Fuel Economy Converter Online
Free online fuel economy converter. Convert between miles per gallon (MPG), kilometers per liter (km/L), and liters per 100 km (L/100km). Instant results.
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Tip: Click any row to copy · Note: L/100km is inverse (lower = more efficient)
💡 Definition
Fuel Economy Converter
- Fuel economy measures how far a vehicle travels per unit of fuel.
- The US uses miles per gallon (MPG), Europe uses liters per 100 km (L/100km), and some countries use km per liter.
- Note: higher MPG or km/L means better efficiency, while lower L/100km means better efficiency.
📖 How to use
Step by Step
- Enter a fuel economy value and choose your source unit from the Convert From dropdown
- All equivalent values appear instantly in the results grid
- The source unit row is highlighted in purple for clarity
- Remember: L/100km is an inverse scale — lower is more efficient
🎯 Use cases
When to use
- Comparing vehicle fuel efficiency across markets
- Converting rental car specs when traveling abroad
- Calculating fuel costs for road trips
- Comparing hybrid, EV, and ICE vehicle efficiency
Frequently Asked Questions
How do you convert MPG to L/100km?▾
Divide 235.215 by the MPG value. For example, 30 MPG = 235.215 ÷ 30 ≈ 7.84 L/100km. The relationship is inverse — higher MPG means lower L/100km.
What is good fuel economy?▾
In the US, average new-car fuel economy is about 25-30 MPG (7.8-9.4 L/100km). Hybrids typically achieve 45-55 MPG (4.3-5.2 L/100km). Electric vehicles are rated in MPGe.
What is the difference between US and Imperial MPG?▾
US MPG uses the US gallon (3.785 L), while Imperial MPG uses the Imperial gallon (4.546 L). So Imperial MPG values are about 20% higher for the same vehicle. A car rated 30 US MPG would be about 36 Imperial MPG.