It's an extremely convenient metric. L/100km is roughly equivalent to L/h at highway speeds, and you can figure Litres to destination when you see a road sign

It's an extremely convenient metric. L/100km is roughly equivalent to L/h at highway speeds, and you can figure Litres to destination when you see a road sign by multiplying L/100km by the hundreds place. With gas stations being upwards of a hundred kilometres apart in the prairies and northern ontario, especially at night, it's nice that this is so easy.