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Fuel Economy Converter

Fuel Economy Converter

Convert between miles per gallon, kilometers per liter, and other fuel economy units
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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

RegionPrimary UnitTypical Range
United StatesMPG (US)20-50
United KingdomMPG (UK)25-60
EuropeL/100km4-8
Japankm/L10-20

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 EconomyEU Standards