Convert Miles per US Gallon to Imperial Gallons per 100 Miles
Convert Miles per US Gallon (mpg (US)) to Imperial Gallons per 100 Miles (Imp gal/100mi) instantly and accurately.
Conversion Formula
Imp gal/100mi = 83.26741846 รท 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 100 Miles
Imperial gallons per 100 miles is the British volumetric consumption equivalent using the Imperial gallon (4.54609 L). Since the Imperial gallon is ~20.1% larger than the US gallon, a vehicle's Imp gal/100mi is correspondingly smaller than its US gal/100mi. A car at 7 L/100km needs 2.977 US gal/100mi but only 2.478 Imp gal/100mi. The unit appears in UK fleet management software and automotive engineering reports. A 50 mpg(Imp) car uses 2 Imp gal/100mi = 5.650 L/100km. 1 Imp gal/100mi = 4.54609/1.609344 = 2.8248 L/100km.
Quick Reference Table
| Miles per US Gallon (mpg (US)) | Imperial Gallons per 100 Miles (Imp gal/100mi) |
|---|---|
| 1 mpg (US) | 83.2674 Imp gal/100mi |
| 2 mpg (US) | 41.6337 Imp gal/100mi |
| 5 mpg (US) | 16.6535 Imp gal/100mi |
| 10 mpg (US) | 8.32674 Imp gal/100mi |
| 25 mpg (US) | 3.3307 Imp gal/100mi |
| 50 mpg (US) | 1.66535 Imp gal/100mi |
| 100 mpg (US) | 0.832674 Imp gal/100mi |