4 units
Fuel Economy Converter
Fuel economy is non-linear: mpg and L/100km are inversely proportional. A higher mpg means lower L/100km.
Popular fuel economy conversions
Common fuel economy conversions
| From | Equivalent |
|---|---|
| 1 L/100km | 235.2146 mpg (US) · 282.4809 mpg (UK) · 100 km/L |
| 5 L/100km | 47.0429 mpg (US) · 56.4962 mpg (UK) · 20 km/L |
| 10 L/100km | 23.5215 mpg (US) · 28.2481 mpg (UK) · 10 km/L |
| 100 L/100km | 2.3521 mpg (US) · 2.8248 mpg (UK) · 1 km/L |
| 1000 L/100km | 0.2352 mpg (US) · 0.2825 mpg (UK) · 0.1 km/L |
How the conversion works
Inverse relationship: `L/100km = 235.21 / mpg (US)` and `L/100km = 282.48 / mpg (UK)`. `km/L = 100 / L/100km`.
When you'll use this converter
- Comparing car efficiency across regions (US vs Europe)
- Trip cost estimation
- Vehicle reviews and spec comparisons
Frequently asked
Why is mpg not just a linear conversion?
Because mpg is distance per fuel, while L/100km is fuel per distance — they are reciprocals of each other after unit conversion.
Is 30 mpg good?
30 mpg (US) ≈ 7.84 L/100km — middling for a modern petrol car. Hybrids commonly hit 40–55 mpg (4.3–5.9 L/100km).