Fuel Economy Converter
Convert between MPG, L/100km, and other fuel economy units
Fuel Economy Converter
Enter a positive number
Select the input unit type
Conversion Results
Conversion Formulas
Common Fuel Economy Conversions
| US MPG | UK MPG | L/100km | km/L | Rating |
|---|---|---|---|---|
| 50 | 60.1 | 4.7 | 21.3 | Excellent |
| 40 | 48.0 | 5.9 | 17.0 | Excellent |
| 35 | 42.0 | 6.7 | 14.9 | Very Good |
| 30 | 36.0 | 7.8 | 12.8 | Good |
| 25 | 30.0 | 9.4 | 10.6 | Average |
| 20 | 24.0 | 11.8 | 8.5 | Below Average |
| 15 | 18.0 | 15.7 | 6.4 | Poor |
Improve Fuel Economy
Optimal Speed
Drive at 60-65 mph (95-100 km/h)
Tire Pressure
Keep tires properly inflated
Use A/C
Above 50 mph, A/C beats open windows
Maintenance
Regular tune-ups and oil changes
Unit Systems
US & Imperial MPG
Higher = Better efficiency
Used in US, UK, Canada
L/100km
Lower = Better efficiency
Used globally (metric)
km/L
Higher = Better efficiency
Common in Asia
Quick Reference
Understanding Fuel Economy
What is Fuel Economy?
Fuel economy measures the relationship between the distance a vehicle travels and the amount of fuel it consumes. Better fuel economy means traveling farther while using less fuel, resulting in lower operating costs and reduced environmental impact.
Unit Systems Explained
- •MPG (Miles per Gallon): Distance traveled per unit of fuel
- •L/100km: Fuel consumed per 100 kilometers traveled
- •km/L: Distance traveled per liter of fuel
Key Differences
US vs UK Gallons
US gallon = 3.785 liters
UK (Imperial) gallon = 4.546 liters
This means UK MPG values are about 20% higher than US MPG for the same efficiency.
Interpretation
Higher is better: MPG, km/L
Lower is better: L/100km
These systems are inversely proportional to each other.
Real-World Example
A car getting 30 US MPG equals:
• 36 UK MPG
• 7.8 L/100km
• 12.8 km/L