Fuel Economy Converter

Convert MPG, L/100km, km/L and other fuel efficiency units instantly. Compare vehicle fuel consumption across different measurement systems.

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About Fuel Economy Converter

Understanding Fuel Economy

Fuel economy measurements vary significantly across regions, reflecting different historical developments and preferences. The United States and United Kingdom both use miles per gallon (MPG), but their gallons differ in size. Meanwhile, most other countries use metric measurements like liters per 100 kilometers (L/100km) or kilometers per liter (km/L). These differences can make international comparisons challenging and highlight the importance of standardized conversion tools.

Regional Standards

Region	Primary Unit	Typical Range
United States	MPG (US)	20-50
United Kingdom	MPG (UK)	25-60
Europe	L/100km	4-8
Japan	km/L	10-20

Conversion Factors

Volume Conversions

1 US gallon = 3.78541 liters
1 UK gallon = 4.54609 liters
1 UK gallon = 1.20095 US gallons

Distance Conversions

1 mile = 1.60934 kilometers
100 kilometers = 62.1371 miles

Environmental Impact

CO2 Emissions

Gasoline: ~2.3 kg CO2/L
Diesel: ~2.7 kg CO2/L
Better MPG = Lower emissions
EVs: 0 direct emissions

Efficiency Standards

US CAFE standards
EU CO2 regulations
Japan's Top Runner
China's fuel consumption limits

Factors Affecting Fuel Economy

Vehicle Factors

Engine size and efficiency
Vehicle weight
Aerodynamics
Tire pressure
Maintenance condition

External Factors

Driving style
Traffic conditions
Weather and temperature
Road conditions
Altitude

Learn More

US Fuel Economy EU Standards