Convert Mpg to L 100km
| Mpg (mpg) | L 100km (l-100km) |
|---|---|
| 10 | — |
| 15 | — |
| 20 | — |
| 25 | — |
| 30 | — |
| 35 | — |
| 40 | — |
| 45 | — |
| 50 | — |
| 60 | — |
How to Convert Mpg to L 100km
Fuel economy conversion is essential when comparing vehicles across markets. The US uses miles per gallon (mpg), Europe and most of the world use liters per 100 kilometers (L/100km), and some Asian countries use kilometers per liter (km/L). Understanding these conversions helps you compare real-world efficiency.
Conversion Formula
MPG and L/100km are inversely related because one measures distance-per-fuel and the other measures fuel-per-distance. The constant 235.215 comes from converting miles to km (1.60934) and gallons to liters (3.78541): 100 × 3.78541 / 1.60934 ≈ 235.215. For km/L, mpg × 0.425144 works because 1.60934 / 3.78541 ≈ 0.425144.
Step-by-Step Examples
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History
Miles per gallon has been used in the US since the early automotive era. Europe adopted L/100km as the standard in the 1970s during the oil crisis, when fuel efficiency became a major concern. The inverse nature of these units causes frequent confusion — a car improving from 10 to 20 mpg saves more fuel than one improving from 30 to 40 mpg.
Common Use Cases
- Comparing vehicle fuel efficiency across markets
- Calculating fuel costs for road trips
- Understanding car reviews from different countries
- Fleet management and fuel budgeting
- Environmental impact assessment
Frequently Asked Questions
How do I convert Mpg to L 100km?
Use the converter above — fuel economy conversions involve inverse relationships (dividing, not multiplying), so a simple multiplication factor doesn't apply. For example, mpg to L/100km uses the formula: L/100km = 235.215 / mpg.
Why is fuel economy conversion not a simple multiplication?
MPG measures distance per unit of fuel (higher = better), while L/100km measures fuel per unit of distance (lower = better). They are inversely related — doubling your mpg halves your L/100km, not doubles it.
What is the difference between US and UK mpg?
US and UK gallons differ in size. 1 UK gallon = 1.201 US gallons (4.546 L vs 3.785 L). So 30 mpg (UK) ≈ 25 mpg (US). Always check which gallon is being used.
What is a good fuel economy?
In the US, 25-30 mpg is average for a car, 30-40 mpg is good, and 50+ mpg is excellent (typical of hybrids). In metric, 6-8 L/100km is average, 4-6 is good, and under 4 is excellent.