About this Fuel Economy Converter
Fuel Economy Converter handles the inverse relationships between common vehicle fuel-consumption and fuel-economy units.
Formula or method
Conversions pass through liters per 100 km using standard US and imperial gallon definitions.
Example
About 7.84 L/100 km is approximately 30 US MPG.
Common uses
- Compare US MPG with L/100 km.
- Convert km/L to MPG.
- Understand US versus UK gallon differences.
How to use this tool
- Enter the values or text requested by the calculator.
- Choose units or options when the tool provides them.
- Select the calculation button and review the result.
- Use the formula, example and notes on this page to check whether the result fits your situation.
Important note
L/100 km is consumption, so lower values mean better efficiency; MPG and km/L are economy measures, so higher values mean better efficiency.
Frequently asked questions
Why is MPG conversion not a simple multiplication?
MPG and L/100 km are inverse measures, so the formula includes division.
Are US and UK MPG the same?
No. The imperial gallon is larger than the US gallon, so the same vehicle produces different MPG numbers.