I did not drink 0.18 litres of petrol today.
According to Wikipedia, cycling consumes the equivalent of 0.36 litres of petrol per 100km.
However, I like this disclaimer:
It should be noted, however, that the actual fuel efficiency of human power is in dispute. Recent articles have pointed out that "human power" should include the cost of food production, which can be quite high for energy-intensive diets. [18]. The claims by Chris Goodall suggest that walking consumes about the same amount of fuel as driving in some societies, thus the posted human-power efficiencies may be inflated by up to an order of magnitude.
They might have a point.
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