the only figures which COULD give some indications.
My limited research is that between the two engines, their mileage figures are VERY similar.
Interesting topic .. thanks
Kindest Regards,
Cam


Peralko

San Antonio, Texas

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Posted: 02/12/03 06:36am Link  |  Print  |  Notify Moderator

Munki,

So you are saying Wolfe10 doesn't know how to calculate mileage? I know Brett personally, and I am quite confident in his abilities to figure mileage correctly, and he is also very knowledgable about all other aspects of motorhomes.


Peralko
USAF Retired
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2006 Nissan Maxima

justme

USA

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Posted: 02/12/03 09:51am Link  |  Print  |  Notify Moderator

I have Cat 3126E and get an average of 8MPG with 27,000lbs pulling a 3000lb car. The only difference between CAT and the others is the new smog system CAT is useing. CAT is the only one not useing the EGR method which is not as good as the CAT system. The fuel effiecency is yet to be determined. CAT may have leap frogged the competition on this one.

PUSHTOY

Everywhere USA

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Posted: 02/12/03 09:32am Link  |  Print  |  Notify Moderator

Has any one fidgured in the GENI fuel, Or did they forget about that, Maybe that,s why the milage is so low. The hi milage coaches could have a propane GENI.


GREG and LAUREN
2001 Endeavor 40FT. ISC 330
Dakota Quadcab 4x4 toad
FMCA 200924,GS Lifetime,CB.CH.13
Teamster Local 710 retired

Munki



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Posted: 02/12/03 05:42am Link  |  Print  |  Notify Moderator

I am a fuel monitoring specialist within a large canadian company and can guarantee, that you could not get over 8 MPG on a 3116 cat motor idling in your yard. The difference between cat and cummins engines inasmuch as fuel consumption is concerned is almost unmeasurable. The largest increase in fuel economy outside of a healthy maintenance program is going to be a healthy driving style.

ps if someone told me they were getting 14 mpg in a truck i would tell them that they dont know the difference between Kilometers and Miles.

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