Fuel economy MPG ↔ L/100km
L/100km fuel per distance, MPG distance per fuel — reciprocals with constants for gallon size. US 3.785L, UK 4.546L, mile 1.609km → 235.215 US 282.481 UK. Lower L/100 better, higher MPG better.
TL;DR
- L/100km=235.215/MPG_US=282.481/MPG_UK, inverse MPG_US=235.215/L
- Formulas: L/100=235.215/MPG_US=282.481/MPG_UK | MPG_US=235.215/L
- 6L/100
How it works
L/100km=235.215/MPG_US=282.481/MPG_UK, inverse MPG_US=235.215/L. 6L/100 →39.2US 47.1UK.
The math
Constants from gallon+ mile conversion. Same car higher MPG UK due to larger gallon.
Divide not multiply, opposites. 40MPG US→5.88 L/100.
Examples
6L/100
- 39.2 US
- 47.1 UK
40MPG US
- 5.88 L/100
When to use it
✦ Compare stickers
EU vs US.
✦ Buying
Hybrid 4.5L vs SUV 9L.
⚠ Common mistakes
- Mixing US/UK gallons
- Higher L/100 is worse
FAQ (6)
US vs UK MPG?
UK gallon 20% larger, so same car shows ~20% higher MPG UK.
What is good consumption?
Hybrid ~4.5 L/100km (52 MPG US), SUV petrol ~9 L/100km (26 MPG US).
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