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Math Help - miles per gallon

  1. #1
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    miles per gallon

    I think that the rev counter on cars could be replaced by a counter that shows the current fuel efficiency.
    This would be simple to do but what I wonder would be the formula for calculating it if you couldn't just measure the fuel intake against the speed.
    What formula would apply then?
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  2. #2
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    This was common in New Zealand/Australia on Holdens (General Motors) and on Fords (late 1970's). If I remember correctly the guage was not calibrated and was marked somtheing like "Econo-guage". I believe that it was actualy a vacuum guage connected to the engine inlet manifold (or was that exhaust?).

    Now my Ford Falcon (1997) displays this information on a digital display measured in litres per 100 kilometers. I don't know how they calculate it, but would not be at all surprised if it is just an estimate based on the inlet manifold vacuum.
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  3. #3
    MHF Contributor

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    It certainy should not be difficult to have a meter on the fuel feed that measures, say, L litres per hour. With the speedometer that measures K km per hour, km per litre would just K/L.
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