Gal/100 Mi (UK) to Km/L

1 gallon (imperial) per 100 miles equals 35.40061899 kilometers per liter.

How to convert gallons (imperial) per 100 miles to kilometers per liter

Converting gallons (imperial) per 100 miles to kilometers per liter is not a simple multiplication, so use the formula below.

kilometers per liter = 35.40061899 ÷ gallons (imperial) per 100 miles

Example: 10 gallons (imperial) per 100 miles = 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

Gallon (imperial) Per 100 Miles (gal/100 mi (UK))

Imperial (British)Current unit

Imperial gallons used per 100 miles.

Most fuel-economy figures rise when a car gets better, which is why miles per gallon can mislead: going from 10 to 20 miles per gallon saves far more fuel than going from 50 to 60. Quoting consumption per fixed distance avoids that trap, and the United States adopted the idea on its fuel-economy window stickers, which show US gallons per 100 miles. Using imperial gallons of 4.54609 liters gives a British-flavored variant of the same idea, equivalent in spirit to liters per 100 kilometers.

Because lower numbers mean better efficiency, the relationship with distance-per-volume units is a reciprocal. In this converter, kilometers per liter equals 35.4006 divided by the number of imperial gallons per 100 miles, since 100 miles is 160.9344 kilometers and a gallon is 4.54609 liters. For example, 5 gallons per 100 miles is about 7.08 kilometers per liter, or 20 miles per imperial gallon. The unit is rare in practice, and the British continue to rely on miles per imperial gallon alongside liters per 100 kilometers.

1 gallon (imperial) per 100 miles = 35.40061899 kilometers per liter (approximately).

Sources: Wikipedia: Fuel economy in automobiles; NIST SP 811, Appendix B.8 conversion factors

Kilometer Per Liter (km/L)

Metric (SI)Current unit

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

See all fuel economy units.