How to convert US mpg to UK mpg
mpg (UK) = mpg (US) × 1.200949926
One US mile per gallon equals 1.200949926 mpg (UK), so multiply the value in US mpg by 1.200949926. Example: 10 mpg (US) = 12.00949926 mpg (UK).
L/100 km is a consumption figure (lower is better) while km/L and mpg are economy figures (higher is better), so the conversion is an inverse, not a simple multiplication. US and UK mpg differ because the gallons differ.
US mpg to UK mpg conversion table
| US mpg (mpg (US)) | UK mpg (mpg (UK)) |
|---|---|
| 1 mpg (US) | 1.200949926 mpg (UK) |
| 2 mpg (US) | 2.401899851 mpg (UK) |
| 3 mpg (US) | 3.602849777 mpg (UK) |
| 5 mpg (US) | 6.004749628 mpg (UK) |
| 10 mpg (US) | 12.00949926 mpg (UK) |
| 15 mpg (US) | 18.01424888 mpg (UK) |
| 20 mpg (US) | 24.01899851 mpg (UK) |
| 25 mpg (US) | 30.02374814 mpg (UK) |
| 50 mpg (US) | 60.04749628 mpg (UK) |
| 75 mpg (US) | 90.07124441 mpg (UK) |
| 100 mpg (US) | 120.0949926 mpg (UK) |
| 250 mpg (US) | 300.2374814 mpg (UK) |
| 500 mpg (US) | 600.4749628 mpg (UK) |
| 1,000 mpg (US) | 1,200.949926 mpg (UK) |