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Before you buy newer; the mpg isn't there.

Discussion in 'Ask An Owner Operator' started by IH Branded, Jun 20, 2017.

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  1. Jun 20, 2017 #1
    IH Branded

    IH Branded Medium Load Member

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    Jun 4, 2013
    Great Lakes area
    0
    Bought a Kenworth T660 Cummins, 13 speed, 3.55 on a lease return. 350,000 miles.

    I've been at it long enough to not "bank" on anything but I guess I did figure it would be a little better.

    We pull tanker with fairly short hauls. Lots of 50-100 mile hauls and some up to 250. At first we were in the 5.9 - 6.9 range and now we are down to 6.1 over the last month. Yes we have to idle/pto some loads on and off. Came with new virgin big ugly lug Yokohoma tires which I don't think helps. Yes check engine light came on a couple weeks ago and shop said a couple oxygen sensors are failing or something.
    One thing that did amaze me is the mpg readout on the dash is dead on with the pumped gallons and miles ran.

    Heck my Cat C15 with close to a million on it averages 6.0 and it never has a check engine light on.

    Yes I knew this would happen. But figured it would be 6.5 -7.

    Just wanted to make sure the younger leaner bank accounts were aware.
     
    IH Branded, Jun 20, 2017
    IH Branded, Jun 20, 2017
    #1
    Lone Ranger 13, insertnamehere and Crazy Alex Thank this.
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  3. Jun 20, 2017 #2
    kimbosa

    kimbosa Medium Load Member

    524
    351
    Jul 4, 2011
    lufkin texas
    0
    I drive a 2013 660 kenworth and the engine light a many others come on. And nothing. All the time this thing is gonna blow. But no it just keeps on ticking, shop says it just a lying computer!
     
    kimbosa, Jun 20, 2017
    kimbosa, Jun 20, 2017
    #2
  4. Jun 20, 2017 #3
    gentleroger

    gentleroger Road Train Member

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    Jun 1, 2010
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    If you've got bad oxygen sensors or Def issues your fuel economy will suck. I would expect things to go up once you have the sensors working right(ish)
     
    gentleroger, Jun 20, 2017
    gentleroger, Jun 20, 2017
    #3
    PhilKenSebben Thanks this.
  5. Jun 21, 2017 #4
    PhilKenSebben

    PhilKenSebben Light Load Member

    119
    221
    Aug 23, 2008
    Ocala, FL
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    Just like in cars, bad 02 sensors make the computer use more fuel to compensate for the "lack" of oxygen. Should see a bump in economy if you replace them.
     
    PhilKenSebben, Jun 21, 2017
    PhilKenSebben, Jun 21, 2017
    #4
  7. Jun 21, 2017 #5
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

    7,274
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    Jan 20, 2010
    Hesperia, Ca.
    0
    My 3406E Cat is averaging 7.0 mpg with the aftermarket DPF retrofit.
     
    Diesel Dave, Jun 21, 2017
    Diesel Dave, Jun 21, 2017
    #5
    flatbeb mac Thanks this.
  8. Jun 21, 2017 #6
    Ridgeline

    Ridgeline Road Train Member

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    Michigan
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    Trucks don't have o2 sensors.
     
    Ridgeline, Jun 21, 2017
    Ridgeline, Jun 21, 2017
    #6
    cnsper, insertnamehere, TROOPER to TRUCKER and 1 other person Thank this.
  9. Jun 21, 2017 #7
    boneebone

    boneebone Road Train Member

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    Mar 13, 2009
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    My N14 Celect+ with Aftermarket DPF still averages 7.5 mpg with Bridgestone M726EL Lug Tires, which is the same MPG before I had the Aftermarket DPF installed.

    These new Post Emissions trucks with all their computers and sensors are worthless Money Pits.
     
    Last edited: Jun 21, 2017
    boneebone, Jun 21, 2017
    boneebone, Jun 21, 2017
    #7
    Diesel Dave Thanks this.
  10. Jun 21, 2017 #8
    Kenworth 4life

    Kenworth 4life Medium Load Member

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    Feb 16, 2017
    Augusta, Maine
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    Lol I have a few trucks my newest being a 15 kw glider with a 60series Detroit it gets around 7ish the 05 with the same engine gets the same! The 86 with a 3406B cat gets 6- 6.5 . All them fancy computers that optimizes fuel economy is b.s. My old 86 is mechanical and gets almost the same as the newer one!!
     
    Kenworth 4life, Jun 21, 2017
    Kenworth 4life, Jun 21, 2017
    #8
    insertnamehere, Tug Toy, bowhunter67 and 1 other person Thank this.
  11. Jun 21, 2017 #9
    Brettj3876

    Brettj3876 Road Train Member

    11,257
    54,039
    Nov 18, 2014
    Land of local
    0
    Out of all the trucks my dad has driven his old 9670 intl with a big cam has done the best. Almost 7.0 mpg for a span of a million miles running 1850 rpm @60MPH.

    His 93 mack ch in my avatar is getting 6.5 with small rubber and 3.91s.
     
    Brettj3876, Jun 21, 2017
    Brettj3876, Jun 21, 2017
    #9
  12. Jun 21, 2017 #10
    Roberts450

    Roberts450 Road Train Member

    2,237
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    Feb 6, 2016
    0
    You sure that old IH isnt diesel electric as thats the same RPM gensets run. Lol
     
    Roberts450, Jun 21, 2017
    Roberts450, Jun 21, 2017
    #10
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