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PowerPedia:l/100 km

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Fuel economy is usually expressed in the amount of fuel used per unit distance; for example, litres per 100 kilometres (L/100 km). In this case, the lower the value, the more economic a vehicle is (the less fuel it needs to travel a certain distance)

The formula for converting miles per US gallon (3.785 L) to L/100 km is $\frac{235.2}{x}$ , where $x$ is the miles per gallon number. For miles per Imperial gallon (4.546 L) the formula is $\frac{282.5}{x}$ .

In Europe, the two standard measuring cycles for "L/100 km" value are motorway travel at 90 km/h and rush hour city traffic. A reasonably modern European supermini may manage motorway travel at 5 L/100 km (47 mpg US) or 6.5 L/100 km in city traffic (36 mpg US), with carbon dioxide emissions of around 140 g/km.

I.e. an average North American mid-size car travels 9 L/100 km highway, 11 L/100 km city

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