Enter your Fuel Economy Value, pick your Convert From and Convert To units, and the Fuel Economy Converter gives you the Converted Value alongside a full breakdown — MPG (US), MPG (UK), L/100km, and km/L — all rounded to your chosen Decimal Places.
Converted Value
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MPG (US)
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MPG (UK)
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L/100km
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km/L
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Fuel economy measures how efficiently a vehicle uses fuel, typically expressed as miles per gallon (MPG) or liters per 100 kilometers (L/100km). Better fuel economy means lower fuel costs and reduced environmental impact.
To convert US MPG to L/100km, divide 235.214583 by the MPG value. For example, 30 MPG = 235.214583 ÷ 30 = 7.84 L/100km. This inverse relationship means higher MPG equals lower L/100km.
US MPG uses US gallons (3.785 liters) while UK MPG uses Imperial gallons (4.546 liters). UK MPG values are about 20% higher than US MPG for the same vehicle due to the larger gallon size.
Good fuel economy varies by vehicle type. For cars, 30+ US MPG (7.8 L/100km or less) is considered good, while 40+ MPG (5.9 L/100km or less) is excellent. SUVs and trucks typically achieve 20-25 MPG.
Maintain proper tire pressure, drive smoothly without rapid acceleration, remove excess weight, keep up with maintenance, use cruise control on highways, and combine trips to reduce cold starts.
Different regions use different measurement systems. The US uses miles and gallons, Europe uses kilometers and liters, while some countries use km/L. Each system reflects local preferences and measurement standards.
Check your vehicle's window sticker, owner's manual, or look up EPA ratings (in the US) or manufacturer specifications online. Real-world fuel economy may vary from official ratings based on driving conditions.