Convert Miles per US Gallon to Miles per Imperial Gallon
Live bidirectional calculator for Miles per US Gallon (US mpg) and Miles per Imperial Gallon (Imperial mpg) with verified formula and conversion charts.
Fuel Consumption4 units
How the Calculation Works (Linear Scaling)
An Imperial gallon (4.54609 L) is approximately 20.095% larger than a US gallon (3.78541 L), so a vehicle travels ~1.201 times more miles per Imperial gallon.
Miles per US Gallon to Miles per Imperial Gallon Conversion Table
Precomputed values for quick reference and printing.
| 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 |
| 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 |
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.
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.
โ Frequently Asked Questions
What is the formula to convert Miles per US Gallon to Miles per Imperial Gallon?
The formula is: Imperial mpg = US mpg ร (4.54609 / 3.785411784) โ US mpg ร 1.20095. An Imperial gallon (4.54609 L) is approximately 20.095% larger than a US gallon (3.78541 L), so a vehicle travels ~1.201 times more miles per Imperial gallon.
How do I convert 1 US mpg to Imperial mpg manually?
To convert 1 US mpg to Imperial mpg: apply the formula Imperial mpg = US mpg ร (4.54609 / 3.785411784) โ US mpg ร 1.20095. Substituting gives: 1 ร 1.20095 = 1.2009 Imperial mpg.