Fuel Economy Converter
Convert fuel economy between liters per 100 kilometers and US miles per gallon.
How to Use the Fuel Economy Converter
Enter a positive fuel economy value, choose L/100 km or US MPG as the source unit, select the target unit and convert. The relationship is reciprocal, so the same constant is used in both directions.
Practical Fuel Economy Example
A car rated at 7 L/100 km is approximately 33.60 US MPG because 235.214583 ÷ 7 ≈ 33.60. In the opposite direction, 30 US MPG is approximately 7.84 L/100 km.
Factors That Affect Real Fuel Economy
Driving speed, traffic, acceleration, road gradient, tire pressure, weather, vehicle load, air conditioning and maintenance can all change real-world consumption. The converter changes units only; it does not predict actual fuel usage.
Frequently Asked Questions
Is lower L/100 km better?
Generally yes, because the vehicle uses less fuel to travel 100 kilometers.
Is higher MPG better?
Generally yes, because the vehicle travels farther on one gallon of fuel.
Does this use US or UK gallons?
This converter uses US miles per gallon, not imperial UK MPG.
MPG and L/100 km Are Inverse Measures
Miles per gallon measures distance obtained from a unit of fuel, so a higher value means better fuel economy. Liters per 100 kilometers measures fuel consumed over a fixed distance, so a lower value is better. Because the measures run in opposite directions, converting between them is not a simple multiplication.
US and Imperial Gallons
US gallons and Imperial gallons have different volumes, so MPG values depend on which gallon definition is used. Always choose or verify the correct convention before comparing vehicle specifications from different countries.
Why Real Fuel Economy Varies
Driving speed, traffic, temperature, tire pressure, vehicle load, terrain and driving style can all affect real consumption. A unit conversion changes only the notation; it does not predict actual vehicle efficiency.