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US MPG to Imperial MPG Converter

Type in either field to convert

A US gallon and an Imperial gallon are not the same size, so a car quoted at 40 MPG in a British review is not as thirsty as a US 40 MPG car. The Imperial gallon used in the UK is about 20 percent larger, which means UK MPG figures are always higher for the same real economy. This converter multiplies US MPG by 1.20095 to get Imperial MPG, and divides to go the other way. Use it when comparing car reviews across the Atlantic, shopping for an import, or reading a spec sheet that does not say which gallon it means. Getting this wrong can make a car look much more or less efficient than it really is. The conversion is exact and runs entirely in your browser with no data sent anywhere.

How to use US MPG to Imperial MPG Converter

  1. Choose the direction, US to Imperial or Imperial to US.
  2. Enter the MPG figure you have.
  3. Read the converted MPG value.

Frequently asked questions

Why do US and Imperial MPG differ for the same car?

An Imperial gallon is about 1.2 times larger than a US gallon, so the same car travels farther per Imperial gallon and reads a higher MPG.

How do I convert US MPG to Imperial MPG?

Multiply US MPG by roughly 1.201 to get Imperial MPG. The tool applies the exact ratio for you.

Can it convert Imperial MPG back to US?

Yes. It converts in both directions between US and Imperial MPG.

What is US MPG to Imperial MPG Converter?

A US gallon and an Imperial gallon are not the same size, so a car quoted at 40 MPG in a British review is not as thirsty as a US 40 MPG car. The Imperial gallon used in the UK is about 20 percent larger, which means UK MPG figures are always higher for the same real economy.

Is US MPG to Imperial MPG Converter free to use?

Yes. US MPG to Imperial MPG Converter is completely free, with no sign-up and no usage limits.

Does US MPG to Imperial MPG Converter work in a web browser?

Yes. US MPG to Imperial MPG Converter runs in any modern web browser. There is nothing to download or install.

Is my data private with US MPG to Imperial MPG Converter?

Yes. US MPG to Imperial MPG Converter runs entirely on your device in your browser, so nothing you enter is uploaded to a server.