Convert L 100km to Mpg
| L 100km (l-100km) | Mpg (mpg) |
|---|---|
| 10 | — |
| 15 | — |
| 20 | — |
| 25 | — |
| 30 | — |
| 35 | — |
| 40 | — |
| 45 | — |
| 50 | — |
| 60 | — |
How to Convert L 100km to Mpg
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 L 100km to Mpg?
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.