MPG (UK) to Km/L
1 mile per gallon (imperial) equals 0.3540061899 kilometers per liter (rounded).
How to convert miles per gallon (imperial) to kilometers per liter
To convert miles per gallon (imperial) to kilometers per liter, multiply the number of miles per gallon (imperial) by 0.3540061899. The factor is rounded to 10 significant digits. To go the other way, multiply kilometers per liter by 2.824809363 (rounded).
kilometers per liter = miles per gallon (imperial) × 0.3540061899
Example: 10 miles per gallon (imperial) = 3.540061899 kilometers per liter.
Miles per gallon rises as a car gets more efficient, while liters per 100 km falls. The conversion between them is a reciprocal (for US mpg: L/100 km = 235.215 ÷ mpg).
About these units
Mile Per Gallon (imperial) (mpg (UK))
Miles traveled on one imperial gallon (4.546 L). The UK still quotes fuel economy this way, so UK mpg figures are about 20% higher than US ones for the same car.
Britain's gallon is a child of the 1824 reform. It was originally defined as the volume of 10 pounds of distilled water at 62 degrees Fahrenheit, taken as 277.274 cubic inches; an 1889 Order in Council changed the figure to 277.463 cubic inches, and in 1976 the UK adopted the metric definition of exactly 4.54609 litres, after Canada had done so. The gallon used in the United States comes from a different, older wine measure, so the two differ by about 20 percent.
One imperial gallon is about 1.2 US gallons, which means that a car rated at 40 mpg in the UK delivers only about 33 mpg on the US scale. Miles per imperial gallon is still the UK's main fuel-economy unit even though petrol is sold by the litre and selling goods by the imperial gallon is no longer legal in Britain. Some Caribbean territories, such as the Cayman Islands and Grenada, still sell petrol by the imperial gallon, while the UAE, Guyana and Myanmar switched to litres in 2010, 2013 and 2014. When a figure says only mpg, check which gallon is meant.
1 mile per gallon (imperial) = 0.3540061899 kilometers per liter (approximately).
Sources: Wikipedia: Imperial gallon; Wikipedia: Fuel economy in automobiles
Kilometer Per Liter (km/L)
Distance traveled on one liter of fuel. The standard way to quote fuel economy in India, Japan, Brazil and much of Asia.
Kilometres per litre is the most literal way to ask how far a car goes on a given amount of fuel. It is a direct measure of fuel economy, so higher is better, and it sits between the two systems that dominate the world: miles per gallon and litres per 100 km. The sources I found do not credit any specific inventor or date for it; it is simply the metric counterpart to miles per gallon, formed by dividing distance by volume in the units a country already used for roads and fuel.
Wikipedia lists India, Japan and South Korea among the places that quote economy in km/L. A conversion shows how it relates to US figures: 1 km/L is about 2.35 mpg (US), so 10 km/L is roughly 23.5 mpg (US), in the same range as the average new US vehicle of the 2020 model year, which was about 25.4 mpg. The Levant has its own variant, kilometres per 20 litres, based on the size of a common fuel container called a tanaka.
The kilometer per liter is the reference unit for fuel economy on this site.
Sources: Wikipedia: Fuel economy in automobiles; Wikipedia: Imperial gallon
Related conversions
- Km/L to MPG (UK) (reverse)
- MPG (UK) to MPG (US)
- MPG (UK) to L/100 km
- MPG (UK) to mi/L
- MPG (UK) to gal/100 mi (US)
- MPG (UK) to gal/100 mi (UK)
- MPG (UK) to L/mil
- MPG (US) to km/L
- L/100 km to km/L
- Mi/L to km/L
- Gal/100 mi (US) to km/L
- Gal/100 mi (UK) to km/L
- L/mil to km/L
See all fuel economy units.