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How to use
This converter normalizes the common ways of expressing fuel economy and consumption: US MPG, Imperial MPG, L/100km, km/L and mi/L. It keeps US and Imperial gallons separate and correctly handles the reciprocal relationship between fuel-per-distance and distance-per-fuel units.
- Enter a positive value and choose the unit shown by the vehicle specification or trip display.
- Calculate; Mihsaba converts through km/L and returns every supported unit.
- Compare the outputs knowing that lower L/100km is better while higher MPG and km/L are better.
How it is calculated
Example
30 US MPG ≈ 12.7543 km/L ≈ 7.8405 L/100km. The same physical economy is about 36.028 Imperial MPG because the Imperial gallon is larger.
Important notes
The converter uses 1 mile = 1.609344 km, US gallon = 3.785411784 L and Imperial gallon = 4.54609 L. It converts a stated figure; it does not predict real-world vehicle consumption, which varies with conditions, load and driving style.
Worked examples and interpreting results
Fuel economy of 20 km/L means consumption of 5 L/100 km. At 10 km/L, consumption is 10 L/100 km. The two measures have an inverse relationship.
| Case | Calculation | Result |
|---|---|---|
| 20 km/L to L/100 km | 100 ÷ 20 | 5 L/100 km |
| 10 km/L to L/100 km | 100 ÷ 10 | 10 L/100 km |
How to check the result
Higher km/L and lower L/100 km mean less fuel for the same distance. Select the correct gallon type for MPG. This is a unit comparison, not a prediction for driving under different conditions.
Frequently asked questions
Why is 30 US MPG not 30 Imperial MPG?
Because the gallon sizes differ; an Imperial gallon is larger than a US gallon.
Why does L/100km move in the opposite direction?
It measures fuel used over a fixed distance, so lower values mean less fuel consumption.
Can I convert zero L/100km?
No. Zero makes the reciprocal distance-per-fuel value unbounded, so this converter requires a positive input.