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Making Sense of Fuel Economy Conversions

Understanding fuel economy is essential—whether you’re planning an international road trip, comparing vehicles, or simply trying to save at the pump. But depending on where you are in the world, fuel efficiency can be measured in very different ways.

Common Units of Fuel Economy

Unit	Description	Region Used
MPG (US)	Miles per gallon	United States
MPG (UK)	Miles per imperial gallon	United Kingdom
L/100 km	Liters per 100 kilometers	Most of Europe, Asia
km/L	Kilometers per liter	Japan, India

💡 Note: MPG and L/100km measure opposite things. MPG tells you how far you can go per unit of fuel, while L/100km tells you how much fuel you need to go a certain distance.

Conversion Made Easy

Here’s how the most common fuel economy conversions work:

• L/100 km to MPG (US):
  $$ \text{MPG} = \frac{235.215}{\text{L/100 km}} $$
• MPG (US) to L/100 km:
  $$ \text{L/100 km} = \frac{235.215}{\text{MPG}} $$
• km/L to MPG (US):
  $$ \text{MPG} = \text{km/L} \times 2.352 $$
• MPG (US) to km/L:
  $$ \text{km/L} = \text{MPG} / 2.352 $$

Example:
If your car averages 7.5 L/100 km, that’s approximately 31.36 MPG (US).

Who It Matters To

Fuel economy conversions help:

• Travelers that rent cars or plan routes internationally
• Eco-conscious drivers like to compare vehicle efficiency
• Budgeters always look to track fuel costs accurately
• Auto enthusiasts tend to review cars across global standards

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