Convert Miles per Imperial Gallon to Liters per Nautical Mile
Convert Miles per Imperial Gallon (mpg (Imp)) to Liters per Nautical Mile (L/nmi) instantly and accurately.
Conversion Formula
L/nmi = 5.231546941 ÷ mpg (Imp)
About Miles per Imperial Gallon
Miles per Imperial gallon (mpg(Imp)) is the UK and historically Commonwealth standard. The Imperial gallon (4.54609 L) is ~20.1% larger than the US gallon, so mpg(Imp) is always numerically higher: a 7 L/100km car achieves 33.6 mpg(US) but 40.4 mpg(Imp). All UK VCA-certified specs list mpg(Imp). Typical WLTP combined: supermini 45-60 mpg; full hybrid 55-75 mpg; diesel family car 48-68 mpg; large petrol SUV 28-38 mpg. 1 mpg(Imp) = 1.609344/4.54609 km/L = 0.354006 km/L; L/100km = 282.481/mpg(Imp).
About Liters per Nautical Mile
Liters per nautical mile (L/nmi) is the maritime fuel consumption unit. One nautical mile = 1.852 km exactly (one arcminute of latitude). A large container ship (400 m, 200,000 DWT) at 18 knots consumes 50,000-100,000 L/nmi of heavy fuel oil; a RoPax ferry 800-3,000 L/nmi; a RIB patrol boat at 25 knots 30-80 L/nmi. Slow-steaming reduces L/nmi by 30-40% due to the cubic drag-speed relationship. Bunker cost per nmi = L/nmi × fuel price/litre. 1 L/nmi = 100/1.852 ≈ 53.996 L/100km.
Quick Reference Table
| Miles per Imperial Gallon (mpg (Imp)) | Liters per Nautical Mile (L/nmi) |
|---|---|
| 1 mpg (Imp) | 5.23155 L/nmi |
| 2 mpg (Imp) | 2.61577 L/nmi |
| 5 mpg (Imp) | 1.04631 L/nmi |
| 10 mpg (Imp) | 0.523155 L/nmi |
| 25 mpg (Imp) | 0.209262 L/nmi |
| 50 mpg (Imp) | 0.104631 L/nmi |
| 100 mpg (Imp) | 0.0523155 L/nmi |