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Hi, there!

When we describe the fuel consumption, how should we pronounce the '/100km'?

e.g: This car has a fuel consumption of 100 gal/100km.

Is it pronounced as 'per one hundred kilometers' or 'per hundred kilometers'? Or do we say 'every hundred kilometers'? Or any other solutions?

I appreciate any suggestions. Thank you a lot!


I've read all the comments, and thank you for your detailed answers.

I searched for some materials and found that there are varies ways to express fuel consumption:

  1. Miles Driven divided by Amount of Gas Used:
    • Units:
      1. Miles per gallon (mpg, mi/gal, MPG, used in the U.S.A and the U.K.)
      2. Kilometer per liter (km/L)
  2. Amount of Gas Used divided by Miles Driven:
    • Units:
      1. Liters per 100 kilometers (L/100km)
      2. Liters per mile (L/mi, used in Norway and Sweden)

Thank you all again for all the comments!

  • 2
    Any of the above. – Hot Licks Jul 7 at 12:07
  • Wikipedia has: 'The slash in derived units such as m/s (meters per second) is not an abbreviation slash, but a straight division.' The expansion almost certainly licenses one way of pronouncing this, and it's the one I've always used. – Edwin Ashworth Jul 7 at 12:25
  • That doesn't make any sense whatsoever. If it costs you a hundred gallons of fuel to drive barely sixty miles and change, you'd go broke before you got anywhere. – tchrist Jul 7 at 13:35
  • 1
    Nah, what doesn't make sense is to mix up gallons and kilometers in a European-style expression of fuel economy. – choster Jul 7 at 16:27
  • 2
    @David What I mean is that expressing fuel economy as consumption per fixed distance traveled is European (and antipodean; typically L/100km). In the US, much of Asia, and Latin America, it is given as distance per unit of fuel consumed by volume (in the US typically mi/gal, usually abbreviated as MPG, elsewhere km/L). – choster Jul 7 at 20:19

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