Look at a 2018 Kenworth T680. Need some info

Discussion in 'Kenworth Forum' started by calvinbabb, May 16, 2022.

  1. calvinbabb

    calvinbabb Bobtail Member

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    Apr 28, 2016
    Trenton, Fl.
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    The truck has a little over 500k miles. Seems to be well maintained. My question is, what kinda mileage should I expect? Has isx15 set at 450, the trans is a FAOM15810C-EA3 10 speed auto, and the rears are 2.64 ratio. This will be my first auto shift. Mixed emotions on that part. Trading in my 579 with paccar engine cause I’m tire of the issues. Mileage is my biggest concern. I got over 7 sometimes 8 mpg with the paccar. Hoping with a 2.64 gear it’s tall enough to sip fuel but still run decent on hills. I usually only run about 68 mph out of habit and normally gross about 62k.
     
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  3. Eddiec

    Eddiec Road Train Member

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    2,056
    Feb 2, 2015
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    Get a download of the ECM and do a Rig Dig report. Does the seller have the maintenance history of the truck?
     
  4. zodiacflyer

    zodiacflyer Light Load Member

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    Aug 25, 2014
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    If you are primarily concerned with economy, spec for economy and don't worry about the hills so much. Unless you run in the mountains all the time, a little lost speed going up isn't going to kill you near as bad as getting ####ty fuel economy the rest of the the time. .

    As far as that truck goes, the only things I would worry about are the ISX camshaft issues, and they have a tendency to develop asphaltenes in the unnecessarily complicated fuel system.
     
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