[astazangasta]

How about the cost of manufacturing a car, which has a cost in fuel? Also, most of the cost of food is labor for its preparation. You're paying for a lot more than just calories. Food is not made to be energy dense like gasoline, it's made to be tasty and nutritious.

[martin_henk]

Exactly... If you would include the manufacturing/r&d/transport, walking probably would be the most efficient way if looking at just one mile