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Thread: Fuel mileage on cat c-15

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    Senior Member aquitted's Avatar
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    Fuel mileage on cat c-15

    So reading one of the forums I see the cat c-15 doesnt get very good fuel mileage. Bummer because the stretched class 8 I was looking at has that engine in it. Anybody know how bad the mileage is and what are the preferred engines for fuel economy on A class 8 stretched D unit?

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    Senior Member MissKat's Avatar
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    C15 in a kw tractor pulling panther reefer 6 mpg

    Sent from my VS920 4G using EO Forums
    Commercial Driver since 1976. Older than dirt, somewhat wiser.

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    Re: Fuel mileage on cat c-15

    We need more info. Make and model, year, trans, gearing. Not all c15's are the same
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    Re: Fuel mileage on cat c-15

    Air cleaner and stacks gone or behind the sleeper and its a 6.5 truck. Could be 7 or 7.25 with a few other mods.
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    Senior Member zorry's Avatar
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    Would think a straight could do mid 7's . Prefered engine is usually a Detroit. Cummins next in my book. My class 8 n14 got mid 10's as a straight. Today my engine of choice would be '04 or older or '10 or newer due to emission concerns.
    OOIDA # 463 ( Yeah, an old fart ). Expediting....It beats working for a living

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    Re: Fuel mileage on cat c-15

    It also depends on what model year and first 3 letters in the serial number. I have 3 of them and they get between 6 and 8 MPG as a tractor trailer pulling trailer loads. Bobtailing they have done better than 10 mpg. You also will get more miles out of a CAT. That is why I bought them.

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    Senior Member zorry's Avatar
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    The biggest factor is the driver. 35% improvements best to worst drivers in large fleets. Tire pressure also a big factor on overall cost per mile of operation.
    OOIDA # 463 ( Yeah, an old fart ). Expediting....It beats working for a living

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    Re: Fuel mileage on cat c-15

    Quote Originally Posted by Dynamite 1 View Post
    We need more info. Make and model, year, trans, gearing. Not all c15's are the same
    07 freightliner cst 120 435 h.p. 3:23 rears 10 speed auto shift.

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    Re: Fuel mileage on cat c-15

    Caterpillar is a dishonest company that will deny your warranty and cheat you if they possibly can. Go Cat at your own risk. Cummins is a better engine with better mpg and a better company backing it up.
    It's okay if you disagree. I can't force you to be correct.

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    Re: Fuel mileage on cat c-15

    Quote Originally Posted by garyatk View Post
    You also will get more miles out of a CAT.
    ???? I've never heard of that being the case from anyone, be it a driver or an experienced mechanic. Do you have any backing for this statement?


    Livin' the dream
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    Re: Fuel mileage on cat c-15

    When I was doing my research, and finding out what I needed to do to get the most efficient trucks, I talked to many different sources. The suggestions I followed I were based on what made the most sense to me. My choices were Freightliners with CATS or Detroits or Volvo's with Cummins. I wanted 13 speed transmissions and the only thing I could get with that was Freightliners with CATS. The advice that I was given was that the CATS were best suited for the ECM upgrades that are available, and when you add the torque and horspower that we added, the CAT would be the best motor in the long run. I spoke with a man that did some of this tuning on an MBN and it is still running strong at 1.5 million miles with no onerhaul done yet. I believe that as long as I get good drivers, and give them proper maintenance I will see that kind of service also. I like my solid 7mpg, and my drivers like 600hp and 1850 ft/lbs of torque.

    Do I have proof? NO! But I felt it was best for what my choices were.

    Now to better answer this posts first question, I guess if I was looking to stretch a class 8 to make a D unit I would look for an 07' Volvo 780 with a Cummins and auto trans. You don't need what I have in a D unit, but I wouldn't be afraid of a CAT, especially if it is out of warranty...

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    Senior Member highway star's Avatar
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    Re: Fuel mileage on cat c-15

    Are you doing heavy haul? 600 ponies will certainly get some work done. Good drivers make all the difference, keep them happy and you should be as well.


    Livin' the dream
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    Re: Fuel mileage on cat c-15

    No, just regular tractor trailer work. But it is nice to get good MPG and the drivers to be able to climb hills like they are empty...

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    Re: Fuel mileage on cat c-15

    07 would be the last year I would do. No dpf, right. If so it could be ok. And I would say a 9mpg truck to start. I would much rather have a Detroit though. And a 12.7 Detroit at that. The 10 auto and 3.23's should be fine for this set up also. I would be looking at 03, 04, and 05's with this set up if it were me, just don't have faith in the newer models unless you are going to buy a brand new one.
    highway star likes this.
    T N T
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    Senior Member zorry's Avatar
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    I'm glad its working for Gary. His drivers must be well disciplined to use the hp wisely. If he gets large enough to get less selective about his drivers he may loose fuel and tire mileage. As a truck hauler I sold my '01 Star at 445,000 miles. I wasn't even thinking of drive tires yet. I was shocked when I learned my high hp co-workers were happy to get 225-250,000 out of there drives pulling the same loads. These were the 1850 ft lbs of tourque guys. If Gary doesn't have a fuel mileage bonus I'd suggest he plan for one in the future.
    OOIDA # 463 ( Yeah, an old fart ). Expediting....It beats working for a living

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