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Open Roads Forum  >  Class A Motorhomes  >  All

 > FUEL MIL.BETWEEN CAT AND CUMMG.

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LG

okla.

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Posted: 04/01/02 02:23pm Link  |  Print  |  Notify Moderator

I HAVE A 36 FT DIP.WITH THE 315 8.3 CUMMINGS ENG AND PULL A 5000 P\U.I GET ABOUT 61\2 TO 8 MILES TO THE GALLON.WHAT DO YOU GET WITH THE CAT AND CUMMINGS PULLING BETWEEN 24000 TO 30000 LBS DRIVING 65 TO 75 MPH.I HAVE HEARD THAT THE CATS DO A LOT BETTER THAN THE CUMMINGS.????????????

Ames

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Posted: 04/01/02 02:35pm Link  |  Print  |  Notify Moderator

Cat 3126B 330 HP Motorhome 29000 Plus and Toad 4000 Grossing probably close to 34000. Average Speeds 65 to 70 mileage 7.5 it is mostly flat in my area of the country (Southeastern US). I do not percieve a large difference in fuel usage between Cat and Cummins they are both excellent engines.


Richard and Babs and a Bob Tail Cat
97 Beaver Patriot 40 Kitchen Slide
330 HP Member FMCA, BAC, Good Sam, CAT RV Club
Toad 2012 Dodge Durango RT AWD Hemi

LG

okla.

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Posted: 04/01/02 02:42pm Link  |  Print  |  Notify Moderator

I HAVE HAD PEOPLE TELL ME THEY ARE GETTING 10 TO 14 MILES TO THE GALLON.I OWN A TRK LINE AND THE BEST WE GET WITH THE 18 WHEELERS IS 6 MPH.I THINK THE PEOPLE GETTING 10 TO 14 DON'T KNOW HOW TO FIG.FUEL MILEAGE.MY DEALER TOLD ME IT WOULD GET 14 MPH TOO AND I LAUGHED AT HIM.

Ipanema

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Posted: 04/01/02 03:04pm Link  |  Print  |  Notify Moderator

With my Cats 3208TA, I got about 0.7MPG.
Oh, did I say that was on my 43,000# motoryacht?
LOL.....I also do not think there is much difference given equal size engines and given equal maintenance meaning clean fuel and filters and injectors working properly.


Ed and Lilian




Penn State Class of 1956


Peralko

San Antonio, Texas

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Posted: 04/01/02 03:08pm Link  |  Print  |  Notify Moderator

I have a 350hp 3176 Cat, and run 7.5 to 8.5 MPG at about 72MPH. Our gross is around 33,000 and we tow a toad most of the time. Milage is a lot more dependent on wind than it is on towing though.


Peralko
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wolfe10

Texas

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Posted: 04/01/02 03:12pm Link  |  Print  |  Notify Moderator

LG

I DO know how to figure fuel mileage. I also question any one tank's fuel economy because filling a motorhome tank depends on the angle of the tank and amount you top off. Anyone can get great mileage for one "short fill" tankful.

We have the Cat 3116 (250 HP), Allison 3060 (in economy mode 99% of time) and 5.29 rear axle ratio. Weigh 23,000 with no toad. We drive 55 mph (1750 RPM) and have AVERAGED 11.3 mpg over the last 30,000 miles. Tire pressure correct, air filter clean, and drive strictly for economy.

This is not on flat roads only-- we have spent the last four winters in Mexico, climbing serious mountains. Limiting max speed to 55 mph and proper maintanance are the secrets. If 55 mph sounds too slow, we got into motorhoming after cruising on our sailboat for many years AT 6.5 MPH! 55 is like warp speed. If we were not retires, time would mean more to us and we would drive faster and use lots more fuel. We decided to slow down and smell the roses.


Brett Wolfe
1997 Safari Sahara 3540
EX: 1993 Foretravel 36' U-240


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KOG

Winterville GA

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

The specific fuel consumption of CAT and Cummins engines is VERY close. Closer than your ability to figure mileage. So if you get 6.5mpg it's not due to brand of engine. It's due to the load you are pulling due to weight and speed.

covey115

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Posted: 04/01/02 04:44pm Link  |  Print  |  Notify Moderator

I have a 98 Dutch Star with a 3126 Cat, 300 HP & tow a 93 wrangler. Wt is about 30,000 + wrangler at 3000 = 33,000 lbs. Running 65 on fairly level roads and no wind, I get around 10.5 mpg. Add wind, other than tail wind, and mph changes downward and of course mpg now depends on wind speed. Add hills and wind and I get around 8 - 8.5 mpg. So, what you have basically asked is a question that depends on road conditions, how one drives and dear old mother nature. Any way, Happy RV'in!!!!




Adam And Charlie (100 lb Bk Lab)
04 Damon Escaper, 2010 Ford Explorer maybe!

LG

okla.

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Posted: 04/01/02 05:23pm Link  |  Print  |  Notify Moderator

BRETT.
LOOKS LIKE YOU ARE TRYING TO PROVE ME WRONG.YOU ARE THE ONLY ONE OUT OF WHAT 6 OR 7 THAT IS GETTING THAT GREAT FUEL MILEAGE.I HAVE NOTICED THE PEOPLE THAT GETS THAT KIND OF FUEL MILEAGE ARE OLDER CAT ENGINES BEFORE 1995 AND MOST OF THEM SAY THEY DO DRIVE 55 AND STAY ALIVE.NOT A THING WRONG WITH THAT.I HAVE RUN TRKS ALL MY LIFE AND I DID NOTICE A BIG JUMP IN FUEL MILEAGE WHEN WE WENT TO THE N14 BIG BLOCK AND STAY UNDER 450 HP.THE ELECTRONIC ENGINES HAVE NOT DONE ANY BETTER THAN THE MANUEL ENGINES HAVE.IS YOUR CAT A ELECTRONIC OR MANUEL ENG.

LG

okla.

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Posted: 04/01/02 08:34pm Link  |  Print  |  Notify Moderator

I HAVE NOT SEEN ANY CUMMINGS ENG DO 10 OR BETTER EVEN THE 5.9 275 HP SO I GUESS THE CATS IN GOOD COND.AND DRIVING RIGHT THEY DO GET BETTER FUEL MILEAGE.THANKS
LG

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