Convert Miles per Imperial Gallon to Miles per US Gallon
Live bidirectional calculator for Miles per Imperial Gallon (Imperial mpg) and Miles per US Gallon (US mpg) with verified formula and conversion charts.
Fuel Consumption4 units
How the Calculation Works (Linear Scaling)
A US liquid gallon is smaller than an Imperial gallon, yielding ~0.8327 times the miles.
Miles per Imperial Gallon to Miles per US Gallon Conversion Table
Precomputed values for quick reference and printing.
| Miles per Imperial Gallon | Miles per US Gallon |
|---|---|
| 1 Imperial mpg | 0.8327 US mpg |
| 2 Imperial mpg | 1.6653 US mpg |
| 3 Imperial mpg | 2.498 US mpg |
| 4 Imperial mpg | 3.3307 US mpg |
| 5 Imperial mpg | 4.1634 US mpg |
| 6 Imperial mpg | 4.996 US mpg |
| 7 Imperial mpg | 5.8287 US mpg |
| 8 Imperial mpg | 6.6614 US mpg |
| 9 Imperial mpg | 7.4941 US mpg |
| 10 Imperial mpg | 8.3267 US mpg |
| 15 Imperial mpg | 12.4901 US mpg |
| 20 Imperial mpg | 16.6535 US mpg |
| 25 Imperial mpg | 20.8169 US mpg |
| 30 Imperial mpg | 24.9802 US mpg |
| 40 Imperial mpg | 33.307 US mpg |
| 50 Imperial mpg | 41.6337 US mpg |
| 75 Imperial mpg | 62.4506 US mpg |
| 100 Imperial mpg | 83.2674 US mpg |
| Miles per US Gallon | Miles per Imperial Gallon |
|---|---|
| 1 US mpg | 1.2009 Imperial mpg |
| 2 US mpg | 2.4019 Imperial mpg |
| 3 US mpg | 3.6028 Imperial mpg |
| 4 US mpg | 4.8038 Imperial mpg |
| 5 US mpg | 6.0047 Imperial mpg |
| 6 US mpg | 7.2057 Imperial mpg |
| 7 US mpg | 8.4066 Imperial mpg |
| 8 US mpg | 9.6076 Imperial mpg |
| 9 US mpg | 10.8085 Imperial mpg |
| 10 US mpg | 12.0095 Imperial mpg |
| 15 US mpg | 18.0142 Imperial mpg |
| 20 US mpg | 24.019 Imperial mpg |
| 25 US mpg | 30.0237 Imperial mpg |
| 30 US mpg | 36.0285 Imperial mpg |
| 40 US mpg | 48.038 Imperial mpg |
| 50 US mpg | 60.0475 Imperial mpg |
| 75 US mpg | 90.0712 Imperial mpg |
| 100 US mpg | 120.095 Imperial mpg |
About Miles per Imperial Gallon (Imperial mpg)
British imperial fuel economy unit, representing statute miles traveled per Imperial gallon (4.54609 L).
History: Standard British vehicle fuel economy measure before and during UK metrication, still in widespread consumer use.
Common Uses: Vehicle economy marketing and driver trip computers in the United Kingdom and Canada.
About Miles per US Gallon (US mpg)
Standard US customary fuel economy unit, representing statute miles traveled per US liquid gallon (3.785411784 L).
History: Established as mandatory for US EPA fuel economy window stickers under the 1975 Energy Policy and Conservation Act.
Common Uses: EPA window stickers, American automotive ratings, and highway efficiency figures.
โ Frequently Asked Questions
What is the formula to convert Miles per Imperial Gallon to Miles per US Gallon?
The formula is: US mpg = Imperial mpg ร (3.785411784 / 4.54609) โ Imperial mpg ร 0.832674. A US liquid gallon is smaller than an Imperial gallon, yielding ~0.8327 times the miles.
How do I convert 1 Imperial mpg to US mpg manually?
To convert 1 Imperial mpg to US mpg: apply the formula US mpg = Imperial mpg ร (3.785411784 / 4.54609) โ Imperial mpg ร 0.832674. Substituting gives: 1 ร 0.832674 = 0.8327 US mpg.