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Convert between miles per gallon (MPG), liters per 100 kilometers (L/100km), and kilometers per liter (km/L). Compare fuel efficiency across US, UK, and international vehicle ratings — and understand real driving cost differences.
Fuel economy is expressed differently worldwide. The US uses miles per gallon (MPG). Most of the world uses liters per 100 kilometers (L/100km). Some countries use km/L. The UK uses MPG but with the larger Imperial gallon — causing confusion when comparing car specs internationally.
A higher MPG means MORE efficient (more miles per gallon of fuel). A LOWER L/100km means MORE efficient (less fuel per 100 km). They are inversely related: doubling MPG halves L/100km. Formula: L/100km = 235.215 / US MPG.
US gallon = 3.785 liters. UK (Imperial) gallon = 4.546 liters. UK MPG x 0.8327 = US MPG. A car rated 40 UK MPG = 33.3 US MPG = 7.06 L/100km. Never compare UK and US MPG directly without conversion.
| Vehicle Type | MPG (US) | L/100km |
|---|---|---|
| Hybrid sedan | 45-55 | 4.3-5.2 |
| Compact car | 30-40 | 5.9-7.8 |
| Midsize sedan | 25-32 | 7.4-9.4 |
| SUV/Crossover | 20-28 | 8.4-11.8 |
| Full-size truck | 14-20 | 11.8-16.8 |