Convert Imperial Gallons per Mile to Miles per Imperial Gallon
Convert Imperial Gallons per Mile (Imp gal/mi) to Miles per Imperial Gallon (mpg (Imp)) instantly and accurately.
Conversion Formula
mpg (Imp) = 1 ÷ Imp gal/mi
About Imperial Gallons per Mile
Imperial gallons per mile is the British counterpart, using the 4.54609 L Imperial gallon. 1 Imp gal/mi = 4.54609/1.609344 × 100 = 282.481 L/100km - among the largest fuel-consumption values in practical use, representing large vessels and heavy machinery. It appears in older Royal Navy vessel technical logs and historical British railway and steam-locomotive records. As mpg(Imp) and gal/mi are reciprocals, a 50 mpg(Imp) car uses exactly 0.02 Imp gal/mi = 5.650 L/100km. 1 Imp gal/mi = 282.481 L/100km.
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).
Quick Reference Table
| Imperial Gallons per Mile (Imp gal/mi) | Miles per Imperial Gallon (mpg (Imp)) |
|---|---|
| 1 Imp gal/mi | 1 mpg (Imp) |
| 2 Imp gal/mi | 0.5 mpg (Imp) |
| 5 Imp gal/mi | 0.2 mpg (Imp) |
| 10 Imp gal/mi | 0.1 mpg (Imp) |
| 25 Imp gal/mi | 0.04 mpg (Imp) |
| 50 Imp gal/mi | 0.02 mpg (Imp) |
| 100 Imp gal/mi | 0.01 mpg (Imp) |