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12.7 Detroit VS DD13/15 mpg

Discussion in 'Experienced Truckers' Advice' started by Jasonar15, Jan 4, 2020.

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  1. Jan 4, 2020 #1
    Jasonar15

    Jasonar15 Medium Load Member

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    Looking at some advice on mpg between 12.7 and the newer dd13/15. The reason I’m asking is I have 3 12.7 Detroit’s in western stars and fld120s, and a 3406B cat in 94 Pete 379. Would the mpg increase if I got a newer cascadia with a dd13/15 over the 12.7? Used trucks are going at good prices right now with the low rates. I run flatbed. Any insight would be appreciated.
     
    Jasonar15, Jan 4, 2020
    Jasonar15, Jan 4, 2020
    #1
    jamespmack Thanks this.
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  3. Jan 4, 2020 #2
    tnevin225

    tnevin225 Road Train Member

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    What kind of fuel mileage do you get now?
     
    tnevin225, Jan 4, 2020
    tnevin225, Jan 4, 2020
    #2
    jamespmack Thanks this.
  4. Jan 4, 2020 #3
    jamespmack

    jamespmack Road Train Member

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    I would like honest mpg to the dd13/15 too. I'm running a DDEC4 12.7l too.

    What type of trailers and terrain are you running?
     
    jamespmack, Jan 4, 2020
    jamespmack, Jan 4, 2020
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    Ten Bears19 Thanks this.
  5. Jan 4, 2020 #4
    Jasonar15

    Jasonar15 Medium Load Member

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    Flatbed, run southeast and touch MD and PA some
     
    Jasonar15, Jan 4, 2020
    Jasonar15, Jan 4, 2020
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    jamespmack Thanks this.
  7. Jan 4, 2020 #5
    jamespmack

    jamespmack Road Train Member

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    Well. I can say I stay mostly Ohio, Michigan, Indiana.

    Flatbed with sidekit, flat skateboard, hopper bottom, and dry van. 5.3 to 8.5. Yearly average 6-6.5 average all miles. All hand calculated.
     
    jamespmack, Jan 4, 2020
    jamespmack, Jan 4, 2020
    #5
    Ten Bears19, alds and Bean Jr. Thank this.
  8. Jan 4, 2020 #6
    sbaumann14

    sbaumann14 Road Train Member

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    I have an 03 DDEC 4 in an fld. I run a step. My bud has a 19 cascadia with the dd15, and a 12 speed running a flat. He CONSISTENTLY gets 7.5 at 67-70 mph. When he drops it down to 62, he gets 8 1\2 to 9. On a run he did out to Seattle, he was doing 58-60 mph and getting 9 1/2. I get 6 at 64 mph. So, for every 100k miles, if he does 8 mpg, he will save 4100 gallons per that time over me. At $2.5 per, thats over $10k.
    He belongs to a facebook group called Freightliner Team Run Smart. Look it up. Im selling my FLD this spring
     
    Last edited: Jan 4, 2020
    sbaumann14, Jan 4, 2020
    sbaumann14, Jan 4, 2020
    #6
  9. Jan 4, 2020 #7
    DUNE-T

    DUNE-T Road Train Member

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    I say you will not get any noticeable mpg improvement, but you will start hating the day you sold your old trucks after that D13/D15 start having problems
     
    DUNE-T, Jan 4, 2020
    DUNE-T, Jan 4, 2020
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  10. Jan 4, 2020 #8
    sbaumann14

    sbaumann14 Road Train Member

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    Also look up 9+ mpg group on Facebook
     
    sbaumann14, Jan 4, 2020
    sbaumann14, Jan 4, 2020
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    jamespmack Thanks this.
  11. Jan 4, 2020 #9
    Jasonar15

    Jasonar15 Medium Load Member

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    I’m not going to sell any of the old trucks. They all still run good. Just thinking if I add a truck and go newer to increase the mpg to save fuel cost.
    With that said my thinking is older truck you start replacing things here and there as they wear out, less mpg and so on. Never truck maybe half the mileage on it or more, better mpg, drivers like newer trucks, most don’t like to change gears, etc
     
    Jasonar15, Jan 4, 2020
    Jasonar15, Jan 4, 2020
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    jamespmack Thanks this.
  12. Jan 4, 2020 #10
    jamespmack

    jamespmack Road Train Member

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    What the Detroit rep I heard bragging about 600k overhauls. Didnt mention not many guys have rebuildable blocks at that time however.
     
    jamespmack, Jan 4, 2020
    jamespmack, Jan 4, 2020
    #10
    Ten Bears19 Thanks this.
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