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  1. #1
    Light Load Member Moving on Down the Road's Avatar
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    Detroit Diesel, 06 515 HP fuel mileage

    We used to own a 2000 DDEC 12-liter, 430 HP in W900L pulling 53/102 dry box. KW ECM showed high 7's for fuel mileage. The best I ever did was 8.4. Looking at buying 2006 FTL Coronado high-rise condo, 18-spd, 3:58 and L/P lo-pro 22.5 and 53 dry box. Normally like to run 5 MPH below interstate speed limit and all east of Texas. Curious as to REAL fuel mileage expectations, if any of you have good experience with pre-07 DDEC motors. Thanks guys.....



  2. #2
    "Captain of the Ship" Captain Canuck's Avatar
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    The 14 litre doesn't do quite as well.... still, I'd guess that low 7s would not be unreasonable. With an 18 and 3.58s it's pretty well geared to run 65 unless it's a double overdrive, and might actually do worse if you slow down without running in direct.

  3. #3
    Road Train Member losttrucker's Avatar
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    Quote Originally Posted by Moving on Down the Road View Post
    We used to own a 2000 DDEC 12-liter, 430 HP in W900L pulling 53/102 dry box. KW ECM showed high 7's for fuel mileage. The best I ever did was 8.4. Looking at buying 2006 FTL Coronado high-rise condo, 18-spd, 3:58 and L/P lo-pro 22.5 and 53 dry box. Normally like to run 5 MPH below interstate speed limit and all east of Texas. Curious as to REAL fuel mileage expectations, if any of you have good experience with pre-07 DDEC motors. Thanks guys.....

    With all the egr crap compared to that 2000 you will be lucky to get 6.5.............I have an '05 mid-roof columbia with a 10speed and 3:55 gears and run 62-63mph, idle NONE and with the pittsburgh power muffler grossin 76k i can get about 6.6

  4. #4
    The Confuzeled lovesthedrive's Avatar
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    10 Speeds wont get the mpg of a 13/18 speed. I drove a 10 columbiaa and got terrible mileage. No thankyou. The truck I am looking at now has a 13 and should put me in the mid 7's in a century. I drove Century's for CR England with a 13, had no problem getting 7.6 with a load. Most of them were 500 hp. For that matter here is the specs of what I am looking at.

    2006 Century

    Cab TypeConvConfiguration
    TRACTORSleeper Size70"
    Sleeper Type
    RAISED-ROOF
    GVWR
    8GVW52,000 lbs.
    EngineDET 6014.0 515
    Engine Brake
    YES
    TransmissionFULLR RTLO-16913A
    Transmission Type
    OVERDRIVE
    Transmission Speed13

    Front AxleMBA-F12-3N
    Front Axle SetbackYES
    Front Axle WR
    12,000
    Rear AxleMRCBNRear
    Axle Type
    TANDEM
    Rear Axle Ratio
    3.42
    Rear Axle WR40,000 lbs.
    Wheelbase 229"
    Fuel TypeDIESEL
    Fuel Tanks Count 2
    Fuel Capacity
    200
    Suspension
    FRGHT Suspension ModelFA240000
    Suspension Type
    AIR

    5th WheelAIR SLIDE
    Front Wheel Type ALUMINUM
    Rear Wheel TypeALUMINUM
    BBC/Cab Length
    Roof Fairing
    NO Side FairingPartBody
    Length
    Exterior ColorMED RED
    Interior TypeSTANDARDInterior ColorGRAPHITE BLACK
    AC YES
    Mileage459,060
    Mileage Adj Price $ 37,250

  5. #5
    Road Train Member losttrucker's Avatar
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    Quote Originally Posted by lovesthedrive View Post
    !0 Speeds wont get the mpg of a 13/18 speed. I drove a 10 columbiaa and got terrible mileage. No thankyou. The truck I am looking at now has a 13 and should put me in the mid 7's in a century. I drove Century's for CR England with a 13, had no problem getting 7.6 with a load. Most of them were 500 hp. For that matter here is the specs of what I am looking at.
    Ok its early...lol...but the only difference between a 13sp and 10 sp is less of a difference between 9th and 10th gears unless you spend all your time pulling hills. A 13sp/18sp doesnt affect fuel mileage because the final ratio is about the same as a 10 speed being about .86 ratio and an 18speed is really only good for heavy haul. As far as 500hp motors well Detroit made improvments from the 05,06 14L to newer versions hence the better fuel economy on those engines.

    And as far as those spec's you may wanna do some research as that was a 9sp transmission converted to 13sp and the only benefit to switching it to a 13sp is resale value according to www.roadranger.com/ecm/idcplg?IdcService=GET_FILE&dID=204935 you would be better of having a 10 speed and running it in Direct drive then that 13sp with a final .73 but hey what do I know it's early and I haven't had coffee yet lmao

  6. #6
    Super Crusty
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    13 or 10 or 18 or whatever it dont matter im not a trans expert but the gear ratio in the rears is what you need to figure out to match the directdrive gear in the trans. if you want to pull a hill like there is no tomorow then gear low and sacrafice mpg. if you want mpg gear high and sacrafice power in the hills. i have a 16913 with 3.70s behind about 650 hp grossing an average of 126000 to 132000 and average 4.4 empty runing 65 i only get 6.2 at the best. but i set it up to pull a hill.

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  8. #7
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    I am no transmission expert but the benefit of running an 18 speed is you have 300 RPM between shifts. It gives you the ability to run at a more constant RPM. Just a thought!

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  10. #8
    Road Train Member Cowpie1's Avatar
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    Quote Originally Posted by JohnP3 View Post
    I am no transmission expert but the benefit of running an 18 speed is you have 300 RPM between shifts. It gives you the ability to run at a more constant RPM. Just a thought!
    True, but you get that with a 13 on the top side. The low side has a small spread anyway so there is no reason to go with a heavier 18 unless you are doing specialty work. The only larger split you have is between 5th and 6th going from low range to high.

    The truck listing showed 3.42 rears. I have that ratio in my truck now and have a love/hate relationship with it. In most cases, it is a fine ratio. But overall, based on my loads and runs, I would be much happier with 3.55 or 3.58. I usually have to split down to 12 with the 3.42 rears to keep from lugging once I run below 60mph. With 3.42, 1400 rpm will put you right on 65 mph, 1300 gives you 60 mph, give or take depending on the tires. 1400 in 12th will give you 55 mph. That is also is with a .73 final ratio in my 13 spd. In 12th, I have .86 ratio, direct in 11th.

    Overall, I usually average around 7 mpg year round, a little less in winter, more in summer. Generally running average of 70,000 lb and doing a high percentage of two lane, rolling hill roads.

    That '06 is spec'd pretty well for general freight. You should be able to negotiate the price down somewhat. On the surface, seems like a decent working truck. But, like most things nowadays, it needs to be researched out well to reduce the risk of getting a lemon.
    Last edited by Cowpie1; 05.13.2010 at 10.12 PM.