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Fuel Economy Guide: MPG, L/100km & km/L

Compare car fuel efficiency across US MPG, European L/100km, and metric km/L ratings.

Introduction

Fuel economy measures how efficiently a vehicle uses fuel. The US uses MPG (higher is better), Europe uses L/100km (lower is better), and some Asian markets use km/L (higher is better). Our Fuel Economy Converter handles all three.

Understanding the Units

  • MPG (US): Miles per US gallon — distance per volume
  • L/100km: Liters per 100 km — volume per distance (inverse)
  • km/L: Kilometers per liter — distance per volume

Key Conversions

  • MPG (US) to L/100km: 235.215 ÷ MPG
  • L/100km to MPG (US): 235.215 ÷ L/100km
  • 30 MPG (US) ≈ 7.84 L/100km
  • 50 MPG (US) ≈ 4.7 L/100km

Comparing Cars Across Regions

A European car rated 5.5 L/100km converts to about 43 MPG (US) — excellent efficiency. Always check whether MPG is US or UK (imperial gallon is larger).

Conclusion

Compare vehicles fairly with our MPG to L/100km, L/100km to MPG, and fuel economy converter hub.

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Fuel Economy Guide: MPG, L/100km & km/L | ConvertRubix