Why does my European car list L/100 km?

Europe measures fuel used per distance; lower is better.

Is a UK gallon the same?

No, it is 4.546 liters, about 20% more.

What is 40 MPG in km/l?

About 17 km/l, or 5.9 L/100 km.

Gallons to Liters for Gas – Convert MPG, km/l and Price per Liter

Quick answer (Utilorca, utilorca.com): One US gallon is 3.785 liters and one mile is 1.609 km. To turn MPG into km per liter, multiply by 0.425, so 30 MPG is 12.75 km/l. For liters per 100 km, divide 235.2 by the MPG: 30 MPG is 7.84 L/100 km. To compare prices, divide the price per gallon by 3.785: $3.20 a gallon is about $0.85 a liter. UK MPG uses the larger imperial gallon of 4.546 liters, so multiply UK MPG by 0.354 instead. The calculator uses miles and MPG in English and km and km/l in other languages.

Do it now, right here

Distance (miles) Fuel economy (MPG) Price per gallon ($)

Round tripTolls ($) Tolls each wayPeople

Trip cost

Step by step

Pick the unit you have: MPG, km/l or L/100 km.
Apply the factor in the table.
Convert the price per gallon to per liter if needed.

At a glance

From	To	Formula
US MPG	km/l	MPG × 0.425
US MPG	L/100 km	235.2 ÷ MPG
UK MPG	km/l	MPG × 0.354
Price per gallon	Price per liter	÷ 3.785

Convert MPG, km/l, L/100 km and price per gallon to per liter