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T880 with bad mpg.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by J Rich, May 28, 2018.

Page 2 of 2
  1. May 29, 2018 #11
    Ridgeline

    Ridgeline Road Train Member

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    My point is your gearing may be all wrong for the job. I've got HH trucks that get better mileage than that pulling 80k.
     
    Ridgeline, May 29, 2018
    Ridgeline, May 29, 2018
    #11
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  3. May 29, 2018 #12
    Lyle H

    Lyle H Road Train Member

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    Maybe not dragging that pickup with you might help
     
    Lyle H, May 29, 2018
    Lyle H, May 29, 2018
    #12
    J Rich Thanks this.
  4. May 29, 2018 #13
    J Rich

    J Rich Medium Load Member

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    May 28, 2018
    Atlanta Ga
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    Turning about 1600 - 1700 rpm at 75 mph. 9th gear finishes out about 60 mph. Keep in mind we're not coast to coast haulers. We do a lot for back roads and mountains in the southeast.
     
    J Rich, May 29, 2018
    J Rich, May 29, 2018
    #13
  5. May 29, 2018 #14
    uncleal13

    uncleal13 Road Train Member

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    Those trailers are just open up top, right?
    I have hopper bottom trailers, if I drive down the highway without the tarps closed, I can feel the effect of the air dragging in there like a parachute.
    Problem a half mile per gallon there, plus the truck should be a mid roof to match the height of the trailer. Another couple of points there.
     
    uncleal13, May 29, 2018
    uncleal13, May 29, 2018
    #14
  7. May 29, 2018 #15
    uncleal13

    uncleal13 Road Train Member

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    If you are running 75 mph a lot, that will hurt mpg too.
     
    uncleal13, May 29, 2018
    uncleal13, May 29, 2018
    #15
  8. May 29, 2018 #16
    J Rich

    J Rich Medium Load Member

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    May 28, 2018
    Atlanta Ga
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    Keep in mind we are comparing the two trucks. Same gearing, trans, tires, trailer, driver, driving style, load, route. The newer truck get almost 1mpg less than the other 3.8 mpg
     
    J Rich, May 29, 2018
    J Rich, May 29, 2018
    #16
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