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  • liter per 100 km to MPG

    Hi, need help with my rusty algebra to come up with a formula for this conversion.

    This is the way gas milerage is rated in Australia, liters per 100km, I can do the math to make the conversion for any amount of liters, but don't have a general formula.

    say a car is rated at 10 liters per 100 km, 10l =10/4=gals, 100 km= 100*.
    6= 60miles, no problem....60/2.5=24MPG is there a simpler way?

    TY

  • #2
    Re: liter per 100 km to MPG

    There is a conversion page available here:
    http://www.onlineconversion.com/fuel_consumption.htm

    Comment


    • #3
      Re: liter per 100 km to MPG

      A simple formula for doing the conversion is:

      US MPG = 235 E
      UK MPG = 282 E


      where E is the rating in liters per 100 kilometers. The MPG formulas are different for the United States and United Kingdom, because the UK gallon of 4.546 liters (also known as the Imperial gallon) is about 20% larger than the US gallon of 3.785 liters.

      Here's a sample calculation. For a fuel efficiency of 9 liters per 100 km, the conversions are--

      US: 235 9 = 26 MPG
      UK: 282 9 = 31 MPG


      Here's a table showing the conversions for a number of different values:
      Code:
                  |     MPG
         L/100 km |   US   UK
       -----------+------------
              4   |   59   71
              6   |   39   47
              8   |   29   35
             10   |   24   28
             12   |   20   24
             14   |   17   20
             16   |   15   18
      If you're interested, this is how the formulas are derived. Let E be the fuel efficiency in liters per 100 kilometers [L/100 km]. Then

      US MPG = 100/E [km/L] x 0.621 [mi/km] x 3.785 [L/US gal] = 235 E
      UK MPG = 100/E [km/L] x 0.621 [mi/km] x 4.546 [L/UK gal] = 282 E

      Comment


      • #4
        Re: liter per 100 km to MPG

        These maths conversions are all well and good, but in Europe the fuel consumption is quoted as urban and extra-urban. These European figures involve a drive around a standard course with stop-starts, accelerations and so on. So they attempt to represent real-life driving.

        Comment


        • #5
          Re: liter per 100 km to MPG

          Originally posted by Tiger View Post
          These maths conversions are all well and good, but in Europe the fuel consumption is quoted as urban and extra-urban. These European figures involve a drive around a standard course with stop-starts, accelerations and so on. So they attempt to represent real-life driving.
          True, and US mileage is quoted as city and highway, with a specific weighted average between them as the composite. The course profile details of US city and EU urban are slightly different so they are not strictly comparable.

          The mathematical conversions above are for units only and assume the same driving profile. Also note the difference in US gallon (3.785411784 L exactly) and UK gallon (4.54609 L) must be considered.

          Comment


          • #6
            Re: liter per 100 km to MPG

            Metric to Imperial. Kms divided by litres X 2.824 will get u really close to mpg imperial.

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            • #7
              Re: liter per 100 km to MPG

              Originally posted by Tim Albers View Post
              Metric to Imperial. Kms divided by litres X 2.824 will get u really close to mpg imperial.
              It will be close, but changing the factor to either 2.8248 or 2.825 will be closer.

              The factor comes from dividing 4.54609 L/Imp. gallon by 1.609344 km/mi (both factors exact). To 7 digits, factor is 2.824 809

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              • #8
                Re: liter per 100 km to MPG

                I know this is an old thread, but the standard formula is "282.48/(litres per 100km)"

                Comment


                • #9
                  Re: liter per 100 km to MPG

                  Originally posted by Unregistered View Post
                  I know this is an old thread, but the standard formula is "282.48/(litres per 100km)"
                  This factor is correct for Imperial gallons. For US gallons use 235.21 instead.

                  Comment


                  • #10
                    Re: liter per 100 km to MPG

                    Originally posted by Tiger View Post
                    These maths conversions are all well and good, but in Europe the fuel consumption is quoted as urban and extra-urban. These European figures involve a drive around a standard course with stop-starts, accelerations and so on. So they attempt to represent real-life driving.
                    True. But a car always drinks more (sometimes up to 50%) in urban drive than on the highway regardless of units you measure fuel efficiency. So this is completely unrelated to the conversion formula.

                    What we have here in datasheets is urban, extra urban and, redundantly, "mixed" which - you guessed it - is always middle spot in between the other two figures. Typically the difference urban / extra-urban is given as 25 - 30% which is generally correct.

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