Is US MPG the same as UK MPG?

No. A UK gallon is about 20% larger, so 30 MPG (UK) equals about 25 MPG (US). Pick the right unit in the calculator.

How do I convert L/100km to MPG?

MPG (US) = 235.21 ÷ L/100km. MPG (UK) = 282.48 ÷ L/100km.

Why is my real trip cost higher?

Official economy ratings are measured in test cycles. Motorway speed, cold weather, roof boxes and heavy loads usually increase consumption.

Trip Fuel Cost Calculator

Enter the distance, your car's fuel economy and the fuel price. Works with miles or kilometres, MPG (US or UK) or L/100km.

Results

Updates as you type. Nothing you enter leaves your browser.

How the fuel cost is calculated

Fuel used = distance ÷ fuel economy (or distance × L/100km ÷ 100). Fuel cost = fuel used × price per unit. The calculator converts everything to litres internally, so you can mix units – for example a UK car rated in imperial MPG on a trip measured in kilometres.

1 US gallon = 3.785 litres, 1 UK (imperial) gallon = 4.546 litres. That is why the same car shows a higher MPG figure in the UK than in the US.

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FAQ

Is US MPG the same as UK MPG?: No. A UK gallon is about 20% larger, so 30 MPG (UK) equals about 25 MPG (US). Pick the right unit in the calculator.
How do I convert L/100km to MPG?: MPG (US) = 235.21 ÷ L/100km. MPG (UK) = 282.48 ÷ L/100km.
Why is my real trip cost higher?: Official economy ratings are measured in test cycles. Motorway speed, cold weather, roof boxes and heavy loads usually increase consumption.

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