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Is the Qual Comm accurate

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Workinprogress1001, Apr 24, 2013.

  1. Apr 24, 2013 #1
    Workinprogress1001

    Workinprogress1001 Bobtail Member

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    Mar 31, 2013
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    Is the Qual Comm mpg display accurate? I just started using one two weeks ago. The first i pulled mostly lighter loads and it said my average was 6.9-7.9. The next week I pulled heavy loads and the went down to 5.9-6.3. Then I pulled a light weight 4000lbs load and I expected to see mpg go back into the sevens but no it stayed at 6.3.
     
    Last edited: Apr 24, 2013
    Workinprogress1001, Apr 24, 2013
    Workinprogress1001, Apr 24, 2013
    #1
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  3. Apr 24, 2013 #2
    Cowpie1

    Cowpie1 Road Train Member

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    It is only as accurate as the data from your ECM. Which usually, though not always, is off from what mpg actually is pump to pump. It is nice for a general idea of mpg, but the only way to gauge mpg accurately is to divide miles by gallons when you fill up, with a running average over time.
     
    Cowpie1, Apr 24, 2013
    Cowpie1, Apr 24, 2013
    #2
    double yellow and Workinprogress1001 Thank this.
  4. Apr 25, 2013 #3
    v6killer

    v6killer Medium Load Member

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    The QUALCOMM in question resets the average mpg, every 4 to 7 days pending how your safety manager has set it up in their system.
     
    v6killer, Apr 25, 2013
    v6killer, Apr 25, 2013
    #3
    Cowpie1 Thanks this.
  5. Apr 26, 2013 #4
    Cowpie1

    Cowpie1 Road Train Member

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    Yep. Forgot to mention that also. My Qualcomm unit is programmed to reset the mpg on every Friday evening.
     
    Cowpie1, Apr 26, 2013
    Cowpie1, Apr 26, 2013
    #4
  7. Apr 27, 2013 #5
    dwmac71

    dwmac71 Light Load Member

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    Mar 23, 2008
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    Depends if the Qc has the right pulse per mile setting.
    Mine don't and shows higher mpg than my flowscan.
    This week the Qc shows 11mpg were the flowscan shows 7.7.
     
    dwmac71, Apr 27, 2013
    dwmac71, Apr 27, 2013
    #5
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