Question 1

Why can't this converter use simple multiplication factors?

Accepted Answer

Liters per 100 km is an inverse relationship to the other units — lower L/100km means better efficiency, while higher mpg or km/L means better efficiency. Because it's a reciprocal rather than a proportional relationship, this converter can't use simple proportional factors like most other converters on this site.

Question 2

How many liters per 100 km is 30 mpg (US)?

Accepted Answer

30 mpg (US) ≈ 7.84 liters per 100 km.

Question 3

How is mpg (US) different from mpg (Imperial)?

Accepted Answer

A US gallon (3.785 liters) is smaller than an Imperial gallon (4.546 liters), so the same fuel efficiency expressed in miles per Imperial gallon is a larger number than in miles per US gallon.

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