Convert Miles per US Gallon to Imperial Gallons per Mile
Convert Miles per US Gallon (mpg (US)) to Imperial Gallons per Mile (Imp gal/mi) instantly and accurately.
Conversion Formula
Imp gal/mi = 0.8326741846 ÷ mpg (US)
About Miles per US Gallon
Miles per US gallon (mpg(US)) is the US and Canadian standard, displayed on every EPA Monroney sticker and used in CAFE regulations. The US gallon = 3.785411784 L; 1 mile = 1.609344 km. 2026 CAFE passenger car standard: ~49 mpg. Toyota Prius Prime: 52 mpg; Tesla Model 3: 132 MPGe. Historical: Ford Model T 21-25 mpg; 1973 US full-size cars 10-15 mpg. NASCAR at race speed: 4-5 mpg; Class 8 semi: 5-8 mpg. L/100km = 235.21458/mpg(US): 30 mpg = 7.84 L/100km; 50 mpg = 4.71 L/100km.
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.
Quick Reference Table
| Miles per US Gallon (mpg (US)) | Imperial Gallons per Mile (Imp gal/mi) |
|---|---|
| 1 mpg (US) | 0.832674 Imp gal/mi |
| 2 mpg (US) | 0.416337 Imp gal/mi |
| 5 mpg (US) | 0.166535 Imp gal/mi |
| 10 mpg (US) | 0.0832674 Imp gal/mi |
| 25 mpg (US) | 0.033307 Imp gal/mi |
| 50 mpg (US) | 0.0166535 Imp gal/mi |
| 100 mpg (US) | 0.00832674 Imp gal/mi |