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Thread: First tank of gas in the Diesel

  1. 29th November 2017, 09:28 PM #11
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    LRD414
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    So part way through a tank this is read from the dash, not calculated ?
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  2. 29th November 2017, 09:32 PM #12
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    correct ... no idea how accurate the dash is... +/- 50% probably
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  3. 29th November 2017, 09:35 PM #13
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    First tank of gas in the Diesel

    Anywhere from 10 to 20 percent optimistic with most people around 12-15 percent but there is variation. However no one has ever reported the dash as accurate, been lots of threads on it. Your figures align with most people when corrected for that, as mentioned in earlier posts.

    Scott
    Last edited by LRD414; 30th November 2017 at 06:04 AM.
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  4. 29th November 2017, 09:50 PM #14
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    The fuel usage readout on the dash also appears to be a rolling average (don't know over what interval though), not a reading for that particular tankfull or from last reset.
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  5. 30th November 2017, 04:24 PM #15
    Lukeis
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    So do we believe the odometer then?
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  6. 30th November 2017, 04:43 PM #16
    rocket rod
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    Nope. I did a trip last year and the odo said 9000km, my gps said 8500.
    Rod

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  7. 30th November 2017, 05:07 PM #17
    cruiseh
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    disco.xls

    this is my running sheet. real numbers... we are quite happy with this big old truck
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  8. 30th November 2017, 08:39 PM #18
    Lukeis
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    Wait so if we are saying the fuel consumption is out when going by the cars odometer, and if the odometer is also out then the ‘actual’ fuel consumption will be even worse again?

    i filled up and hit reset on the trip meter today but I have no way of tracking my true distance, also I don’t drive many km’s so this could take a while to report back
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  9. 30th November 2017, 08:48 PM #19
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    Quote Originally Posted by rocket rod View Post
    Nope. I did a trip last year and the odo said 9000km, my gps said 8500.
    Stock size tyres ?, don't think a GPS would account for climbing/descending etc on different terrain.
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  10. 30th November 2017, 09:35 PM #20
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    The odometer is accurate with stock diameter wheels and therefore out by whatever percent increase in circumference is subsequently fitted. I have noted the opposite to Rod on long trips, whereby the odometer slightly undercounts actual distance compared to the signed distances to towns because every wheel revolution is actually further than the odometer calculates (265/60/R18 - 255/55/R19). Highway signs aren’t necessarily 100% accurate but over long enough distances and multiple examples the point can be proven.

    Scott
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