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Thread: Ford Fiesta Diesel - Fuel Consumption

  1. #1
    Newbie
    Join Date
    Nov 2013
    Posts
    1

    Smile Ford Fiesta Diesel - Fuel Consumption

    Hi guys,

    My name is Joćo Isaac, i'm from Portugal and i drive a 2013 Ford Fiesta 1.5 TDCI. I have been reading this forum for the last few days but i've only registered today because i've been trying to learn the basics on OBD-II technology.

    My goal as a rookie (a bit of a stretch, maybe...) is to try to match the liters/100km on the trip computer with some calculations i make with the data from the OBD-II.

    I have VCDS installed on my laptop and i can gather some information through the OBD port but not the fuel rate info. What formulas do i have to use to make this calculation? I have info related to RPM, TPS, MAF, MAP, IAT, CLV.

    Can you give me some help me please?

    Thank you guys.

    J. Isaac

  2. #2
    Newbie
    Join Date
    Jan 2014
    Posts
    5
    it took me ages to find this formula

    MPG = vehicle speed/((3600 * MAF)/ (ideal air/fuel ratio * gasoline grams per gallon))
    = (14.7 * 3138 * Speed)/(3600 * MAF)

    Note –
    Speed - Miles/hr
    MAF – grams/s

    Note –
    Speed - Miles/hr
    MAF – grams/s

  3. #3
    Newbie
    Join Date
    Mar 2010
    Posts
    14
    That formula wont work for diesel engines because they dont follow air/fuel ratio rule (diesel are non-stoichiometric)

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