In addition, the fuel that goes into a car is this ultra-refined blend of chemicals that is produced in a refinery. You have to extract oil from the ground, ship it to a refinery, use heat and various additives to transform it into automobile fuel, then ship it to a service station. I would imagine that the process of refining oil into gasoline is probably not 20% efficient.
Your body works on stuff that literally grows on trees. If you have a back yard, or even a decently sunny balcony, you can grow a tomato plant. Then, you eat that tomato, and voila, bike fuel. So, even if the calorie efficiency of a human body converting food into fuel isn’t great, the human body is the refinery. It can theoretically even be fuelled by foraging, no crops necessary.
In addition, the fuel that goes into a car is this ultra-refined blend of chemicals that is produced in a refinery. You have to extract oil from the ground, ship it to a refinery, use heat and various additives to transform it into automobile fuel, then ship it to a service station. I would imagine that the process of refining oil into gasoline is probably not 20% efficient.
Your body works on stuff that literally grows on trees. If you have a back yard, or even a decently sunny balcony, you can grow a tomato plant. Then, you eat that tomato, and voila, bike fuel. So, even if the calorie efficiency of a human body converting food into fuel isn’t great, the human body is the refinery. It can theoretically even be fuelled by foraging, no crops necessary.