Convert US Gallons per Mile to Miles per Imperial Gallon
Convert US Gallons per Mile (US gal/mi) to Miles per Imperial Gallon (mpg (Imp)) instantly and accurately.
Conversion Formula
mpg (Imp) = 1.200949926 ÷ US gal/mi
About US Gallons per Mile
US gallons per mile is for extreme consumption: 1 US gal/mi = 235.215 L/100km. Only tanks, heavy mining equipment, or large ships fall into even the fractional gal/mi range. A Boeing 787 burns ~3.9 US gal/mi total (0.015 gal/mi per seat at 85% load factor, 257 seats). Commercial aircraft fleet-wide emission intensity is sometimes expressed in gal/mi per departure. Oceangoing vessels historically logged fuel in US gal/mi in American regulatory frameworks. 1 US gal/mi = 235.215 L/100km = 1 mpg(US) ÷ 100.
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
| US Gallons per Mile (US gal/mi) | Miles per Imperial Gallon (mpg (Imp)) |
|---|---|
| 1 US gal/mi | 1.20095 mpg (Imp) |
| 2 US gal/mi | 0.600475 mpg (Imp) |
| 5 US gal/mi | 0.24019 mpg (Imp) |
| 10 US gal/mi | 0.120095 mpg (Imp) |
| 25 US gal/mi | 0.048038 mpg (Imp) |
| 50 US gal/mi | 0.024019 mpg (Imp) |
| 100 US gal/mi | 0.0120095 mpg (Imp) |