Fuel Consumption Converter
Convert between 5 fuel economy units — MPG (US), MPG (UK), km/L, L/100km, and gallons per 100 miles. Perfect for comparing vehicle efficiency across different regions.
Quick conversions
All units
About the Fuel Consumption Converter
Fuel consumption (or fuel economy) measures how efficiently a vehicle uses fuel. The US and UK use miles per gallon (MPG), though their gallons differ in size by about 20%, making direct comparison misleading. Europe and most of the world use litres per 100 kilometres (L/100km) — a lower number means better efficiency. km/L is common in South and Southeast Asia.
Quick facts
- ›A US gallon is 3.785 L; a UK gallon is 4.546 L — so UK MPG is always higher for the same vehicle
- ›The average new car sold in the EU achieves about 5–6 L/100km (39–47 MPG US)
- ›Converting 30 MPG (US) gives approximately 12.75 km/L or 7.84 L/100km
- ›Formula 1 cars use about 75 L/100km at race pace — worse than many tractors
Common uses: Automotive, fleet management, travel planning, environmental reporting