UK mpg to US mpg

How to convert miles per gallon (UK) to miles per gallon (US)

1. Take the value in miles per gallon (UK).
2. Use the formula miles per gallon (US) = miles per gallon (UK) × 0.8326741846.
3. For example, 30 mpg (UK) is 24.98 mpg.

About miles per gallon and miles per gallon

The UK (imperial) gallon is 4.54609 liters and the US gallon is 3.785411784 liters, so a car goes about 20% further on a UK gallon. Multiply UK mpg by 0.832674 to get US mpg. Taking off a sixth is almost exact: 60 UK mpg becomes 50 US mpg against the exact 49.96.

UK car reviews, adverts and owners’ forums quote miles per imperial gallon, while US sites and the EPA use US gallons. Converting is the first step in comparing them, though the official tests differ too, so even converted figures may not line up.

Examples

• 30 mpg (UK) (a large SUV, an illustrative figure) is 24.98 mpg
• 40 mpg (UK) (a family gasoline car, an illustrative figure) is 33.31 mpg
• 55 mpg (UK) (a small diesel, an illustrative figure) is 45.8 mpg
• 70 mpg (UK) (a frugal hybrid, an illustrative figure) is 58.29 mpg

Miles per gallon to miles per gallon chart